Dock Construction cost in Portsmouth, NH
Portsmouth, NH · updated August 2026
$28,100
Typical local cost
$9,700 – $91,800
Typical range
- per sq ft of dock
- $50 – $150
- Permit
- Yes
- Typical timeline
- 2-5 weeks of work
Installed, local pricing
$305 – $1,740 in fees
2-5 weeks of work, 4-12 months including environmental review
Portsmouth runs +8% against the U.S. average · data confidence Medium · modeled estimate, not a quote
Most Portsmouth homeowners pay around $28,100. The local adjustment for this trade is x1.080 — driven mainly by Rockingham County labor rates and 90% 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.
Deck area
320 sq ft
- Decking (linear feet)
- 696 lf
- 16 ft boards needed
- 44 boards
- Joists
- 16 at 16" o.c.
- Footings
- 8
- Installed cost estimate
- $13,464 – $21,384
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 |
|---|---|
| 150 sq ft of dock | $7,500 – $22,500 |
| 200 sq ft of dock | $10,000 – $30,000 |
| 250 sq ft of dock | $12,500 – $37,500 |
| 325 sq ft of dock | $16,300 – $48,800 |
| 425 sq ft of dock | $21,300 – $63,800 |
Based on Portsmouth pricing of $50–$150 per sq ft of dock.
Where the money goes
- Labor
- $16,900
- 58% of median
- Materials
- $11,200
- 38% of median
- Permit & fees
- $1,025
- 4% 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
2-5 weeks of work, 4-12 months including environmental review
05
Inspection
Piling inspection, Framing inspection, Electrical inspection for dock power, Final inspection
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
$84–$109
Waterfront crews in Rockingham County · +9% vs U.S. ($88/hr)
Typical crew
4 × 5.5 days
On-site time for a typical dock job here.
Labor in the price
$16,900
60% of the median — the rest is material, disposal and permit.
Because labor is 60% 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 waterfront 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+$1,425
Rockingham County crews price 9% above the national average, and labor is 60% of this job.
Material and delivery+$575
Materials are nationally traded, so they move less — but delivery into this market runs 5% over baseline.
Permit fees-$150
Fees are paid to the jurisdiction, not the contractor, and are budgeted separately from the contract price.
Code and inspection load+$100
Dock Construction carries 90% exposure to local code requirements, and this jurisdiction's review load indexes at x1.00.
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 dock construction in Portsmouth
$29,125
Likely range $10,725 – $92,825
Simulated from the same local model as the numbers above — it changes the inputs, not the pricing method.
What makes the number move
- Dock square footage and walkway length
- Water depth and piling count
- Boat lift capacity
- Decking material: pressure-treated, composite or Ipe
- Seagrass surveys and mitigation requirements
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
Yes — a permit is required for dock construction in Portsmouth, NH. 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 Portsmouth building departmentModeled estimate
- Permit fee
- Estimated allowance $305–$1,740Modeled from comparable fee schedules — not an official quoted fee.
Inspections
- Piling inspection
- Framing inspection
- Electrical inspection for dock power
- Final inspection
Local conditions that change this job
Only the exposures that materially affect dock construction.
Coastal / salt-air exposure
Moderate45/100
Named-storm exposure
High70/100
Flood zone exposure
Moderate50/100
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 dock |
|---|---|---|---|
| Portsmouth (this page) | x1.080 | $28,100 | $50 – $150 |
| Manchester | x1.126 | $29,300 | $50 – $200 |
| Nashua | x1.126 | $29,300 | $50 – $200 |
| Concord | x1.080 | $28,100 | $50 – $150 |
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 dock costs
Hometriva does not publish invented city prices. The Portsmouth estimate for dock construction is produced by this chain, and every input is stored separately:
- National baseline$26,000
Typical U.S. cost for dock construction on a single-family home.
- Local labor factorx1.091
Portsmouth-area trade labor rates, weighted at 60% of this job.
- Material factorx1.055
Material and delivery pricing into Rockingham County, weighted at 40%.
- Regulatory factorx1.004
Local code, product-approval and inspection load, applied at 90% for this project type.
- Applied multiplierx1.080
Blended Portsmouth adjustment specific to dock construction.
- Permit component$305 – $1,740
Budgeted separately from the contract price because it is paid to the jurisdiction.
Because labor, material and regulatory factors are weighted per project, dock construction 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 dock construction 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
Do I need a permit to build a dock in Florida?
Always. A residential dock requires a local building permit plus state environmental authorization, and most waterways also require federal Army Corps review. Exemptions exist for very small private docks but must be confirmed in writing.
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.