Flat Roof Replacement cost in Gresham, OR
Gresham, OR · updated August 2026
$16,600
Typical local cost
$7,400 – $34,500
Typical range
- per sq ft of roof area
- $7.50 – $19.50
- Permit
- Yes
- Typical timeline
- 2-5 days of work
Installed, local pricing
$205 – $805 in fees
2-5 days of work, 2-6 weeks including permitting
Gresham runs +23% against the U.S. average · data confidence High · modeled estimate, not a quote
The modeled midpoint for Gresham is $16,600. The local adjustment for this trade is x1.231 — driven mainly by Multnomah County labor rates and 90% exposure to local code requirements.
Estimate your Gresham job
Priced with this market's cost index, so the calculator, the size table and the ranges on this page all agree.
Roofing squares needed
14.8
Includes 10% waste
- Roof area
- 1,344 sq ft
- Shingle bundles
- 45 bundles
- Underlayment rolls (4 sq)
- 4 rolls
Priced for Gresham (local adjustment x1.231).
Estimates only. Local pricing, site conditions and code requirements change the real number.
Cost by project size
Generated from the same unit pricing the calculator uses.
| Project size | Estimated range |
|---|---|
| 700 sq ft of roof area | $5,300 – $13,700 |
| 1,000 sq ft of roof area | $7,500 – $19,500 |
| 1,200 sq ft of roof area | $9,000 – $23,400 |
| 1,600 sq ft of roof area | $12,000 – $31,200 |
| 2,100 sq ft of roof area | $15,800 – $41,000 |
Based on Gresham pricing of $8–$20 per sq ft of roof area.
Cost by roof scope
Roof pricing moves on area, pitch, how many layers come off and what the deck looks like underneath. Every row is priced against the Gresham median.
| Scope | What it includes | Typical installed cost |
|---|---|---|
| Overlay on a simple ranch roof | Single layer, 4:12 pitch, no tear-off | $10,300 – $13,600 |
| Standard tear-off and replace | One layer removed, architectural shingle, walkable pitch | $14,100 – $19,100 |
| Two-layer tear-off | Extra removal and disposal, same footprint | $16,600 – $22,400 |
| Steep or cut-up roof | 8:12+ pitch, multiple valleys, dormers, staging | $20,800 – $28,200 |
| Replacement with deck repair | Partial resheathing found after tear-off | $19,100 – $26,600 |
- • Tear-off and disposal is priced per layer — quotes that omit a second layer are the most common source of change orders.
- • Decking is unknown until the old roof is off. Reputable quotes state a per-sheet resheathing price up front.
- • Pitch above 7:12 requires fall protection and slows the crew, which shows up as labor, not material.
Basis: Each scope is priced as a multiple of the modeled Gresham median for flat roof replacement, so the scenarios, the size table and the calculator always agree. · Hometriva methodology
Cost by material
Installed cost in this market, with expected service life.
| Material | Installed range | Lifespan | Maintenance |
|---|---|---|---|
| Standing-Seam Metal Roof | $24,900 – $39,800 | 40–70 yrs | Very low |
| TPO Membrane | $14,100 – $20,800 | 18–25 yrs | Low |
Where the money goes
- Labor
- $9,100
- 53% of median
- Materials
- $7,500
- 44% of median
- Permit & fees
- $505
- 3% of median
Gresham project costs+23% vs U.S. average
Based on Multnomah County labor rates, local material logistics and permit-fee posture for this trade.
What the project looks like start to finish
Typical sequence for this scope. Timing varies with contractor backlog and plan-review queues.
01
Planning & quotes
Scope, material choice, contractor selection
02
Permit application
Filed with City of Gresham building department
03
Materials & staging
Order lead time on non-stock materials
04
Installation
2-5 days of work, 2-6 weeks including permitting
05
Inspection
Dry-in inspection, In-progress attachment, Final roof inspection
06
Closeout
Final sign-off, warranty and documentation
Gresham labor intelligence
What the trade charges here, and how much of your price it is.
Loaded hourly rate
$71–$92
Exterior crews in Multnomah County · +18% vs U.S. ($68/hr)
Typical crew
3 × 4.5 days
On-site time for a typical flat roof job here.
Labor in the price
$9,100
55% of the median — the rest is material, disposal and permit.
Because labor is 55% of this job, Gresham wage levels move the price far more than material prices do. A quote well under this labor figure usually means a smaller crew, a longer schedule, or unlicensed help.
Basis: Hometriva labor model: national exterior crew rates adjusted by the Multnomah County labor factor (x1.182). · BLS Occupational Employment and Wage Statistics, Hometriva methodology
Why Gresham differs from the national average
The local delta, broken into dollars by driver.
Trade labor rates+$1,350
Multnomah County crews price 18% above the national average, and labor is 55% of this job.
Code and inspection load+$1,050
Flat Roof Replacement carries 90% exposure to local code requirements, and this jurisdiction's review load indexes at x1.09.
Material and delivery+$575
Materials are nationally traded, so they move less — but delivery into this market runs 9% over baseline.
Permit fees+$75
Fees are paid to the jurisdiction, not the contractor, and are budgeted separately from the contract price.
Basis: Decomposition of the modeled Gresham median against the U.S. median for this scope. · City of Gresham building department, Hometriva methodology
Gresham vs Oregon vs the U.S.
Change the inputs, see your number
The same local model, run against your job instead of the average one.
Simulated flat roof replacement in Gresham
$17,105
Likely range $7,905 – $35,005
Simulated from the same local model as the numbers above — it changes the inputs, not the pricing method.
What makes the number move
- Membrane type: modified bitumen, TPO or coating
- Tapered insulation to correct ponding
- Number of penetrations and curbs
- Tear-off layers
- Parapet and flashing detail work
Who issues each permit
Tracked per discipline — the building permit issuer is not always the body that reviews electrical, plumbing, zoning or fire.
| Discipline | Issuing authority |
|---|---|
| building | City of Gresham building departmentModeled estimate |
| electrical | City of Gresham building departmentModeled estimate |
| mechanical | City of Gresham building departmentModeled estimate |
| plumbing | City of Gresham building departmentModeled estimate |
| zoning | City of Gresham building departmentModeled estimate |
| fire | City of Gresham building departmentModeled estimate |
Permit requirement in Gresham
Yes — a permit is required for flat roof replacement in Gresham, OR. The work must be inspected before it can be closed out, and a licensed contractor generally has to pull the permit.
- Permitting authority
- City of Gresham building departmentModeled estimate
- Permit fee
- Estimated allowance $205–$805Modeled from comparable fee schedules — not an official quoted fee.
Inspections
- Dry-in inspection
- In-progress attachment
- Final roof inspection
Local conditions that change this job
Only the exposures that materially affect flat roof replacement.
Cooling load / heat exposure
Severe82/100
Annual rainfall
High74/100
Named-storm exposure
High70/100
Solar irradiance
Severe82/100
Gresham sits in Multnomah County, Oregon. Persistent rainfall and moisture management dominate exterior detailing, while seismic provisions apply to structural and foundation work. Work outside city limits is permitted by the county building department rather than the city.
Nearby market comparison
What Gresham homeowners actually paid
Homeowner-reported invoices for this market. Nothing is published until enough reports clear review, so this section is often empty in newer markets — adding yours takes 20 seconds and no personal details.
Quotes homeowners were given in Gresham
Quotes run ahead of final invoices. Reporting yours shows the local spread and where there is room to negotiate.
How Hometriva estimates Gresham flat roof costs
Hometriva does not publish invented city prices. The Gresham estimate for flat roof replacement is produced by this chain, and every input is stored separately:
- National baseline$13,500
Typical U.S. cost for flat roof replacement on a single-family home.
- Local labor factorx1.182
Gresham-area trade labor rates, weighted at 55% of this job.
- Material factorx1.094
Material and delivery pricing into Multnomah County, weighted at 45%.
- Regulatory factorx1.086
Local code, product-approval and inspection load, applied at 90% for this project type.
- Applied multiplierx1.231
Blended Gresham adjustment specific to flat roof replacement.
- Permit component$205 – $805
Budgeted separately from the contract price because it is paid to the jurisdiction.
Because labor, material and regulatory factors are weighted per project, flat roof replacement in Gresham carries a different local adjustment than other trades in the same market.
Reviewed by
Hometriva Cost Data Desk
Maintains the unit-cost baselines, local adjustment factors and material pricing. Reviewed for flat roof replacement pricing in Gresham, OR.
- • National unit-cost baselines against current trade pricing
- • Local labor and materials factors for the market
- • Material installed-cost ranges and service life
Last reviewed August 2026 · Editorial standards · Report an error
Frequently asked questions
Do I need a permit for flat roof replacement in Gresham, OR?
In most jurisdictions this work is permitted and inspected. Requirements are set locally, so confirm the current application and inspection checklist with your building department before work starts.
How long does flat roof replacement take?
2-5 days of work, 2-6 weeks including permitting. Permit review and inspection scheduling are usually the largest source of variation.
What changes the price the most?
The largest cost drivers are membrane type: modified bitumen, tpo or coating; tapered insulation to correct ponding; number of penetrations and curbs.
Sources
Sources & verification
Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.