Siding Installation Cost in Portsmouth, NH (2026)
Updated October 2026 · Portsmouth, NH · index 1.11
How much does new siding cost in Portsmouth? For 2,000 sq ft of wall with vinyl siding, homeowners in Portsmouth, NH pay about $15,300 on average, and most quotes land between $10,400 and $20,100 — $5.19 to $10.07 per sq ft of wall. The price covers removing the old siding, house wrap, flashing at every opening, the new siding with corners and trim, vents and blocks, caulk, the dumpster and cleanup.
The siding installation price in Portsmouth runs 11% above the U.S. average: construction labor in the Portsmouth area runs 18% above the national mean, materials 1% above. The same job averages $13,800 nationally and about $13,600 at the New Hampshire statewide index.
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Siding installation price in Portsmouth by siding material
What 2,000 sq ft of wall costs in Portsmouth with each siding material, installed:
| Option | Average · range |
|---|---|
| Vinyl sidingdouble-4 lap, factory color$7.63 per sq ft of wall | $15,300$10,400 – $20,100 |
| Fiber-cement sidinglap board, blind-nailed into studs$12.63 per sq ft of wall | $25,300$17,400 – $33,100 |
The least expensive option in Portsmouth is vinyl siding, at about $15,300; fiber-cement siding averages $25,300, 1.7 times as much.
Cost to replace siding in Portsmouth by size
With vinyl siding, priced for Portsmouth, NH:
| Size | Average · range |
|---|---|
| 1,500 sq ft of wall$7.75 per sq ft of wall | $11,600$7,900 – $15,400 |
| 2,000 sq ft of wall$7.63 per sq ft of wall | $15,300$10,400 – $20,100 |
| 2,500 sq ft of wall$7.56 per sq ft of wall | $18,900$12,900 – $24,900 |
Some costs stay the same whatever the size — measure and material takeoff, site protection, cleanup and warranty registration — so a bigger job costs less per unit: $7.56 per sq ft of wall for 2,500 sq ft of wall against $7.75 for 1,500 sq ft of wall.
What a siding installation in Portsmouth includes
Line by line, the $15,300 average for 2,000 sq ft of wall breaks down like this: 60% labor, 40% materials and equipment.
| Line | Low – high |
|---|---|
| Measure and material takeoff | $110 – $290 |
| Site protection | $150 – $370 |
| Old siding removed to the sheathing | $880 – $2,050 |
| Dumpster and landfill fees | $330 – $660 |
| House wrap, taped and sealed | $660 – $1,250 |
| Window and door flashing | $580 – $1,500 |
| Starter strip and corners | $740 – $1,700 |
| Siding, supplied and installed | $5,100 – $8,050 |
| Window and door trim | $940 – $2,050 |
| Vents, hoods and mounting blocks | $260 – $700 |
| Caulk and sealant | $220 – $510 |
| Lights, shutters and downspouts reset | $260 – $660 |
| Cleanup and warranty registration | $150 – $370 |
Each line is the price book's U.S. rate for that step, scaled by 0.66 to the installed price published sources give for the whole job (see how these prices are built), times Portsmouth's index of 1.11; permit fees are not scaled.
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What affects siding installation prices in Portsmouth
Labor and materials in Portsmouth
Construction wages in the Portsmouth metro run 27% above the U.S. mean (BLS, May 2025), and specialty-contractor pay in the city's county moves that down by 7%, to 18% above the national mean. Materials in the area's ZIP codes price 1% above the national average. Together they give Portsmouth a construction cost index of 1.11.
Where Portsmouth sits in New Hampshire
Portsmouth is the most expensive of the 4 New Hampshire cities in our index, against a statewide index of 0.99. Concord is the least expensive at 0.98.
Against the rest of the country
Of the 306 U.S. cities in JobFlex's index, Portsmouth ranks 75th from the most expensive. The job that averages $15,300 here averages $13,800 at the national rate.
Sales tax in New Hampshire
New Hampshire has no state sales tax. Prices on this page are before any tax.
What a Portsmouth contractor will ask before quoting
- Stories and access — lift or scaffold?
- Existing siding type and what is under it
- Trim profile and paint scope
Siding installation cost in other New Hampshire cities
2,000 sq ft of wall with vinyl siding averages $15,300 in Portsmouth; $13,500 in Concord, $13,600 in Nashua, $13,600 in Manchester.
| City | Average · range |
|---|---|
| Concord, NH12% less | $13,500$9,150 – $17,800 |
| Nashua, NH11% less | $13,600$9,250 – $18,000 |
| Manchester, NH11% less | $13,600$9,250 – $18,000 |
siding installation price in Portsmouth: questions
How much does new siding cost in Portsmouth, NH?
About $15,300 for 2,000 sq ft of wall with vinyl siding, and most Portsmouth quotes fall between $10,400 and $20,100. That is 11% above the U.S. average, where the same job averages $13,800.
What is the siding price per square foot in Portsmouth?
$5.19 to $10.07 per sq ft of wall, about $7.63 on average with vinyl siding. Smaller jobs cost more per unit, because the fixed costs are spread over less.
How much is 2,500 sq ft of wall in Portsmouth?
$12,900 to $24,900, about $18,900 on average, with vinyl siding — $7.56 per sq ft of wall.
Do you need a permit for siding installation in Portsmouth?
It depends on the city: for re-siding some building departments want a permit and some don't, so check with Portsmouth's.
Does the price include sales tax in New Hampshire?
No tax is included, and New Hampshire has no state sales tax.
What is the cheapest siding material for siding installation in Portsmouth?
Vinyl siding, at about $15,300 for 2,000 sq ft of wall. Fiber-cement siding runs about $25,300.
Other home projects in Portsmouth
Siding installation cost in New Hampshire
How these prices are built
Every price on this page comes from JobFlex's contractor price book: what a homeowner pays a licensed contractor for each step of the job, as a U.S. national average per unit, with the contractor's overhead and profit included and sales tax left out. The siding installation is priced step by step, then multiplied by Portsmouth's construction cost index of 1.11.
Where the price book's steps for an option add up to more than 20% over the installed price a published source gives for the whole job, every step but a permit fee is scaled down to the middle of that range: vinyl siding × 0.66 (HomeGuide/This Old House 2026 plus Modernize/Dropcurb 2026: $4.25–$9.50 per sq ft of wall); fiber-cement siding × 0.82 (HomeGuide 2026 plus Modernize/Dropcurb 2026: $6.25–$16.50 per sq ft of wall).
The index weighs local construction wages (BLS Occupational Employment and Wage Statistics, May 2025) at 60% and the area's material prices (Craftsman ZIP-area factors) at 40%. Published indices for Portsmouth, each on its own base: RSMeans residential 0.95, HUD 1.02, Craftsman 1.06. Treat any city figure as about ±5%; a contractor's quote for your house is the number to plan with.
Contractors in Portsmouth build quotes like these with JobFlex's Smart Proposal estimator.
- HomeGuide 2026: fiber-cement siding $6-$15/sqft installed, labor $4-$9/sqft
- HomeGuide/This Old House 2026: vinyl siding $4-$8/sqft installed
- Modernize/Dropcurb 2026: siding removal $0.25-$1.50/sqft