Wellesley, MA · About 5 mi from our Waltham shop
Additions and rebuilds that clear Wellesley's reviews
In Wellesley a big addition or a new house can need Large House Review, which the town says generally runs three to four months from submission to building permit. Knowing that before design starts is half the schedule.
How Wellesley works
The Planning Department sees most big projects before the Building Department does.
Wellesley's Planning Department staffs the Planning Board, the Design Review Board, the Historic District Commission and the Historical Commission. For a large addition or a replacement house, that office is often the first stop, not the building inspector.
Large House Review looks at a home's Total Living Area plus Garage Space, or TLAG. If a new house goes over the threshold for its zoning district, or an addition grows TLAG by 10% or more and ends above it, the Planning Board has to approve the project after the Design Review Board and the Engineering Division weigh in.
Demolition review runs alongside it. A dwelling built on or before December 31, 1949 that is being demolished, or that loses or is enveloped across half or more of its exterior, goes to the Historical Commission. The town recommends starting that process early so it can overlap with Large House Review instead of following it.
Wellesley rules
Wellesley rules that change a project's scope or schedule.
Summaries of published town bylaws and guidance. Thresholds differ by zoning district and are revised at Town Meeting, so the Building and Planning Departments confirm what applies to your lot.
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Large House Review above the TLAG threshold
New homes over their district's Total Living Area plus Garage Space threshold, and additions that raise TLAG by 10% or more to a total above it, need Planning Board approval before a building permit. The applicant first files a TLAG affidavit and plans with the Building Department.
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Demolition review for pre-1950 dwellings
Demolishing, or removing or enveloping 50% or more of the exterior of, a dwelling built on or before December 31, 1949 requires Historical Commission review. If the house is found Preferably Preserved, a 12-month delay applies; interior changes and non-structural roofing and siding work are not subject to review.
Source: Wellesley Planning: Demolition Review Bylaw Information (Article 46C)
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Tree Bylaw protection plans
Wellesley's Tree Bylaw applies when a project demolishes a structure with a footprint of 250 square feet or more, builds on a vacant lot, builds regulated retaining walls, or adds 50% or more to the existing footprint. Protected trees sit in a Tree Yard along the lot lines whose depth depends on the zoning district.
Source: Town of Wellesley: Section 16E Tree Bylaw, rev. February 2021 (PDF)
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Specialized code for new homes
Wellesley adopted the Municipal Opt-in Specialized Energy Code effective January 1, 2024. It applies to new construction only; mixed-fuel buildings must be pre-wired for future electric equipment and, with some exceptions, include on-site solar.
Source: Wellesley Climate Action: Municipal Opt-in Specialized Energy Code
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Wetland buffer and 25-foot no-disturbance zone
Work within 100 feet of a wetland resource area, or 200 feet of a river, stream or vernal pool, may need a permit from the Wetlands Protection Committee. The 25 feet nearest a resource area is a no-disturbance zone, and grading, tree removal and new impervious surface all count as work.
Source: Wellesley Wetlands Protection Committee: Do I Need a Wetland Permit?
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Cottage Street and single-building historic districts
Wellesley's Historic District Commission reviews exterior alterations for the 65 properties in the Cottage Street Historic District and five Single Building Historic Districts. A certificate is needed before work on those exteriors begins.
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ADU design rules
Under Section 5.13 an accessory dwelling unit must match the main house's style, cannot raise its height, and cannot have its exterior door on an elevation facing a street. Exterior stairs must not be visible from a public way, and a notice of the ADU is recorded at the Registry of Deeds.
Source: Wellesley Zoning Bylaw Section 5.13, Accessory Dwelling Units (PDF)
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Sewer connection inspection
A new or rebuilt building sewer must be inspected by the DPW Engineering Division along its entire length, from the foundation to the public sewer, before it is backfilled. Pipe and fittings within 10 feet of the foundation are subject to the Plumbing Inspector's approval.
Source: Wellesley DPW: Sewer Service Connection Procedures and Specifications (PDF)
- Large House Review
- About 3–4 months
- Demolition review
- Homes built by 1949
- Specialized energy code
- Since Jan 1, 2024
- Local historic district properties
- 65 on Cottage St + 5 single-building
- Homes built (median)
- c. 1955
- Owner-occupied homes
- 84%
Housing figures: U.S. Census Bureau, ACS 2019–2023 5-year estimates.
Services
HouseCraft services in Wellesley.
Pick a service to see how Wellesley's bylaws apply to it, from the Tree Bylaw on additions to the ADU design rules on basement apartments.
Kitchen remodeling in WellesleyLayouts, cabinets, counters, plumbing & trim.
Bathroom remodeling in WellesleyTile, showers, tubs, vanities & plumbing.
Basement finishing in WellesleyFamily rooms, gyms, offices & guest suites.
Home additions in WellesleyFamily rooms, bedrooms, sunrooms & garages.
New construction in WellesleyNew homes and full rebuilds, start to finish.
Iron work in WellesleyStaircases, railings, gates & window guards.
Most delays on Wellesley jobs are review timing, not construction. We map the reviews before we set a start date.
Licensed and insured, based in Waltham, with free written estimates.
Questions
Wellesley questions from homeowners.
Does my Wellesley addition need Large House Review?
Only if it raises the home's Total Living Area plus Garage Space by 10% or more and the result is over the threshold for your zoning district. Changes to nonconforming homes that need a Zoning Board special permit are exempt from Large House Review.
Can the Historical Commission stop me from tearing down my Wellesley house?
It can delay, not stop. If a dwelling built by the end of 1949 is found Preferably Preserved after a hearing, Wellesley imposes a 12-month delay on the demolition permit, and the owner can ask for a waiver to shorten it.
Does the Wellesley Tree Bylaw apply to my renovation?
Only for certain projects: demolishing a structure with a footprint of 250 square feet or more, building on a vacant lot, building certain retaining walls, or adding 50% or more to the existing footprint.
Nearby towns we serve.
Where this information comes from
- Wellesley Building Department
- Wellesley Planning Department
- Wellesley Planning: Large House Review Information
- Wellesley Planning: Demolition Review Bylaw Information (Article 46C)
- Wellesley Building Department: Tree Bylaw Information
- Town of Wellesley: Section 16E Tree Bylaw, rev. February 2021 (PDF)
- Wellesley Planning: Accessory Dwelling Units
- Wellesley Zoning Bylaw Section 5.13, Accessory Dwelling Units (PDF)
- Wellesley Historic District Commission
- Wellesley Climate Action: Municipal Opt-in Specialized Energy Code
- Wellesley Climate Action Office: Article 36 summary, ATM 2023 (PDF)
- Wellesley Wetlands Protection Committee: Do I Need a Wetland Permit?
- Wellesley DPW: Sewer Service Connection Procedures and Specifications (PDF)
Rules change. These are summaries of Wellesley's and Massachusetts' published rules as of our last check, not legal advice; your project's permits are confirmed with the town when we file them.
Free estimate
Planning a Wellesley addition, rebuild or remodel?
We'll come out, measure, listen, and send a written estimate. The visit is free and there's no pressure to sign.
Call 617-934-1875