Working With Us
Hiring an ADU builder in Truro
Lower Cape ADU is a licensed accessory dwelling unit builder serving Truro and the seven other Lower Cape towns. Our office is in North Eastham, at Unit #7, 4250 State Highway, about twenty minutes south of Truro on Route 6. Truro is well inside our daily working radius.
Truro has large lots on paper and real constraints in practice: septic, slope, and resource-area setbacks. Getting the siting right the first time is most of the job.
We handle Truro ADU projects end to end — site assessment, design, permitting, and construction supervision — so you are working with one accountable party from the first conversation through to occupancy, rather than coordinating a designer, an expediter, and a contractor yourself.
- Vern Hatt, owner
- MA Construction Supervisor License #CS62739
- MA Home Improvement Contractor License #177590
- Office in North Eastham
What an Truro ADU project looks like
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Free consultation
We sit down with you — no charge, no obligation — and talk about what you are actually trying to solve on your Truro property: rental income, room for family, a place to downsize into, or staying put as you age.
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Property assessment
We walk the property and look at the things that decide the project: lot area, setbacks, septic or sewer, grade, access, and what the existing house can support.
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Legal and physical limits
We establish what Truro and the Massachusetts Affordable Homes Act actually allow on your parcel, so the design starts from a real envelope rather than a hopeful one.
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Preliminary design and estimate
We produce a preliminary design and a good-faith estimate as part of the bidding process, so you can see the project and its cost before committing to anything.
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Permitting
We prepare and submit the permit package and represent the project before the Truro Building Department, the Truro Board of Health for septic review, and where a project calls for it, the Planning Board or Zoning Board of Appeals as required.
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Construction supervision
We supervise construction through to occupancy, as a licensed Massachusetts Construction Supervisor working on your Truro property.
What We Build
Types of ADUs we build in Truro
Which of these fits depends on your lot, your septic or sewer situation, and what you are trying to accomplish. We work through that with you before recommending one.
Standalone Cottages in Truro
A detached cottage on your own lot — the most flexible option when land and septic allow it.
Garage Conversions in Truro
Converting an existing garage, or building above one, often on an already-approved footprint.
Basement Conversions in Truro
A lower-level unit using space you already have, where ceiling height and egress work out.
Attic Conversions in Truro
Overhead space turned into a compact unit without expanding the building footprint.
Modular & Prefab in Truro
Factory-built units that shorten on-site construction time and tighten the schedule.
The Local Picture
In Truro, every buildable acre counts
Truro is the Cape at its most elemental: open moorland, the Highland Light standing over the Atlantic, Pamet Harbor tucked into the hills, and a year-round population smaller than almost any town in the Commonwealth. Roughly seventy percent of Truro lies within the Cape Cod National Seashore, which means new house lots are rare and existing properties are correspondingly valuable. That scarcity is the strongest argument for an ADU here — it lets a homeowner add a second home on land they already own.
Why an ADU Fits Here
Truro character, Truro opportunity
What makes Truro Truro—and how a well-designed accessory dwelling unit fits naturally into it.
Highland Light & the Dunes
Truro's Highland Light and its dune landscape define the Outer Cape's drama. Building here means working at a modest, respectful scale — exactly what an ADU is: a small, subordinate unit that doesn't compete with the land.
National Seashore Majority
With most of Truro inside the National Seashore, buildable land is among the scarcest on the Cape. An ADU is often the only realistic way to add housing or rental income to a Truro property.
Pamet Harbor & the Valleys
Truro's Pamet River valley and small harbor give the town an intimate, sheltered feel. A detached cottage or in-home conversion fits naturally into that low-density pattern.
A Small Year-Round Town
Truro's tiny year-round population struggles to house the workers and families who keep the town running. A year-round ADU rental directly supports that community in a place where new construction is tightly limited.
The Rules, In Brief
Truro ADU rules at a glance
How the statewide ADU law applies in Truro — and what still gets decided locally.
By-Right, Statewide
Since February 2025, a first ADU is permitted by right in single-family zoning under the Affordable Homes Act, with no owner-occupancy mandate.
Size Limits
By-right ADUs are limited to 900 square feet or half the primary dwelling's floor area, whichever is smaller.
Seashore Review
Because so much of Truro lies within the National Seashore, projects near protected land can involve additional setback and review considerations beyond standard zoning.
Septic & Water
Truro depends on private wells and septic in much of town. System capacity is frequently the deciding factor in ADU design and is best evaluated up front.
Local Knowledge
What to think about for a Truro ADU
Truro's defining constraint is land — or the scarcity of it. With the National Seashore covering most of the town, the practical question is rarely whether you'd like an ADU and usually how to fit one within conservation setbacks, well and septic capacity, and the town's low-density character. That can favor converting existing space or adding a compact detached cottage over a larger build. We approach Truro projects by reading the specific limits of your parcel first, then designing to them — so the result is a unit that honors the landscape and can actually be permitted.
Permitting an ADU in Truro typically involves the Truro Building Department, the Truro Board of Health for septic review, and where a project calls for it, the Planning Board or Zoning Board of Appeals. We prepare the package and represent the project through that process as part of every job.
Common Questions
Truro ADU questions we get asked
Do I need a special permit to build an ADU in Truro?
Under the Massachusetts Affordable Homes Act, a first accessory dwelling unit is allowed by right in single-family zoning, which means a special permit is generally not required for that first unit. You still need a building permit, and Truro still applies its own setback, height, and lot coverage rules. Second units, oversized units, or properties in overlay districts may require additional local review. We confirm the current requirements with the town as part of every project.
How big can an ADU be in Truro?
The by-right cap is 900 square feet or 50% of the primary dwelling’s floor area, whichever is smaller. On a modest Truro home, the 50% figure is often the binding number rather than the 900 square feet — which is why we measure the existing house early instead of assuming.
Will septic or sewer limit an ADU on my Truro property?
Truro has no municipal sewer, so Title 5 septic capacity governs most Truro ADU projects. Truro lots are often large but constrained by slope, groundwater, and resource-area setbacks. We assess what your existing system can carry before recommending a unit size or location.
How long does an ADU project take in Truro?
Design and permitting typically run a few months, and construction depends on the type of unit and the season. Garage, basement, and attic conversions generally move faster than new detached construction. We give you a realistic schedule for your specific Truro property at the consultation rather than a generic range.
Can I rent out an ADU in Truro?
Long-term rental of an accessory dwelling unit is generally permitted. Short-term rental rules are set locally and vary meaningfully from town to town on the Lower Cape, so if short-term rental income is part of your plan, confirm current Truro rules before you build. We raise this early because it can change which design makes sense.
Let's Talk
Thinking about an ADU in Truro?
The first conversation is free. Tell us about your Truro property and what you are trying to solve — rental income, family space, or downsizing in place — and we will walk you through whether it makes sense, with a preliminary design before any estimate.
Start with a Free ConsultationVern Hatt · Licensed Construction Supervisor #CS62739 · Home Improvement Contractor #177590