Framing & Structural Carpentry in St. Louis means building and repairing the wooden skeleton that holds up your home. St. Louis is a brick city, and that brick skin sits on wood framing underneath: floor joists, rim joists, sill plates, studs, headers, and beams that carry load. When water gets in from a leak, when freeze-thaw cycles crack mortar and let moisture through, or when termites damage wood during humid summers, that framing weakens. New interior walls, garage and basement build-outs, wall openings, and repairs to fire- or water-damaged framing all require straight, plumb, code-compliant work. The bones have to be right, because everything else, your drywall, your trim, your doors and stairs, depends on them.
Why Structural Framing Matters in St. Louis: Water, Termites, and Time
St. Louis humidity and spring thunderstorms put constant pressure on wood. Brick and limestone are durable, but wood framing behind those walls absorbs moisture. Termites thrive in the humid months and can damage floor joists and rim joists before you see it. Settling, freeze-thaw cycles, and decades of seasonal movement all add stress to framing members. A sagging floor, a bowed wall, or soft spots in a joist aren't cosmetic problems: they signal that the structural system is losing capacity and needs repair or replacement soon.
- We inspect framing for rot, termite damage, and movement to understand what is safe and what must be replaced.
- We sister new lumber to weakened joists and beams to restore load-bearing capacity without unnecessary full replacement.
- We build new walls, openings, and basement build-outs plumb and square so your finish work sits on solid bone.
- We work from your own pest inspection report and repair or replace wood damaged by termites, but we do not perform pest treatment or extermination.
- We help you document structural damage for insurance claims if a fire, flood, or other event has harmed the frame.
Addressing framing problems early keeps small issues from becoming expensive replacements and keeps your home structurally sound for decades.
Key info: A Lafayette Square Victorian or a brick bungalow on The Hill may have 100+ years of wood framing underneath. Moisture intrusion through old mortar joints and freeze-thaw damage are the leading causes of rot and joist failure in St. Louis. We repair and replace strategically, not by demolition.
For more detail on water-related damage, see our page on Wood Rot & Dry Rot Repair, and for termite-damaged wood, visit Termite Damage Repair. If you suspect foundation or structural movement, the City of St. Louis Building Division can advise on whether a structural engineer is required for your project. Beam replacement and load-bearing wall alterations commonly require a licensed structural engineer and a permit. See Beam Replacement & Load-Bearing Wall Removal for details on those services.
How We Approach Framing & Structural Carpentry in St. Louis
Structural work starts with a careful look. We examine the damage, check for rot or insect activity, measure deflection, and assess whether the wood can be repaired or must be replaced. We explain what we find and what it will cost to fix. If a joist or beam is weakened but still sound, we sister new lumber alongside it to restore capacity. If wood is too far gone, we replace it. For new framing, we build plumb, square, and to code so your drywall, doors, and trim have a solid foundation.
- We visit your home, inspect the framing, identify damage, and take measurements.
- We explain the pathology, the risk if left alone, and your repair or replacement options.
- We provide a detailed estimate that covers materials, labor, and any required permits.
- We schedule the work and complete it with the same carpenters who gave you the estimate, not a rotating crew.
- We clean up and leave your home ready for the next trade or for occupancy.
This methodical approach means no surprises and work that passes inspection the first time.
Example: A homeowner in Kirkwood noticed their kitchen floor sloping toward the exterior wall. We found three floor joists with rot where water had wicked up from a failed sill plate. Rather than tear out the floor and replace all three joists, we sistered new pressure-treated lumber alongside the damaged ones, sealed the sill plate, and improved drainage outside. The floor is now level and solid, and the repair cost a fraction of full joist replacement.
For finish work that depends on good framing, see our Finish & Trim Carpentry service page. For floor-specific repairs, visit Floor Joist & Subfloor Repair.
Framing & Structural Carpentry Methods
| Approach | Description | Best for |
|---|---|---|
| Sistering | Installing new lumber alongside a weakened joist, beam, or stud, bolted or screwed tight to share the load. | Partially damaged joists or beams where the wood is still structurally sound enough to bond with the sister member. |
| Full Member Replacement | Removing a damaged joist, beam, or stud and installing new lumber of the same or greater dimension and grade. | Joists or beams too far gone to repair, or where sistering is not structurally adequate or practical. |
| New Wall Framing | Building partition walls, load-bearing walls, or structural openings from scratch, with proper headers and blocking. | Interior remodels, basement build-outs, garage conversions, and structural alterations that require a permit. |
| Sill Plate & Rim Joist Repair | Replacing rotted sill plates and rim joists at the foundation line, the most common failure point in St. Louis homes. | Water-damaged framing at the base of exterior walls, especially in older brick homes where mortar has failed. |
| Fire & Water Damage Framing | Assessing and replacing framing damaged by fire, flood, or severe moisture intrusion, with documentation for insurance. | Emergency repairs after a fire, flood, or major leak, where structural integrity and safety are at immediate risk. |
Each method is chosen based on the extent of damage, the load the member carries, and whether repair or replacement makes the most sense for your home and budget.
Framing & Structural Carpentry Cost in St. Louis: What to Expect
Structural framing work varies widely because every home and every damage pattern is different. A sistered joist or rim joist repair may start around $2,500 to $4,000, depending on access, the number of members affected, and whether the foundation or sill plate also needs work. Full joist or beam replacement, new wall framing, or a basement build-out will cost more because they involve more lumber, labor, and often a permit. Large projects or alterations to load-bearing walls can run $8,000 to $20,000 or more.
The main factors that move the price are the extent of damage, the size and length of the members being replaced, whether you can access the work easily, and whether a permit is required. Water-damaged framing in a crawlspace or basement is easier to reach than rot in a joist under a finished floor. Sistering costs less than full replacement because you are not removing the old member. A new wall in an open basement is faster than framing around existing plumbing or electrical.
We recommend getting 2 to 3 estimates before deciding. Each carpenter will assess the damage differently, and the price will reflect their approach. Some may recommend full replacement where sistering would work; others may underestimate the scope. A detailed estimate from a local contractor who has seen St. Louis framing problems will save you money and headache.
For a full pricing breakdown and examples of common jobs, visit our pricing page. Call (314) 338-6837 for a free estimate with no obligation.
Framing & Structural Carpentry Near Me: What St. Louis Homeowners Should Know When Hiring a Carpenter
Hiring the right carpenter for structural work is critical. Look for someone who is fully insured and can show proof of coverage. Ask for references from recent jobs and call them to ask about the quality of the work and whether the carpenter showed up on time and cleaned up. Check whether the carpenter has experience with St. Louis homes, brick construction, and the moisture and termite issues common here. Ask whether they pull permits and work with the city building department, because structural work often requires an inspection.
If your project involves removing or altering a load-bearing wall, replacing a major beam, or changing the structure significantly, a licensed structural engineer may be required to size the new members and provide engineered drawings. The City of St. Louis Building Division can tell you whether your specific project needs an engineer. Always check with your local building department before starting, and budget for a permit if one is required.
If you live in a historic district (like Lafayette Square, Compton Heights, or The Hill), or if your HOA has rules about structural work, ask about those restrictions before you hire. Some projects may need approval from a historic preservation board or HOA review. A carpenter who knows the local rules will save you delays.
Get your estimate in writing, with a clear scope of work, materials, timeline, and total price. If the estimate seems too low, ask why. If it seems too high, get another opinion. The cheapest bid is not always the best value if the carpenter cuts corners or leaves you with callbacks.
Ready to move forward? Contact us for a free, no-obligation estimate. We serve St. Louis, Clayton, University City, Webster Groves, Kirkwood, and surrounding areas. Call (314) 338-6837 or fill out the contact form, and we will respond within 24 hours.
Framing & Structural Carpentry in St. Louis: Pricing Guide
| Service | Price | Details |
|---|---|---|
| Floor joist or rim joist repair (sistering) | Starting at $2,500 | New lumber sistered to one or two joists, including fastening, sill plate sealing, and basic drainage improvement. |
| Full joist or beam replacement | Starting at $4,500 | Removal of damaged member and installation of new pressure-treated or dimensional lumber, plus temporary support and shoring. |
| New wall framing or basement build-out | Starting at $6,500 | New partition or load-bearing wall, including studs, headers, blocking, and plumbing or electrical rough-in coordination. |
| Large structural repair or multi-member replacement | On estimate | Projects involving multiple joists, beams, sill plates, or load-bearing wall removal require site inspection and detailed scope. |
| Travel and estimate | Included in St. Louis area | No mileage fee or call-out charge; free estimate within 24 hours at (314) 338-6837. |
Indicative pricing, the exact cost depends on square footage, finish, and site access. Free personalized estimate within 24h at (314) 338-6837.
