St. Louis homeowners know that entry and exterior doors take a beating. The freeze-thaw cycles of our cold winters, combined with the humidity and spring thunderstorms typical of the Midwest, create real weather pressure on door frames, thresholds, and seals. Whether your door frame is rotting from moisture exposure, your threshold has settled unevenly, or you simply need a new door installed weather-tight and properly flashed, Exterior & Entry Door Installation in St. Louis requires carpentry work that stops water infiltration and holds up to our climate. We repair rotted frames and thresholds when the wood justifies it, or we replace the full unit with proper flashing, insulation, and secure fastening. From Victorian mansions in Lafayette Square to brick bungalows on The Hill and the classic St. Louis flats across South City, we install and repair doors that keep the weather out and the comfort in.
Why Exterior & Entry Door Installation Matters in St. Louis's Brick and Frame Climate
St. Louis is a brick city, but wood shows up where it counts: in door frames, trim, and the structural elements around every entry point. When water gets behind a door frame or settles on a threshold, rot develops quickly in our humid continental climate. A rotted door frame doesn't just look bad, it allows drafts, moisture, and pest entry into the home. Proper installation means flashing that directs water away from the frame, insulation that stops thermal loss, and fastening that holds against wind-driven rain. Getting this right the first time saves money on water damage repair later.
- We inspect the existing frame and sill for wood rot, settlement, and moisture damage before proposing repair or replacement.
- We flash and seal all new door installations to shed water and prevent infiltration during heavy rain and snow melt.
- We set doors plumb and square so they close smoothly and seal evenly against weather.
- We insulate the rough opening to reduce thermal loss and prevent condensation inside the frame.
A properly installed door is an investment in comfort, energy efficiency, and protection against the water damage and pest entry that plague St. Louis homes.
Key info: Rotted door frames are common in South City brick flats and Tower Grove rowhouses, where exterior wood trim is exposed to decades of freeze-thaw cycles. We repair sound frames and replace frames where rot has compromised structural integrity. See our wood rot repair page for details on identifying and addressing rot before it spreads.
For permit questions on exterior door replacement in St. Louis, contact the City of St. Louis Building Division. Most standard door replacements don't require a permit, but structural alterations to load-bearing openings do.
How We Install and Repair Exterior Doors: Our Process in St. Louis
We approach every door job the same way: measure twice, assess the existing condition, and install or repair for long-term weather resistance. If the frame has minor rot in the sill or side jamb, we often repair it by sistering in new wood or replacing just the damaged section. If rot has compromised the structural integrity of the frame, we remove and replace the entire unit. Every installation gets proper flashing, shims, insulation, and fastening to stand up to St. Louis weather.
- We remove the existing door (if replacing) and inspect the rough opening, sill, and framing for rot, water damage, and settlement.
- We repair or replace rotted framing, sistering new wood to sound structure or cutting out and replacing damaged sections.
- We install flashing at the threshold and sides to direct water away from the frame and into the exterior.
- We set the new door frame plumb and square, shimming and fastening it securely to the rough opening.
- We insulate the gap between the frame and the rough opening to minimize thermal loss and prevent condensation.
- We hang and adjust the door so it closes smoothly, seals evenly, and latches securely.
- We finish trim and casing to match the interior and exterior aesthetic of your home.
This systematic approach prevents callbacks and ensures your door performs through St. Louis winters and humid summers.
Real example: A homeowner in Kirkwood had a French door with a rotted sill and water staining on the interior drywall. Rather than replace the entire unit, we removed the door, cut out and sistered in new sill stock, installed new flashing, and rehung the original door. The repair cost a fraction of replacement and the door has stayed dry through two winters. That's the repair-first approach we apply whenever the wood justifies it.
Exterior & Entry Door Installation Approaches: Repair vs. Replacement
| Approach | Description | Best for |
|---|---|---|
| Sill or Jamb Repair | Remove the door, cut out rotted wood, sister or patch in new material, reinstall flashing and door. | Localized rot in one section of the frame; sound structure elsewhere; original doors worth preserving. |
| Full Frame Replacement | Remove the entire frame and door, install new pre-hung or custom unit with proper flashing and insulation. | Extensive rot throughout the frame; structural compromise; severe settlement; energy upgrade desired. |
| Threshold Repair | Replace only the threshold or sill component while retaining the existing jambs and door. | Rotted threshold with sound jambs; water infiltration at the base; minimal structural damage. |
| Flashing and Seal Upgrade | Keep the existing door and frame, remove and replace flashing, re-seal gaps, insulate the opening. | Door and frame structurally sound but leaking; poor original flashing; air infiltration; draft issues. |
Exterior & Entry Door Installation Cost in St. Louis: What to Expect
Exterior & Entry Door Installation cost in St. Louis typically starts at $850 for a straightforward threshold or sill repair on an existing frame, and ranges up to $2,500 or more for a full frame replacement with a new pre-hung door, flashing, and trim. The main factors that move the price are the extent of rot or damage, whether you're repairing or replacing the full unit, the type and quality of the new door (if needed), and the complexity of matching existing trim and casing. A door that's settled or out of square may require additional shimming and framing work. Access to the opening, whether it's at grade level or elevated, also affects the labor time.
We always recommend getting two or three estimates from local carpenters so you can compare scope, materials, and price. Our estimate is free and includes a detailed walkthrough of what we find and what we recommend. Visit our pricing page for more context on how we structure our estimates, or call us at (314) 338-6837 for a no-obligation consultation.
What to Look for When Hiring an Exterior & Entry Door Installation Carpenter Near Me in St. Louis
Choosing the right carpenter for your door installation means checking credentials, understanding the scope, and making sure the contractor will be there to back up the work. Look for a local carpenter who is fully insured and has been in business long enough to know St. Louis building practices and climate challenges. Ask for references from recent projects, especially if they've worked on homes similar to yours. Get the estimate in writing so you understand what's included: materials, labor, flashing, insulation, trim, and any repairs to the existing frame. If your home is in a historic district or subject to HOA rules, confirm that the carpenter is familiar with those requirements before you book.
We've been serving St. Louis and surrounding areas since 2016, and we hold a City of St. Louis Construction Industry Contractor License. We're fully insured and we stand behind every door installation we complete. Contact us today for a free estimate, or call (314) 338-6837 to discuss your specific door project and get a timeline.
Exterior & Entry Door Installation in St. Louis: Pricing Guide
| Service | Price | Details |
|---|---|---|
| Threshold or Sill Repair | Starting at $850 | Localized rot repair, new flashing, threshold replacement, door rehang and adjustment included |
| Full Door Frame Replacement | Starting at $1,400 | New pre-hung door unit, flashing, insulation, trim, casing, and installation labor for standard openings |
| Flashing and Seal Upgrade | Starting at $600 | Remove and replace flashing, re-seal gaps, insulate opening, address air infiltration on existing frame |
| Complex or Structural Repair | On estimate | Extensive rot, settlement, load-bearing alterations, or multiple-door projects require on-site assessment |
| Travel | Included | No separate mileage or call-out fee for St. Louis and surrounding service areas |
| Free Estimate | No obligation | Response within 24 hours at (314) 338-6837, detailed written scope and pricing before any work begins |
Indicative pricing, the exact cost depends on square footage, finish, and site access. Free personalized estimate within 24h at (314) 338-6837.
