Comprehensive Guide to Weatherproofing Exterior Doors: Tools, Costs, and Seasonal Maintenance

Introduction: Why Weatherproofing Exterior Doors Matters

When it comes to home improvement, weatherproofing your exterior doors is one of the most cost-effective ways to enhance comfort, energy efficiency, and protection from the elements. Many homeowners underestimate how much conditioned air escapes—or how much moisture enters—through poorly sealed doors. Over time, these small gaps can lead to significant energy loss, higher utility bills, and even damage to floors and framing. Whether you live in a region with bitter winters, heavy rains, or sweltering summers, investing in proper weatherproofing pays off year-round. In this guide, you’ll find an expert breakdown of weatherproofing strategies, the essential tools required, a transparent cost analysis, and a detailed seasonal maintenance checklist. By the end, you’ll have actionable steps to ensure your home’s entryways remain resilient and efficient, no matter what the weather throws your way.

Understanding the Risks of Poorly Sealed Exterior Doors

Energy Loss and Increased Utility Costs

Gaps and cracks around exterior doors can account for up to 20% of your home’s heating and cooling losses. Unsealed thresholds or worn weatherstripping allow drafts to enter, forcing your HVAC system to work overtime. Over a year, this inefficiency can translate into hundreds of dollars in avoidable energy expenses.

Water Damage and Mold Growth

Rain-driven moisture can seep through unprotected door perimeters, especially during storms. This infiltration may lead to rotting subfloors, warped frames, and even the growth of mold or mildew—problems that are expensive and difficult to remedy after the fact.

Pest Intrusion

Small openings serve as entry points for insects and rodents. Once inside, these pests can cause additional damage and compromise your home’s hygiene and safety.

Essential Tools and Materials for Door Weatherproofing

  • Measuring tape: For accurate measurement of gaps and door dimensions.
  • Utility knife or scissors: To trim weatherstripping and door sweeps to fit.
  • Caulking gun and exterior-grade caulk: For sealing gaps in door frames or trim.
  • Screwdriver or drill: For removing/installing door hardware and sweeps.
  • Hammer and finishing nails: For securing new thresholds or trim.
  • Putty knife: To remove old caulk or paint.
  • Weatherstripping: Self-adhesive foam, V-strip, or rubber types, depending on door style.
  • Door sweep: Attaches to the bottom of the door to block drafts and water.
  • Threshold (optional): For doors with worn or missing thresholds.
  • Safety gloves and goggles: For personal protection while working.

Cost Breakdown: What to Expect

Material Costs

  • Weatherstripping: $8–$25 per door, depending on material and length.
  • Door sweep: $10–$30 each.
  • Threshold: $15–$50 (if replacement is needed).
  • Caulk (exterior-grade): $5–$8 per tube.
  • Miscellaneous tools (if not already owned): $20–$60 (one-time investment).

Professional Installation vs. DIY

  • DIY Total (per door): $25–$80, depending on condition and material choices.
  • Professional Service: $100–$250 per door, including labor and materials.

DIY weatherproofing is well within reach for most homeowners and offers substantial cost savings, especially if you’re tackling multiple doors.

Step-by-Step Guide to Weatherproofing Exterior Doors

1. Inspect and Measure

  • Check for visible gaps around the door perimeter, focusing on the bottom, sides, and top.
  • Look for daylight shining through, signs of moisture, or drafts.
  • Measure the width and length of gaps to determine the weatherstripping type and size required.

2. Remove Old Weatherstripping and Clean Surfaces

  • Peel away any worn or damaged weatherstripping.
  • Scrape off residual adhesive and old caulk using a putty knife.
  • Clean the area with a damp cloth and allow it to dry completely.

3. Apply New Weatherstripping

  • Cut the weatherstripping to the correct lengths for each side of the door.
  • Peel off the backing (for self-adhesive types) and press firmly into place along the door’s frame.
  • For nail-on types, use finishing nails to secure the strip, ensuring a snug fit without interfering with door operation.

4. Install or Replace the Door Sweep

  • Remove the old sweep (usually attached with screws at the bottom edge of the door).
  • Trim the new sweep to fit the door width.
  • Screw or slide the sweep into place, ensuring it just touches the threshold without causing friction.

5. Inspect and Replace the Threshold (If Necessary)

  • Check for rot, warping, or missing pieces on the existing threshold.
  • If replacement is needed, remove the old threshold and clean the area thoroughly.
  • Fit the new threshold, ensuring a tight seal with the bottom of the closed door, and secure it with screws or nails.

6. Caulk Around the Door Frame

  • Run a bead of exterior-grade caulk along joints where the frame meets the exterior wall.
  • Smooth the caulk with a wet finger or caulk tool for a neat finish.
  • Allow the caulk to cure according to manufacturer instructions before exposing to moisture.

7. Test for Leaks

  • Close the door and check for drafts using a lit incense stick, candle, or by feeling with your hand.
  • Re-adjust weatherstripping or sweep if necessary for a tighter seal.

Seasonal Maintenance Checklist for Exterior Door Weatherproofing

Spring

  • Inspect for mold, mildew, or water stains from winter storms.
  • Replace any swollen or damaged weatherstripping.
  • Touch up caulk and paint as needed to prevent moisture intrusion.

Summer

  • Check for loose weatherstripping caused by heat expansion.
  • Clean and lubricate door hinges and locks.
  • Inspect for insect activity and seal any new gaps.

Autumn

  • Thoroughly inspect all exterior doors before cold weather sets in.
  • Replace worn sweeps and add fresh weatherstripping if needed.
  • Ensure thresholds are intact and properly sealed.

Winter

  • Monitor for drafts and ice buildup around doors.
  • Remove snow and standing water from thresholds to prevent rot.
  • Address any urgent caulking issues before freeze-thaw cycles cause further damage.

Common Mistakes to Avoid

  • Using the Wrong Weatherstripping: Not all types are suitable for every door. Foam may compress too much, while metal V-strips may not fit all frames.
  • Neglecting the Threshold: Even with perfect weatherstripping, a damaged threshold lets air and water in.
  • Poor Surface Preparation: Failing to remove old adhesive or caulk can prevent new materials from adhering properly.
  • Over-tightening Door Sweeps: If the sweep presses too hard, it can make the door hard to open and cause premature wear.
  • Ignoring Regular Maintenance: Weatherstripping and caulk degrade over time and need to be checked seasonally.

Advanced Tips for Enhanced Protection

  • Consider a Storm Door: Adding a storm door provides an extra barrier against harsh weather and improves insulation.
  • Upgrade to Insulated Doors: Modern insulated doors offer better thermal performance and may qualify for energy efficiency rebates.
  • Automated Door Bottoms: For high-traffic or luxury applications, automated door bottoms drop a seal into place when the door closes.
  • Smart Sensors: Install door sensors to monitor for drafts or moisture intrusion, giving you real-time alerts to potential issues.

Conclusion: The Long-Term Value of Proper Door Weatherproofing

Weatherproofing your exterior doors is a home improvement project that delivers immediate and lasting benefits. With a modest investment in materials and a few hours of work, you can significantly reduce energy waste, protect your home from water damage, and block unwanted pests. The process is straightforward with the right tools and preparation, and regular seasonal maintenance ensures your efforts continue to pay off year after year. Avoid common mistakes by selecting the appropriate materials for your specific door style and climate, and always address issues promptly to prevent minor problems from becoming major repairs.

Beyond energy savings and comfort, well-sealed doors contribute to the longevity of your home’s structure and finishes. Whether you’re preparing for winter chills, summer heat, or the unpredictability of spring and autumn storms, proactive weatherproofing is a smart move for any homeowner. Start with a thorough inspection, gather the right tools, and follow the step-by-step methods outlined in this guide. Your home—and your wallet—will thank you for it.

74 thoughts on “Comprehensive Guide to Weatherproofing Exterior Doors: Tools, Costs, and Seasonal Maintenance

  1. I noticed you mentioned seasonal maintenance—how often should homeowners inspect and potentially replace weatherstripping or other seals to maintain optimal energy efficiency throughout the year?

    1. Homeowners should inspect weatherstripping and seals at least twice a year, ideally in the spring and fall. Look for cracks, gaps, or signs of wear that could let in drafts. If you notice any damage or reduced flexibility, it’s a good idea to replace them right away to keep energy efficiency high. Regular checks help catch problems before they affect your comfort or utility bills.

  2. About the cost analysis mentioned—could you give a ballpark figure on how much a DIY weatherproofing project typically runs compared to hiring a professional? I’m trying to plan next season’s maintenance budget.

    1. For a DIY weatherproofing project, you can expect to spend around $30 to $100, depending on the quality and quantity of materials like weatherstripping, door sweeps, and sealants. Hiring a professional usually costs between $150 and $400, factoring in labor and materials. DIY is much more budget-friendly if you’re comfortable doing the work yourself.

  3. If I already have some weatherstripping in place but still notice drafts around my exterior door, should I replace the entire strip or just patch the damaged areas? The article mentions air leaks can cause a lot of energy loss, so I want to make sure I do it right.

    1. If you still feel drafts, it’s usually best to replace the entire weatherstripping rather than patching just the damaged spots. Over time, weatherstripping can wear down unevenly or lose its flexibility, making patching less effective. Removing the old strip and installing a new one ensures a proper seal along the whole door and helps prevent energy loss more reliably.

  4. When you mention the essential tools, is it worth investing in specialized tools for cutting or measuring, or are basic household items like kitchen scissors and a standard tape measure usually sufficient for DIY weatherproofing jobs?

    1. For most DIY weatherproofing projects, basic household items like scissors and a standard tape measure will work just fine, especially if you’re only doing a couple of doors. Specialized tools can make the job a bit easier and more precise if you plan on tackling multiple doors or want a highly professional finish, but they aren’t strictly necessary for standard home jobs.

  5. If someone has already noticed minor water damage or mold near an exterior door, is it necessary to address that before starting any new weatherproofing, or can you seal things up first and handle the repairs later?

    1. It’s important to address any existing water damage or mold before starting new weatherproofing. Sealing up the area without taking care of damage can trap moisture inside, which may make the problem worse over time. Clean up any mold thoroughly and repair damaged materials, then proceed with weatherproofing for the best results.

  6. Does the guide explain how long the average door weatherproofing project takes for someone doing it themselves? I’d love to know if this is a quick weekend task or something I need to set aside more time for.

    1. The guide mentions that most DIY door weatherproofing projects can be completed in a single weekend, depending on your experience and whether you’re doing basic tasks like adding weatherstripping and applying caulk. If you plan more advanced work, such as replacing thresholds or door sweeps, it might take a bit longer, but overall it’s designed to be a manageable weekend project.

  7. In situations where there’s visible water damage or mold near my exterior doorframe, should I handle weatherproofing myself, or is it best to get a professional to inspect first?

    1. If you see visible water damage or mold around your doorframe, it’s best to have a professional inspect the area before attempting weatherproofing yourself. Water damage and mold can indicate underlying structural issues or hidden moisture problems that may need specialized treatment. A professional can assess the extent of the damage, recommend the right repairs, and ensure the area is properly treated and sealed before any weatherproofing is done.

  8. I live in an area with extremely humid summers and mild winters. Are there specific types of weatherstripping or sealants that handle humidity better, or is the standard material recommended in the guide generally enough for most climates?

    1. In humid climates, it’s best to use weatherstripping materials like silicone, vinyl, or EPDM rubber, as they resist moisture and won’t degrade as quickly as felt or foam. The standard recommendations in the guide work for most climates, but opting for these moisture-resistant materials will provide better durability and protection against humidity in your area.

  9. Regarding pest intrusion, if small gaps keep reappearing even after weatherproofing, what troubleshooting steps or products would you recommend to make the seal last longer?

    1. If small gaps keep showing up, start by checking if the door and frame are warped or misaligned, as this can prevent seals from staying tight. Use a high-quality silicone or rubber weatherstripping, as these hold up better over time than foam. For recurring gaps at the door bottom, try a door sweep with an adjustable seal. Regularly inspect and replace worn parts, and consider using expanding foam for larger or irregular gaps to create a longer-lasting barrier against pests.

  10. Does weatherproofing an old, original wooden exterior door differ at all from sealing a newer fiberglass or steel door? Are there tools or materials you’d recommend just for wood versus other materials?

    1. Weatherproofing an old wooden door does differ from sealing newer fiberglass or steel doors. Wood can swell or shrink with moisture, so flexible weatherstripping, wood filler, and exterior-grade caulk are important. For wood, use products like silicone caulk and door sweeps designed for irregular surfaces. Fiberglass and steel doors are less prone to movement, so rigid weatherstripping and standard sealants usually work well. Always check the manufacturer’s recommendations for your specific door material.

  11. When you mention that gaps around doors can account for up to 20% of heating and cooling losses, how can I tell if my existing doors are a major culprit? Are there simple tests or signs I should look out for?

    1. To check if your doors are a source of energy loss, try the dollar bill test: close the door on a dollar bill and see if you can pull it out easily—if so, there’s likely a gap. You can also feel for drafts around the frame with your hand on a windy day or look for visible light coming through. Moisture or dirt buildup near the threshold can also be signs of leaks.

  12. Could you elaborate on the best way to identify if the weatherstripping or threshold on an exterior door needs to be replaced, versus just needing adjustment or resealing?

    1. To check if weatherstripping or the threshold needs replacement rather than just adjustment, look for visible cracks, brittleness, or sections that are coming loose—these usually mean replacement is needed. If the material looks intact but you’re still feeling drafts, try adjusting or resealing first. Close the door and look for light coming through gaps; if you see any, it might be an adjustment issue. If adjustments don’t solve the problem, then replacement is the best option.

  13. The guide says gaps can be responsible for up to 20% of heating and cooling losses. If I’ve already sealed my windows, would tackling my doors next have a noticeably bigger impact on my utility bills?

    1. Yes, after sealing your windows, addressing any gaps in your exterior doors can still make a noticeable difference in your home’s energy efficiency. Since doors are common sources of drafts and leaks, weatherproofing them can further reduce heating and cooling losses, potentially lowering your utility bills. While the exact savings depend on your home’s condition, many homeowners see improved comfort and reduced energy costs after sealing both windows and doors.

  14. What is a realistic budget for weatherproofing a standard front door if I plan to do it myself, factoring in all the tools and materials you listed?

    1. If you already have basic tools like a utility knife, hammer, and screwdriver, the main costs will be materials such as weatherstripping, a door sweep, caulk, and possibly a threshold—typically totaling $30 to $70. If you need to buy basic tools as well, add about $20 to $40. So, a realistic DIY budget is usually $50 to $110 for a standard front door.

  15. With seasonal maintenance in mind, are there particular times of year when it’s most important to check or replace weatherproofing, or should I be looking for specific signs of wear regardless of the season?

    1. It’s ideal to check your door’s weatherproofing in early fall and again in spring. These times help you get ready for temperature changes and potential wet weather. However, it’s wise to look for signs like drafts, cracking seals, or water leaks throughout the year, especially after storms or extreme temperature swings.

  16. If pests are already getting in around my door, should I focus on sealing gaps first or try pest control measures before starting any weatherproofing projects?

    1. It’s best to start by sealing the gaps around your door first. Closing off entry points will immediately help keep pests out and also improve your weatherproofing efforts. Once gaps are sealed, if you still notice pests, then consider specific pest control measures. Addressing the source of entry is usually the most effective first step.

  17. Could you explain a bit more about how to spot water damage or mold early around exterior doors? I want to catch any problems before they get expensive, but I’m not sure exactly what signs I should be looking for.

    1. To catch early water damage or mold around exterior doors, watch for signs like peeling or bubbling paint, soft or swollen wood, discoloration, or musty odors near the door frame and threshold. Also check for visible mold spots, persistent dampness, or warping. Gently press on suspect areas to feel for softness, which can indicate rot. Catching these issues early makes repairs much easier.

  18. Could you elaborate a bit on the typical price range for weatherproofing materials listed here? I’m trying to budget for a few doors and am wondering how costs might add up for an average home.

    1. For weatherproofing exterior doors, common materials like weatherstripping typically cost between $5 and $20 per door, while door sweeps are usually around $10 to $30 each. Caulk or sealant tubes run about $4 to $10. For an average home with three exterior doors, expect to spend roughly $60 to $150 in total, depending on the quality of materials you choose.

  19. Could you provide more specifics on how often the weatherproofing materials, like weatherstripping or door sweeps, typically need to be replaced in areas with frequent heavy rainfall? I’m curious about the real-world lifespan for homeowners in wetter climates.

    1. In wetter climates with frequent heavy rainfall, weatherstripping and door sweeps generally need to be replaced every 1 to 2 years. Moisture, temperature changes, and constant exposure can cause these materials to wear out faster than in drier areas. It’s a good idea to inspect them every 6 months for signs of cracking, peeling, or loss of flexibility, and replace them promptly if you notice deterioration.

  20. When calculating the total cost of weatherproofing an exterior door, does the guide account for both tools and materials or just materials? I’m trying to set a realistic budget for a couple of older doors.

    1. The guide includes both tools and materials in its cost estimates, aiming to give you a realistic picture of what you’ll spend. This approach helps when budgeting for older doors, especially if you need to buy new tools. If you already own some tools, you can adjust the total downward to reflect your situation.

  21. I noticed that water damage and mold growth are a risk for exterior doors that aren’t sealed well. Are there specific weatherproofing materials that work better in regions with a lot of rain versus places that are mainly windy or dry?

    1. Absolutely, the best weatherproofing materials do depend on your local climate. In rainy areas, high-quality silicone or polyurethane caulk and durable rubber or vinyl door sweeps are most effective for sealing out moisture. For windy or dry climates, weatherstripping made from foam or felt works well to block drafts. Always make sure the materials you choose are rated for exterior use and the specific conditions of your region.

  22. I’m new to weatherproofing, and my front door has a small gap at the bottom. The article mentions worn weatherstripping and unsealed thresholds—how can I tell if I need to replace weatherstripping or just adjust the threshold itself?

    1. To check if your weatherstripping needs replacing, look for cracks, flattening, or pieces that are coming loose. If it seems intact but there’s still a draft, try adjusting the threshold by tightening or loosening its screws. If adjusting the threshold doesn’t close the gap or stop drafts, it’s likely time to replace the weatherstripping.

  23. I run a small business out of my home, and I’m concerned about energy costs adding up. In the cost analysis section, do you factor in the difference between DIY and hiring a professional, and what scenarios might justify paying extra for pro help?

    1. The cost analysis section does break down expenses for both DIY and hiring a professional, highlighting where the main differences lie—especially in labor charges. If your exterior doors are unusually old, have structural damage, or you want a warranty on the work, it can be worth hiring a professional. For standard door weatherproofing, DIY is usually sufficient and more cost-effective.

  24. You mentioned that energy loss through door gaps can account for up to 20% of heating and cooling losses. Is there a quick way to test if my current door sealing is still effective, or do I need special tools for that?

    1. You can check your door sealing without any special tools. On a windy day, slowly pass your hand around the edges of the closed door to feel for drafts. Alternatively, try the flashlight test: have someone shine a flashlight from outside while you look for light leaking through gaps. If you notice air movement or light, it’s time to improve your weatherproofing.

  25. If an older door frame has minor warping, is weatherproofing still effective, or does it make sense to address structural issues first before installing new seals and weatherstripping?

    1. If your older door frame has minor warping, you can still improve weatherproofing with seals and weatherstripping, but you might not get a perfect seal. For best long-term results, it’s wise to address any structural issues first. Fixing the frame ensures a better fit for weatherproofing materials and improves overall energy efficiency.

  26. If I already notice some mold growth on the subfloor near my door, should I focus on weatherproofing right away, or address the existing damage first? The article talked about water damage being expensive to fix.

    1. It’s important to address the existing mold and any water damage before weatherproofing your door. Mold can spread quickly and lead to costly repairs, so make sure to properly clean and dry the affected area first. Once the damage is handled and the area is dry, you can then focus on weatherproofing to help prevent future issues.

  27. In terms of seasonal maintenance, is it necessary to redo all the steps every year, or can certain weatherproofing materials last for several seasons without needing to be replaced?

    1. You don’t always need to redo every weatherproofing step each year. Many materials, like quality door sweeps and silicone caulk, can last several seasons if they’re installed correctly and regularly inspected for wear. However, it’s important to check these components each season—if you notice cracking, gaps, or damage, then replacement or touch-ups are recommended to maintain their effectiveness.

  28. You mention that gaps around exterior doors can cause up to 20% of heating and cooling losses. Is there an easy way homeowners can identify the most problematic spots around their door frames before starting the weatherproofing process?

    1. Yes, a simple way to find gaps is to run your hand slowly around the door frame on a windy day or while the HVAC is running; you’ll feel drafts where air leaks in. Another method is to use a flashlight at night—have someone stand outside while you shine the light along the door’s edges from inside. Light shining through pinpoints the spots needing the most attention.

  29. For someone on a tight budget, what would you prioritize first: sealing gaps to address energy loss, or focusing on moisture barriers to prevent water damage and mold? Is one more urgent or cost-effective than the other?

    1. If you’re on a tight budget, start by sealing gaps to reduce energy loss. This is usually low-cost and can quickly make your home more comfortable while saving on energy bills. Addressing air leaks with weatherstripping or caulk is often more urgent and cost-effective. Moisture barriers are important too, but unless you’re noticing signs of water intrusion, tackling drafts should be your first step.

  30. I noticed you mention both energy loss and water damage as major risks of poorly sealed doors. Are there weatherproofing materials or techniques that are especially effective against moisture but also help with insulation, or do these usually require separate solutions?

    1. Many weatherproofing materials, like high-quality door sweeps and foam or rubber weatherstripping, are designed to handle both moisture and energy loss. These materials seal gaps to keep water out and also reduce drafts, improving insulation. For areas exposed to heavy rain, using a combination of a door bottom seal (to block moisture) and a foam weatherstrip (for insulation) works well without needing separate solutions.

  31. I see you listed some essential tools and materials for weatherproofing, but could you clarify if certain types of weatherstripping are better suited for heavy rain climates versus areas with mainly temperature swings?

    1. Absolutely! For areas with heavy rain, look for weatherstripping made from rubber or silicone, as these materials provide a tighter seal against moisture. Door sweeps with drip caps are also highly effective in wet climates. In regions where temperature swings are the main concern, foam or felt weatherstripping works well to block drafts and insulate but may not offer as much moisture resistance. Choosing the right material will help maximize protection based on your local conditions.

  32. I live in an area with cold winters and windy storms. Are there specific weatherproofing tools or techniques you’d recommend for preventing drafts and water intrusion during extreme weather?

    1. For cold, windy climates, consider using heavy-duty weatherstripping like adhesive foam tape or silicone strips around door frames to block drafts. Install a door sweep or draft stopper at the bottom to seal gaps. For extra protection, use a high-quality exterior-grade caulk to seal cracks around the frame, and check the threshold for tightness. Storm doors also add an extra barrier against wind and water intrusion during extreme weather.

  33. In the seasonal maintenance checklist you mentioned, how often should weatherstripping be replaced on exterior doors in areas with extreme weather changes? Also, are there signs I should look for that indicate immediate replacement is needed?

    1. In areas with extreme weather changes, it’s a good idea to check your weatherstripping at the start of each season and plan on replacing it every 1-2 years, or sooner if you notice issues. Signs that immediate replacement is needed include visible cracks, flattening, gaps letting in light or drafts, or if the weatherstripping is peeling away from the door frame.

  34. When it comes to the cost breakdown you mentioned, can you give an idea of how much a typical homeowner might expect to spend if they’re buying everything from scratch, versus just replacing worn-out weatherstripping?

    1. If you’re starting from scratch and need to buy all the tools and materials—like weatherstripping, caulking, door sweeps, a caulking gun, and basic hand tools—you might spend between $70 and $150. If you’re only replacing worn-out weatherstripping, the cost usually falls between $10 and $30, since you likely already have most tools on hand.

  35. If I start noticing mold or mildew near my exterior door, what steps should I take first to address the moisture before beginning any weatherproofing repairs?

    1. If you notice mold or mildew near your exterior door, begin by cleaning the affected area with a mixture of water and mild detergent, or a solution specifically designed to remove mold. Make sure to wear gloves and ensure good ventilation. Next, identify and address the source of moisture, such as leaks or gaps. Let the area dry completely before starting any weatherproofing repairs to prevent mold from returning.

  36. If my front door frame has some old water damage but the wood still feels solid, is it enough to replace the weatherstripping, or should I be worried about hidden mold or more serious issues before sealing it up?

    1. If the wood feels solid and shows no signs of crumbling or significant softness, replacing the weatherstripping can help improve your door’s seal. However, water damage can sometimes hide mold or rot beneath the surface. It’s a good idea to carefully inspect the area for any discoloration, musty smells, or softness. If you notice any of these or if the damage seems extensive, consider having a professional check for hidden issues before sealing everything up.

  37. I noticed you included a transparent cost analysis. For someone with multiple exterior doors, how much should I budget per door on average for materials if I want reliable, long-term weatherproofing?

    1. For reliable, long-term weatherproofing materials, you should budget about $40 to $90 per exterior door. This covers quality weatherstripping, a durable door sweep, and a tube or two of sealant. If your doors need threshold replacement, add $20–$50 per door. Buying in bulk for multiple doors may also help lower the per-door cost slightly.

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