We Make It Easy to Find a General Contractor in Dover, New Hampshire
Dover falls between Portsmouth and Rochester on price. Which one your project resembles depends mostly on what you're renovating.
We match you with three vetted builders. Free to you.
- 100% free for homeowners
- Same-day response before 5pm
- 10-step contractor vetting
Dover's downtown mill conversions are the wildcard on this page. Those Cocheco River buildings are heavy industrial structures adapted into apartments, so the timber posts, masonry bearing walls and original floors are usually holding up the units above you, not just your own.
Pricing here follows the Seacoast, not inland New Hampshire. Many crews rotate through Portsmouth, Dover, Rochester and over the river into Kittery, so a Dover quote generally sits above a Rochester quote for identical work and below a Portsmouth one.
We're Seth's Home Pros, and we run an introduction service: we learn your project, then put three screened builders in front of you quoting the same scope. That costs you nothing. The screening covers insurance, references, financial stability and work history, and it's a snapshot of one moment, not a promise about how a crew will perform.
Why does Dover carry Seacoast pricing?
Dover is a genuine Seacoast community with lower prices than Portsmouth.
That draws many buyers to Dover and keeps renovation work steady. The same budget that buys a compromise in Portsmouth can buy something workable here, leaving money for the house.
Dover draws from the Seacoast contractor pool. Many crews work in Portsmouth, Dover, Rochester and the communities across the river.
Some also cover Kittery and York. Their rates follow the Seacoast market, so Dover quotes usually sit meaningfully above Rochester prices for the same scope.
Two more things to know.
No sales tax on materials. New Hampshire doesn't have one, which is a real factor on a large materials package and a genuine difference from building on the Maine side.
Milder winters than most of northern New England. Seacoast New Hampshire has a longer build season than the Maine interior, which means more scheduling flexibility than Bangor or Skowhegan.
Away from downtown, Dover is fairly conventional. Established neighborhoods surround Garrison Hill, while newer development extends outward.
Most projects sit on regular lots and are straightforward.
- 250+projects completed
- 8+years serving Maine
- 1 weekaverage to your first quote
- $0cost to you, the homeowner
Ready for three quotes on your Dover project?
A few quick questions about the work, then we match you with three vetted contractors. Free, and no obligation to hire any of them.
How much does a general contractor cost in Dover, NH?
Dover prices fall between Portsmouth and Rochester:
| Project | Range | Timeline |
|---|---|---|
| Bath remodel, deck, small addition | $20,000 – $60,000 | 3 – 8 weeks |
| Kitchen remodel, basement finish, garage build | $48,000 – $170,000 | 5 – 12 weeks |
| Whole-home renovation, large addition, custom build | $170,000 – $600,000+ | 14 – 26 weeks |
A general contractor's fee is usually 10% to 20% of the project cost.
Mill-unit renovations often cost more per square foot than comparable single-family remodels. Reasons include structural constraints and shared systems, plus association requirements and difficult material access in buildings never designed for it.
Other services in Dover
Which towns around Dover do we serve?
What is a mill building, structurally?
Dover grew around the Cocheco River mills. Converting those buildings into housing became a defining feature of downtown.
If you own or plan to buy a converted mill unit, know what you're getting into. These aren't houses.
They're heavy industrial structures adapted for housing, and renovations behave differently inside them.
The structure isn't yours to move. Heavy timber posts and beams, masonry bearing walls, and the original floor system are the building's structure and frequently serve every unit above and below. What looks like a wall you'd like gone may be carrying the building.
You're likely inside a condominium association. Which means the association's rules, not just the city's code, govern what you can change, when work can happen, and how materials come in and out. That's a document to read before you design, not after.
Systems are shared. Plumbing, electrical, and mechanical often run through common chases serving multiple units. Relocating a kitchen or a bath is a building question, not a unit question.
Sound transmission matters more. In a converted mill with hard surfaces and shared structure, floor assembly changes affect your neighbors, and associations frequently have specific requirements about it.
The right builder has worked on mill conversions. Someone limited to single-family remodeling may struggle with the structure or association requirements, regardless of how good his finish work is.
General experience isn't enough here.
Beyond the mills, Dover's older neighborhoods contain genuinely old homes. As New Hampshire's first permanent settlement, the city has downtown housing with old framing and layered systems.
Then come the usual century-plus surprises.
Mill-conversion owners must work within association rules. Buyers renovate older downtown housing.
And families in the outlying neighborhoods build additions.
Start with permits through City of Dover Inspection Services. Mill buildings may need structural review, while some projects require association approval.
Then come the trades and inspections.
The main areas include downtown and the mill district, plus Garrison Hill and the Cocheco neighborhoods. Residential sections extend toward Somersworth.
Others run toward Rollinsford and Madbury.
Dover follows a Seacoast construction schedule, which is milder and longer than inland New Hampshire's. Interior work continues all year.
For a condominium, put the association's approval process at the front of the timeline. It can take longer than the City of Dover permit.
Mill conversions set Dover apart. Few places in this region have so much industrial space adapted into housing.
Renovating one requires a different discipline than renovating a house.
On licensing: New Hampshire does not license general contractors at the state level. Permits come from the city and a contractor should be registered as a business with the Secretary of State. Insurance, references, financial stability and reputation are the real checks, and our 10-step process covers them.
What do Dover homeowners want to know first?
What's different about renovating a converted mill unit in Dover?
Structure is shared and often can't be altered, systems run through common chases, and a condominium association's rules apply on top of city code. Read the association documents before designing.
Is Dover cheaper than Portsmouth?
Generally yes for comparable property, though the contractor pool and pricing are both Seacoast.
Do general contractors need a license in Dover, New Hampshire?
New Hampshire does not license general contractors at the state level. Permits come from the city. Verify insurance and references.
Should I get the contract in writing?
Always. New Hampshire's contract rules differ from Maine's, so don't assume Maine protections apply here.
How do you start a Dover project?
A mill unit and a house require two different searches with two different builder lists.