Roofing · Williston, ND
How much does flat roof replacement cost in Williston, ND? (2026)
In Williston, flat roof replacement runs $4,950–$14,400, with most paying around $9,700 — about 3% below the national average. Replacing a flat or low-slope roof using membrane systems such as TPO, EPDM or modified bitumen.
Updated June 2026 · Localized estimate, not a quote
Most homeowners pay around $9,700
- Typical cost
- $9,700
- Labor vs US
- −14%
- Climate
- Cold
- Local permit
- $250
Refine your estimate
Tune it to your home to narrow the flat roof replacement range.
Key takeaways for Williston
- Most Williston homeowners land around $9,700 for flat roof replacement, within a $4,950–$14,400 range that sits about 3% below the national average.
- The −14% gap between Williston and national labor rates is the single biggest reason this price isn't the national average.
- The estimate already covers the Roofing permit — roughly $250 in Williston.
- A well-installed job here typically lasts 15–30 years — plan the next replacement instead of waiting for an emergency one.
- Time it right and you can save 5–10%: the best window to book is Late spring to early fall (dry, 45–85°F).
What goes into the price in Williston
A typical Williston flat roof replacement of $9,700 breaks down roughly like this — materials priced near the national level, labor set by local rates.
| Line item | Williston 2026 range |
|---|---|
| Materials & equipmentThe equipment and materials themselves — this part barely shifts by location. | $1,900 – $5,650 |
| Labor & installationInstall crew, removal and startup — the part local rates move most. | $2,800 – $8,500 |
| Permit & feesThe Roofing permit fee for this metro, based on local rates. | $250 |
| Total installed cost | $4,950 – $14,400 |
Split from the Williston estimate using a 60% local-labor share; line items sum to the total.
Why flat roof replacement costs what it does in Williston
- Williston's labor rates sit about 14% lower than the national average, pushing the price down.
- Because Williston sits in a cold climate zone, flat roof replacement costs run about 3% higher than a neutral-climate baseline.
- A Roofing permit in Williston costs around $250, included above.
Flat Roof Replacement cost by roof size in Williston
Flat and low-slope roofs are priced per square (100 sq ft) and run about $3–$11 per sq ft installed, depending on the membrane. The roof area is close to the footprint since there's little pitch.
| roof size | Williston 2026 range |
|---|---|
| 1,000 sq ft (10 squares) | $4,000 – $8,250 |
| 1,500 sq ft (15 squares) | $4,950 – $10,650 |
| 2,000 sq ft (20 squares) | $5,900 – $13,450 |
| 2,500 sq ft (25 squares) | $7,350 – $15,350 |
| 3,000+ sq ft (30 squares) | $8,750 – $18,200 |
National size ranges localized to Williston labor and climate.
Flat Roof Replacement cost by type in Williston
| EPDM (rubber) | $5,000 – $11,600 |
| TPO | $5,950 – $12,550 |
| PVC | $6,900 – $14,450 |
| Modified bitumen | $5,000 – $10,650 |
| Built-up roofing (BUR) | $6,400 – $13,500 |
Adjusted to Williston from national type-level ranges.
Flat Roof Replacement cost by efficiency in Williston
Flat roofs are defined by their membrane. EPDM (rubber) is the budget standard; TPO is the popular reflective 'cool roof' choice; PVC and modified bitumen suit grease or high-traffic settings.
| EPDM rubber membraneLowest-cost; durable black rubber; ~20–25 yr | $4,950 – $10,650 |
| TPO (reflective single-ply)Energy-saving white 'cool roof'; the mainstream pick | $5,900 – $12,500 |
| PVC / modified bitumenBest for chemical/grease exposure or layered systems | $6,850 – $14,400 |
Labor vs. materials in Williston
Install crew, removal, permit & startup — the part Williston rates move most.
Equipment & materials — priced closer to the national level.
Split based on a typical $9,700 Williston project; your mix varies with scope.
How we estimate it
| National range | $5,000 – $15,000 |
| Williston labor adjustment | ×0.92 |
| cold climate factor | ×1.03 |
| Local permit | +$250 |
| Williston estimate | $4,950 – $14,400 |
Promo prices vs. the real cost
The prices that fill your mailbox after a hailstorm are built to look cheap, not to describe the job — here's what those advertised figures usually assume:
- Per-square teaser priceadvertised low; varies by pitch & material
- Free roof inspection$0 — it's a sales visit
- Financing offers$0 down · low APR
Additional flat roof replacement costs to budget for
Expect a few of these rather than all. Which ones apply tracks with access, hidden damage and local code.
| Tear-off & disposal of old membrane | $1,000 – $3,000 |
| Decking / substrate repairFlat roofs trap water, so rot is common | $500 – $3,000 |
| New rigid insulation board (R-value) | $1,000 – $4,000 |
| Drains, scuppers & tapered slope correctionTo stop standing water (ponding) | $500 – $3,000 |
| Flashing & parapet wall detailing | $400 – $2,000 |
| Permit | $150 – $500 |
Typical national add-on ranges; confirm locally during your quote.
What's included
- Insulation board and fasteners/adhesive
- Tear-off of the old membrane
- Membrane material (TPO, EPDM or modified bitumen)
- Flashing, drains, labor and permit
What affects the cost
- Parapet and edge-metal detailing
- Membrane type and thickness (mil)
- Roof area and number of penetrations/drains
- Insulation R-value added
Ways to save on flat roof replacement in Williston
- Mechanically-fastened systems install faster
- TPO offers a good cost-to-performance balance
- Add insulation now to cut energy bills
- Address ponding/drainage to extend membrane life
How long does flat roof replacement last in Williston?
EPDM and TPO last ~20–25 years; PVC up to 30. Standing water shortens any flat-roof membrane.
Twice-yearly inspections to clear drains, reseal seams, and catch ponding before it causes leaks.
Signs you need flat roof replacement in Williston
- Standing water (ponding) that lingers more than 48 hours after rain
- Blisters, bubbles, or splits in the membrane
- Seams or flashing lifting, cracking, or pulling apart
- Interior water stains, drips, or a sagging deck
- The membrane is brittle, cracked, or shrinking with age
- Repeated patch repairs that no longer hold
Repair or replace in Williston?
Repair if…
- Leaks trace to isolated seams, flashing, or a single puncture
- The membrane is under ~15 years old and otherwise sound
- A reflective recoat can extend the existing membrane's life
Replace if…
- The membrane is brittle, blistered, or splitting across the roof
- Chronic ponding has saturated the insulation or decking
- The roof is past 20 years and leaking in multiple spots
Cost calculator
Roof cost by material in Williston, ND
Roofs are priced per square (100 sq ft). An average US home is about 20 squares. Prices are localized to Williston, ND labor; the last column is what each material costs per year of life — often the real deciding number.
| Material | Lifespan | Total (20 sq) | Per year of life |
|---|---|---|---|
Architectural asphalt shingle The default US roof — best cost-per-year for most homes. Wind: up to 130 mph. | 25–30 yr | $6,450–$11,050 | $300/yr |
Flat / low-slope (TPO, EPDM)This page For flat and low-slope roofs; single-ply membrane over the deck. Wind: membrane, fully adhered. | 20–30 yr | $7,350–$14,700 | $450/yr |
Standing-seam metal High upfront cost but the lowest cost-per-year; sheds snow, resists hail and fire. Wind: 140+ mph. | 40–70 yr | $16,550–$29,450 | $400/yr |
Clay / concrete tile Longest-lasting; needs a structure rated for the extra weight. Wind: 125+ mph. | 50–75 yr | $18,400–$36,800 | $450/yr |
Per-square ranges are national installed benchmarks localized to Williston, ND labor; lifespan and wind ratings are manufacturer / ASTM figures. A research estimate, not a quote.
Cheapest time for flat roof replacement in Williston
The material dictates the season (shingles need warmth to seal), but the price is set by demand, and demand spikes after every regional hailstorm. Booking your spot in the quiet winter months for spring work avoids that spike.
Why flat roof replacement quotes vary — and how to compare them fairly
Two contractors can price the same job thousands apart. Almost always it's the scope each assumed — here's what drives the gap and how to close it.
Why a quote looks high (or low)
- One bid is a full tear-off; another lays new shingles over the old roof — cheaper now, costlier later.
- Shingle tier (3-tab vs. architectural vs. premium) changes both material and labor.
- Deck repair, underlayment grade and ventilation may or may not be in the price.
Get an apples-to-apples bid
- Ask how deck/sheathing repairs are priced if rot is found.
- Specify tear-off vs. overlay so all bids match.
- Verify the contractor is licensed, insured and local, with recent references.
- Compare the workmanship warranty, not just the material warranty.
Questions to ask Williston Roofing pros
Quotes only compare cleanly when every bidder is pricing the same work — put these to each of them before you commit.
- 1Is a full tear-off included, or are you laying over the existing roof?
- 2How will you handle deck repairs or rotten sheathing found after tear-off, and at what rate?
- 3What underlayment, ice-and-water shield, and ventilation are included?
- 4Are you licensed and insured here, and can you share recent local references?
- 5What's the workmanship warranty, and how does it interact with the material warranty?
Flat Roof Replacement in Williston
How much does flat roof replacement cost in Williston, ND?
flat roof replacement in Williston runs $4,950–$14,400 as of 2026, with $9,700 the figure most homeowners actually land on. Why that specific number? It reflects Williston labor rates, cold-climate demands and permit fees rather than a flat national figure.
Is flat roof replacement more expensive in Williston than average?
Williston comes in about 3% lower than the national average. The main reason is labor: it indexes at 0.92 relative to the national average., with the local Roofing permit adding roughly $250.
Do I need a permit for flat roof replacement in Williston?
Budget about $250 for the Roofing permit most Williston jobs like this require — and note it already sits inside the estimate above, not on top of it.
What affects flat roof replacement cost the most?
Here's the short version: replacing a flat or low-slope roof using membrane systems such as TPO, EPDM or modified bitumen. Price swings mostly come down to equipment or material grade, the size and complexity of the home, local labor, and the cold climate zone.
Where does a smart roofing budget go in 2026?
A roofing quote can hide a lot behind a single number — whether it's a true tear-off, the shingle grade, and what's under the surface. Here's how our editors sort through it.
The value case
Architectural shingles hit the sweet spot — far more durable than 3-tab for a modest premium, and far cheaper than metal or tile. For most homes they're the right default.
The risk case
The surprise that wrecks a roofing budget is rot in the decking, and you rarely see it until the old shingles come off. Fix the price per replacement sheet in the contract before the crew starts, so a low bid can't quietly climb once the deck is open.
The do-it-right case
Skipping the tear-off means burying whatever's failing underneath, and a second layer bakes the shingles from below until they curl early. Doing it properly means stripping to the deck, then paying for real underlayment, flashing and airflow — the work that sets how long the roof lasts, not just how it looks the first week.
Insist on tear-off over overlay, get the deck-repair rate in writing before work starts, and lean toward architectural shingles. Skipping any of the three tends to cost more later than it saves now.
Editorial analysis by Serhat Özçelik, reviewed by Costadia Editorial. These are our own cost perspectives, not third-party endorsements.
How we calculated this estimate
We start with 2026 national flat roof replacement ranges compiled from contractor-pricing sources (Angi, HomeGuide, Fixr and EnergySage averages), then localize them to Williston using the BEA Regional Price Parity labor index (×0.92 here), the IECC cold-climate factor (×1.03) and a typical local permit fee (≈$250). Federal incentive details reference the IRS Inflation Reduction Act (25C/25D) and DSIRE.
This is a planning estimate, not a quote. Actual prices vary with your home's condition, equipment grade and contractor — always confirm with licensed local pros before budgeting.
References & data sources
Our Williston flat roof replacement estimate is built from these primary, mostly government sources — not a single aggregator.
- Occupational Employment & Wage Statistics (metro wages) — U.S. Bureau of Labor Statistics.Metro-level trade wages behind each city's labor index.
- Regional Price Parities (state & metro) — U.S. Bureau of Economic Analysis.Regional price levels used where metro wage data is unavailable.
- IECC Climate Zones — U.S. DOE — Building Energy Codes Program.Climate-zone factors applied to weather-sensitive projects.
- Home Energy Tax Credits (25C / 25D) — Internal Revenue Service.Federal rebate and tax-credit figures for eligible upgrades.
- Database of State Incentives for Renewables & Efficiency — DSIRE — NC State University.State and utility incentive programs by ZIP code.
Flat roof replacement alternatives in Williston
Homeowners in Williston often pair this with
A flat roof replacement rarely happens in isolation — these projects commonly come up alongside it.
Other projects in Williston
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