Skip the redesign.
Go straight to permit.
Sequoia Lodges is a Massachusetts ADU design and engineering firm. We sell permit-ready, PE-stamped plan sets for Boston-area backyards — your own contractor builds from them.
- PE-stamped
- Plans from $3,500
- Filing-ready in ~2 weeks
Not an ADU? We also do structural engineering for additions, garages & load-bearing work.
Will an ADU fit your lot?
Send your address and we'll give you an honest read — usually within one business day. If it won't work there, we'll tell you.
Something went wrong sending your message. Please try again, or email us directly at [email protected].
No payment, no obligation. We reply within one business day.
Not a concept sketch — real drawings.
Browse all eight 1- and 2-bedroom floor plans in the collection, watermarked and dimensioned.
Permit-Ready
Every plan already meets BPDA and Article 53 requirements — no waiting on rounds of review comments.
Fast
Pre-designed means no blank-page design phase. Pick a plan and move toward permitting this week.
Reliable
Every set is coordinated with licensed Massachusetts architects and engineers before it reaches you.
We're an engineering firm before we're a plan shop — the ADU packages are our catalog work. We also take on structural engineering for other residential projects — additions, garages, load-bearing changes — by inquiry.
We drew this one. Someone else built it.
17R Harding Rd in Norwood is a two-bedroom ADU we designed — 756 square feet, two bedrooms, one bath. Our work was the drawings and the stamp; a contractor built it from them. It is finished, occupied, and was listed at $2,246 a month in January 2026.
“Permit-ready” is an easy thing to claim. This set went through a real building department and a real contractor, and came out the other end as a dwelling somebody lives in. More on ADUs in Norwood.
That rent is what this specific unit was listed at on that date — not a projection for your property. Rents vary by town, size, and condition, and we don't forecast them.
756 sf
2 bed · 1 bath
Design & engineering only
Built from our plans
Norwood, MA
Send us the address.
Tell us the property and what you have in mind. You'll get an honest read on whether an ADU fits — usually within one business day. If it doesn't work, we'll tell you that too.
[email protected]Straightforward pricing. No surprises.
| Plan | Approx. Size | Investment | Includes |
|---|---|---|---|
| Studio ADU | 400–550 sf | $3,500 | Complete plan set, BPDA-compliant design |
| 1-Bedroom ADU | 550–750 sf | $4,000 | Plan set + structural engineering |
| 2-Bedroom ADU Most Requested | 800–900 sf | $4,500 | Plan set + full structural engineering — largest layout |
Site-specific tailoring is included with every plan. Larger custom modifications — different footprints, added levels, accessibility features — are available by inquiry.
Not a concept sketch — real drawings.
Browse all eight 1- and 2-bedroom floor plans in the collection, watermarked and dimensioned.
You no longer need a variance to build an ADU in Massachusetts.
Under the Affordable Homes Act, ADUs under 900 sq ft are now allowed by right in single-family zoning districts statewide — no special permit, no zoning board. Boston has its own citywide path under Article 53. Either way, the old “will the town even let me?” question is answered.
One backyard. Three good reasons.
Rental income
Boston-area rents are among the strongest in the country. A permitted ADU turns unused yard space into a long-term income stream.
Room for family
An in-law suite for aging parents, a landing spot for adult kids, or a home office — independent space without leaving the property.
Property value
A second permitted dwelling on the lot is a durable improvement — one buyers and appraisers both recognize.
A complete plan set, ready to file.
Every Sequoia Lodges package is a full drawing set — the same documents a custom architect would produce over months, ready on day one.
Published by The ADU Exchange, a New England ADU network. Sequoia Lodges is a design partner.
Dimensioned floor plans
Fully dimensioned layouts for every level, drawn to scale and ready for your contractor.
Exterior elevations & building sections
All four elevations plus cross-sections showing heights, materials, and structural details.
Structural engineering
Included with 1-bedroom plans and up — stamped-ready framing and foundation design.
General notes & construction details
Cross-sections, notes, and detail sheets — everything your contractor needs to bid and build.
BPDA & Article 53 compliance notes
Documentation mapping the design to Boston's ADU requirements, so review goes smoothly.
An engineering design firm. ADUs are what we're known for.
Sequoia Lodges is a Massachusetts engineering design firm. Our catalog work is ADUs — getting Boston-area homeowners from idea to permit-ready plans without the cost and delay of custom design — and we take on structural engineering for other residential projects by inquiry.
Design and site-specific engineering are led by our principal engineer, and every plan set is coordinated with licensed Massachusetts architects and engineers who know Boston's Article 53 and BPDA requirements first-hand.
We serve Boston, Cambridge, Newton, Brookline, and surrounding Greater Boston communities.
Sequoia Lodges is a design partner of The ADU Exchange, a New England-wide network connecting homeowners with vetted ADU trades, lenders, and legal professionals.
Structural engineering for the rest of the house.
The ADU plan sets are our catalog product, but the engineering behind them isn't ADU-specific. If your project needs the structural piece drawn and stamped, we'll quote it.
Foundation plans
Footings, walls, and slab design sized for the loads above them.
Framing plans
Floor, wall, and roof framing laid out and specified.
Beam & header sizing
Calculations and details for new openings and carried loads.
Sections & details
Cross-sections and construction details your contractor can build from.
Scope and fee are quoted per project — this work isn't part of the fixed ADU packages above. We don't build, and we don't take on MEP, surveys, or site plans.
Send Us the ProjectThree steps. No guesswork.
Pick a plan
Studio, one-bedroom, or two-bedroom — browse the set that fits your lot.
We tailor it to your lot
Site-specific adjustments, handled by our principal engineer.
File for permit
You receive a complete, permit-ready set — no further redesign needed.
Typical timeline from plan selection to a filing-ready set. Site conditions and survey availability can affect schedule.
Common questions.
Are your ADU plans permit-ready?
Yes. Every plan is designed to meet BPDA and Article 53 requirements and is ready to submit for permit, so you skip months of custom design work.
What is included in a plan set?
Every set includes dimensioned floor plans, exterior elevations, foundation and structural framing plans, cross-sections, construction details, and compliance notes — PE-stamped and ready to submit. MEP (mechanical, electrical, plumbing) drawings are not required for residential permitting and are not part of the base set.
Can the plans be adjusted to fit my lot?
Yes. Site-specific adjustments are part of every engagement and are handled by our principal engineer. Larger custom modifications are available by inquiry.
How fast can I get started?
Because our plans are pre-designed, there is no blank-page design phase. Most clients are moving toward permitting within days of selecting a plan.
What areas do you serve?
We serve Boston, Cambridge, Newton, Brookline, and surrounding Greater Boston communities across Massachusetts.
Do you build the ADU too?
No — we're a design and engineering firm, not a construction company. You receive a complete, permit-ready plan set and your contractor builds from it. That separation keeps our pricing fixed and our recommendations honest.
Let's get your plans moving.
Tell us about your property and we'll help you pick the right plan — usually within one business day.