Roof Replacement in St. Louis, MO
Roof replacement St. Louis homeowners can trust is a full tear-off, not a layover.
Twin Rivers Contracting LLC removes the old roof down to the deck, repairs damaged decking, and installs new underlayment, flashing and shingles to manufacturer specifications on every roof replacement. We replace asphalt shingle, architectural shingle, metal and flat roofs on St. Louis homes and businesses. A free roof inspection tells you whether you need a roof replacement or a repair, and the roof replacement estimate is always in writing. Financing is available for roof replacement throughout St. Louis City, St. Louis County, St. Charles County and Jefferson County.
Call (636) 541-2687.
Roof replacement in St. Louis
A roof replacement is the right call when damage is spread across the roof, leaks keep coming back after repairs, or the shingles are worn out. Roof replacement in St. Louis also has a code side. Local building codes here are based on the International Residential Code, which doesn't allow new shingles over a roof that already has two layers or over one that's water-soaked or deteriorated. That's one reason our roof replacement is always a tear-off. If a fix in one spot would do, our St. Louis roofing team will say so and point you to roof repairs in St. Louis instead.
Should a 20-year-old roof be replaced?
Not because of the number alone. Replace a 20-year-old roof when it shows the wear:
- Shingles curling, cracking or lifting
- Bare spots where the granules have washed off
- Soft spots in the decking underfoot
- Leaks that come back after each repair
One money reason to look sooner: many policies pay older roofs at actual cash value, which subtracts depreciation, so a storm claim may pay well short of a new roof.
What is the 25% rule for roofing?
The 25% rule for roofing says that if more than 25% of a roof is repaired or replaced within 12 months, the entire roof must be replaced and brought up to current code. The 25% rule for roofing comes from the Florida Building Code. Is the 25% rule for roofing a Missouri rule? No. St. Louis roofing codes follow the International Residential Code, which has no 25% rule. The roofing rule that applies here is the layer limit in IRC Section R908.3.1.1, which bans a re-cover over two existing layers or over a water-soaked or deteriorated roof.
- Florida: the 25% rule for roofing applies under the Florida Building Code.
- Missouri: there is no statewide 25% rule for roofing.
- St. Louis City and County: IRC-based codes with a layer limit, not a percentage.
The 25% rule for roofing is why a partial repair in Florida can turn into a whole new roof. In St. Louis, the choice between roof repair and roof replacement comes down to condition, layers and matching shingles, not a 25% rule.
- Inspection
- Free, with photos
- Estimate
- Itemized, in writing
- Tear-off
- Down to the deck on every job
- Timeline
- Written into your estimate
- Warranty
- Written into your estimate
- Financing
- Available, subject to approval
How it works
- Free inspectionWe look at the whole roof, take photos and show you what we found. No charge and no obligation.
- Written estimateYou get the price and scope in writing before any work starts, with repair and replacement options when both make sense.
- The work, then cleanupOur crew does the job, cleans up the site and walks it with you. On storm jobs we work with your insurance adjuster.
How much does a new roof cost in St. Louis?
A new roof in St. Louis costs what its size, pitch, material and tear-off add up to, so the real number comes from measuring your roof. A new roof with architectural shingles costs more than one with basic three-tab shingles, and a new metal roof costs more than either. The roof replacement cost St. Louis homeowners pay depends on roof size in squares, roof pitch, material, tear-off layers and decking repairs. Get your exact new roof cost with a free roof inspection and written estimate from Twin Rivers Contracting LLC.
What is the average cost of a new roof in Missouri?
A statewide average blends ranch homes with two-story homes and three-tab shingles with metal, so it says little about your roof. Two numbers decide your new roof cost: how many squares the roof has (one square is 100 square feet of roof surface) and the installed price per square.
How much does it cost to replace a roof on a 1,200 or 2,000 sq ft house?
Turn the house size into roof size first. A one-story roof covers about the floor area; a two-story roof covers about half of it. Then multiply the flat footprint by the pitch factor:
- 4/12 pitch: × 1.05
- 6/12 pitch: × 1.12
- 8/12 pitch: × 1.20
- 12/12 pitch: × 1.41
| House | Roof footprint | At a 6/12 pitch | Squares |
|---|---|---|---|
| 1,200 sq ft, one story | 1,200 sq ft | 1,342 sq ft | About 13.5 |
| 2,000 sq ft, one story | 2,000 sq ft | 2,236 sq ft | About 22.5 |
| 2,000 sq ft, two story | 1,000 sq ft | 1,118 sq ft | About 11 |
Overhangs, porches and an attached garage add area. Multiply the squares by the price per square on your estimate, then add tear-off, decking and flashing.
Is $30,000 too much for a roof?
It depends on what the $30,000 buys. Divide the price by the number of squares to get a price per square, then compare estimates on that number for the same scope: same material, same layers torn off, same underlayment and flashing. An estimate that won't say how many squares it priced is the problem, not the total.
What is the most expensive part of replacing a roof?
On most shingle roofs, the biggest line is the roofing material and the labor to install it, priced per square across the whole roof. The lines that surprise people are decking and extra layers, because nobody sees them until tear-off.
| Line item | What it is | Why it moves the price |
|---|---|---|
| Squares | Roof area, in 100 sq ft units | Material and labor are priced per square |
| Pitch | How steep the roof is | Steep roofs need harnesses and more time per square |
| Tear-off layers | Old roofs removed to the deck | Each extra layer adds labor and disposal weight |
| Decking | Plywood or boards under the shingles | Soft sheets are replaced one by one, found at tear-off |
| Underlayment | Felt or synthetic, plus ice and water barrier | Coverage at eaves and valleys adds material |
| Flashing | Metal at chimneys, walls and skylights | Chimneys and skylights take hand work |
| Ventilation | Ridge and intake vents | Under-vented attics need new vents added |
| Permit | Set by your city or county | Fees and inspections vary by jurisdiction |
What is the cheapest month for roofing in St. Louis?
Late fall and winter are often the slowest months for roofers, so scheduling is easier then. Shingles need warmth to seal, so very cold days are avoided.
Get a free inspection and a written price
Tell us what's going on and we'll call you to set a time.
Does homeowners insurance pay for roof replacement in Missouri?
Homeowners insurance in Missouri pays for roof replacement when a covered event such as hail or wind damaged the roof badly enough to require replacement; it does not pay to replace a roof that wore out with age. You pay your deductible, and your policy decides whether the roof replacement is paid at replacement cost or actual cash value. Twin Rivers Contracting LLC documents roof damage and meets your insurance adjuster in the St. Louis area. Our guide to filing a hail claim in Missouri walks through the deductible math.
Can I finance a roof replacement in St. Louis?
Yes. You can finance a roof replacement in St. Louis through Twin Rivers Contracting LLC; financing is available on roof replacement projects, subject to approval. Roof replacement financing lets you replace a failing roof now instead of waiting for leaks to damage the decking and interior. Start with a free roof inspection and a written roof replacement estimate, then ask about financing.
How long does a roof replacement take?
A roof replacement takes a set number of working days that we write into your estimate before the roofing crew starts. Roof replacement time depends on roof size, roof pitch, weather and how much decking needs repair. Every roof replacement follows the same order:
- Protect the house, landscaping and driveway.
- Tear off the old roof down to the deck.
- Replace soft or rotted decking.
- Install underlayment, ice and water barrier, and flashing.
- Install the new shingles, ridge caps and vents.
- Clean up the yard and driveway, then walk the job with you.
How to choose a roof replacement contractor in St. Louis
- The estimate shows squares and layers. You can't compare the roof replacement cost St. Louis roofers quote without them.
- Decking is priced before tear-off. A per-sheet price keeps a soft deck from becoming an open-ended bill.
- They handle the permit and show proof of insurance. Missouri has no statewide roofing license, so rules are set locally.
Our written estimates cover all three, the same as on every job we take on. Not sure yet? Start with a free roof inspection and decide with photos in hand.
Do I need a permit to replace my roof in St. Louis?
Often yes, but it depends on where the house sits. The City of St. Louis runs its own building division. In St. Louis County the permit comes from your city or, in unincorporated areas and cities that contract with it, the County's Department of Transportation and Public Works.
A new roof and the rest of the exterior
Old gutters often come off with the old roof, and seamless gutter installation sized to the new roof finishes the job. After a storm, one crew can also handle siding replacement, replacement windows and new entry doors. Flat roofs on shops and offices fall under commercial flat-roof work, and garages and pole barns often get a ribbed steel metal roof instead of shingles.
Roof replacement across St. Louis
We replace roofs across the metro: St. Charles, O'Fallon and roofing in Wentzville in St. Charles County; Chesterfield, Ballwin and Kirkwood in St. Louis County; and Arnold and Jefferson County. Permit rules change at every one of those city lines. See all service areas.
Related services
- Roof RepairLeaks, shingles, flashing, pipe boots
- Emergency Roof RepairTarping and temporary repairs to stop the water
- Roof InspectionFree, photo-documented, priorities in writing
- Storm & Hail DamageHail and wind damage, documented for your claim
- Metal RoofingRibbed steel roofs and snow guard retrofits
- Commercial RoofingFlat and low-slope roofs for businesses
- GuttersSeamless aluminum gutters and downspouts
- Gutter Cleaning & GuardsGutter cleaning, guards and leak repairs
- SidingSiding replacement, repair, soffit and fascia
- WindowsEnergy-efficient replacement windows
- DoorsEntry, patio and storm doors
- Handyman ServicesDrywall, trim, caulking, fixtures, punch lists
- Holiday LightingChristmas lights and permanent house lighting
Ready when you are
Call (636) 541-2687, Monday–Friday 8 a.m.–6 p.m. and Saturday 9 a.m.–2 p.m., or send the form and we'll call you back.