Attic Insulation cost in Portsmouth, NH
Portsmouth, NH · updated August 2026
$3,000
Typical local cost
$1,300 – $8,000
Typical range
- per sq ft of attic floor
- $1.50 – $5
- Permit
- Usually no
- Typical timeline
- 1 day of work
Installed, local pricing
$0 – $130 in fees
1 day of work
Portsmouth runs +7% against the U.S. average · data confidence Medium · modeled estimate, not a quote
Most Portsmouth homeowners pay around $3,000. The local adjustment for this trade is x1.068 — driven mainly by Rockingham County labor rates and 5% exposure to local code requirements.
Estimate your Portsmouth job
Priced with this market's cost index, so the calculator, the size table and the ranges on this page all agree.
Square footage
180 sq ft
- With waste allowance
- 198 sq ft
- Square yards
- 20
- Perimeter (per area)
- 54 ft
- Square meters
- 16.72
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 |
|---|---|
| 600 sq ft of attic floor | $900 – $3,000 |
| 800 sq ft of attic floor | $1,200 – $4,000 |
| 1,000 sq ft of attic floor | $1,500 – $5,000 |
| 1,300 sq ft of attic floor | $2,000 – $6,500 |
| 1,700 sq ft of attic floor | $2,600 – $8,500 |
Based on Portsmouth pricing of $2–$5 per sq ft of attic floor.
Where the money goes
- Labor
- $1,100
- 35% of median
- Materials
- $2,000
- 63% of median
- Permit & fees
- $65
- 2% of median
Portsmouth project costs+7% vs U.S. average
Based on Rockingham 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
Scheduling
No permit typically required for this scope
03
Materials & staging
Order lead time on non-stock materials
04
Installation
1 day of work
05
Closeout
Final sign-off, warranty and documentation
Portsmouth labor intelligence
What the trade charges here, and how much of your price it is.
Loaded hourly rate
$82–$106
Energy crews in Rockingham County · +9% vs U.S. ($85/hr)
Typical crew
2 × 0.5 days
On-site time for a typical insulation job here.
Labor in the price
$1,100
35% of the median — the rest is material, disposal and permit.
Because labor is 35% of this job, Portsmouth 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 energy crew rates adjusted by the Rockingham County labor factor (x1.091). · BLS Occupational Employment and Wage Statistics, Hometriva methodology
Why Portsmouth differs from the national average
The local delta, broken into dollars by driver.
Material and delivery+$100
Materials are nationally traded, so they move less — but delivery into this market runs 5% over baseline.
Trade labor rates+$100
Rockingham County crews price 9% above the national average, and labor is 35% of this job.
Basis: Decomposition of the modeled Portsmouth median against the U.S. median for this scope. · City of Portsmouth building department, Hometriva methodology
Portsmouth vs New Hampshire vs the U.S.
Change the inputs, see your number
The same local model, run against your job instead of the average one.
Simulated attic insulation in Portsmouth
$3,065
Likely range $1,365 – $8,065
Simulated from the same local model as the numbers above — it changes the inputs, not the pricing method.
What makes the number move
- Attic square footage and existing R-value
- Blown cellulose or fiberglass versus spray foam
- Air sealing of penetrations before insulating
- Attic access and headroom
- Removal of contaminated existing insulation
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 Portsmouth building departmentModeled estimate |
| electrical | City of Portsmouth building departmentModeled estimate |
| mechanical | City of Portsmouth building departmentModeled estimate |
| plumbing | City of Portsmouth building departmentModeled estimate |
| zoning | City of Portsmouth building departmentModeled estimate |
| fire | City of Portsmouth building departmentModeled estimate |
Permit requirement in Portsmouth
Usually no permit is required in Portsmouth, but zoning rules such as setbacks and HOA approval can still apply.
- Permitting authority
- City of Portsmouth building departmentModeled estimate
- Permit fee
- Estimated allowance $0–$130Modeled from comparable fee schedules — not an official quoted fee.
Local conditions that change this job
Only the exposures that materially affect attic insulation.
Cooling load / heat exposure
Severe82/100
Solar irradiance
Severe82/100
Humidity
Severe84/100
Portsmouth sits in Rockingham County, New Hampshire. Deep frost lines, snow load and a very old housing stock mean permits frequently touch structural, electrical and energy-code upgrades at once. Work outside city limits is permitted by the county building department rather than the city.
Nearby market comparison
| Market | Local factor | Median | Per sq ft of attic floor |
|---|---|---|---|
| Portsmouth (this page) | x1.068 | $3,000 | $1.50 – $5 |
| Manchester | x1.093 | $3,100 | $1.50 – $5 |
| Nashua | x1.093 | $3,100 | $1.50 – $5 |
| Concord | x1.068 | $3,000 | $1.50 – $5 |
What Portsmouth homeowners actually paid
Real reported invoices from this market, aggregated. Add yours — it takes 20 seconds and no personal details.
Quotes homeowners were given in Portsmouth
Quotes run ahead of final invoices. Reporting yours shows the local spread and where there is room to negotiate.
How Hometriva estimates Portsmouth insulation costs
Hometriva does not publish invented city prices. The Portsmouth estimate for attic insulation is produced by this chain, and every input is stored separately:
- National baseline$2,800
Typical U.S. cost for attic insulation on a single-family home.
- Local labor factorx1.091
Portsmouth-area trade labor rates, weighted at 35% of this job.
- Material factorx1.055
Material and delivery pricing into Rockingham County, weighted at 65%.
- Regulatory factorx1.004
Local code, product-approval and inspection load, applied at 5% for this project type.
- Applied multiplierx1.068
Blended Portsmouth adjustment specific to attic insulation.
- Permit component$0 – $130
Budgeted separately from the contract price because it is paid to the jurisdiction.
Because labor, material and regulatory factors are weighted per project, attic insulation in Portsmouth 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 attic insulation pricing in Portsmouth, NH.
- • 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
What R-value does Florida require in the attic?
The Florida Energy Conservation Code generally calls for R-30 to R-38 in a vented attic for a residential retrofit. Check with your building department, since the requirement depends on assembly type.
Sources
Sources & verification
Last verified August 2026. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing — they are not quotes. Permit rules change; confirm with the building department before starting work.