Mold Remediation cost in Portsmouth, NH
Portsmouth, NH · updated August 2026
$4,900
Typical local cost
$1,600 – $16,200
Typical range
- per sq ft of affected area
- $13 – $38
- Permit
- It depends
- Typical timeline
- 3-10 days of work
Installed, local pricing
$0 – $260 in fees
3-10 days of work
Portsmouth runs +8% against the U.S. average · data confidence Medium · modeled estimate, not a quote
The modeled midpoint for Portsmouth is $4,900. The local adjustment for this trade is x1.083 — driven mainly by Rockingham County labor rates and 30% 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
Priced for Portsmouth (local adjustment x1.083).
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 |
|---|---|
| 125 sq ft of affected area | $1,600 – $4,800 |
| 150 sq ft of affected area | $2,000 – $5,700 |
| 200 sq ft of affected area | $2,600 – $7,600 |
| 250 sq ft of affected area | $3,300 – $9,500 |
| 325 sq ft of affected area | $4,200 – $12,400 |
Based on Portsmouth pricing of $13–$38 per sq ft of affected area.
Where the money goes
- Labor
- $3,700
- 74% of median
- Materials
- $1,200
- 24% of median
- Permit & fees
- $130
- 3% of median
Portsmouth project costs+8% 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
Permit application
Filed with City of Portsmouth building department
03
Materials & staging
Order lead time on non-stock materials
04
Installation
3-10 days of work
05
Inspection
Post-remediation verification testing, Building inspection if structural repairs follow
06
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
$69–$90
Restoration crews in Rockingham County · +9% vs U.S. ($72/hr)
Typical crew
2 × 3 days
On-site time for a typical mold job here.
Labor in the price
$3,700
75% of the median — the rest is material, disposal and permit.
Because labor is 75% 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 restoration 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.
Trade labor rates+$300
Rockingham County crews price 9% above the national average, and labor is 75% of this job.
Material and delivery+$50
Materials are nationally traded, so they move less — but delivery into this market runs 5% over baseline.
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 mold remediation in Portsmouth
$5,030
Likely range $1,730 – $16,330
Simulated from the same local model as the numbers above — it changes the inputs, not the pricing method.
What makes the number move
- Affected square footage and number of rooms
- HVAC system contamination
- Containment and negative air equipment
- Demolition and reconstruction of affected assemblies
- Independent clearance testing
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
It depends on scope. Like-for-like cosmetic work in Portsmouth is often exempt, but a permit is required as soon as you change structure, plumbing, electrical or the building envelope.
- Permitting authority
- City of Portsmouth building departmentModeled estimate
- Permit fee
- Estimated allowance $0–$260Modeled from comparable fee schedules — not an official quoted fee.
Inspections
- Post-remediation verification testing
- Building inspection if structural repairs follow
Local conditions that change this job
Only the exposures that materially affect mold remediation.
Humidity
Severe84/100
Flood zone exposure
Moderate50/100
Annual rainfall
High74/100
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 affected area |
|---|---|---|---|
| Portsmouth (this page) | x1.083 | $4,900 | $13 – $38 |
| Dover | x1.083 | $4,900 | $13 – $38 |
| Manchester | x1.122 | $5,000 | $13.50 – $39.50 |
| Lowell | x1.333 | $6,000 | $16 – $46.50 |
+ Had mold remediation done in Portsmouth? Add what you paid or were quoted
Reports are reviewed before they count, and nothing is published until at least 5 reports exist for a market. No name, email or address is collected.
How Hometriva estimates Portsmouth mold costs
Hometriva does not publish invented city prices. The Portsmouth estimate for mold remediation is produced by this chain, and every input is stored separately:
- National baseline$4,500
Typical U.S. cost for mold remediation on a single-family home.
- Local labor factorx1.091
Portsmouth-area trade labor rates, weighted at 75% of this job.
- Material factorx1.055
Material and delivery pricing into Rockingham County, weighted at 25%.
- Regulatory factorx1.004
Local code, product-approval and inspection load, applied at 30% for this project type.
- Applied multiplierx1.083
Blended Portsmouth adjustment specific to mold remediation.
- Permit component$0 – $260
Budgeted separately from the contract price because it is paid to the jurisdiction.
Because labor, material and regulatory factors are weighted per project, mold remediation 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 mold remediation 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
How long does mold remediation take?
3-10 days of work. Permit review and inspection scheduling are usually the largest source of variation.
What changes the price the most?
The largest cost drivers are affected square footage and number of rooms; hvac system contamination; containment and negative air equipment.
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.