Lexington, MA Home Improvement Contractor | Additions & Remodeling
A successful Lexington addition begins with the property—not a generic floor plan. Existing structure, zoning, gross floor area, natural grade, utilities, and the way new work connects to the original house all affect what can be built and what it will cost.
Colony Home Improvement provides design-build planning for additions and major renovations. If you are considering a second story, family-room addition, larger kitchen, home office, or primary suite, request a project consultation and quote.
Home Improvement Services for Lexington Homeowners
Colony is a Lexington home improvement contractor for additions and renovations that require coordinated design, permitting, structural work, and finish construction. The goal is to solve the homeowner’s space or layout problem while respecting the existing house.
- Home additions and second stories for bedrooms, offices, family rooms, primary suites, and expanded living areas.
- Kitchen remodeling involving layout changes, cabinetry, lighting, flooring, and integration with an addition.
- Bathroom remodeling for existing rooms, new suites, and bathrooms added within larger projects.
- Sunrooms and light-filled living additions planned around the home, lot, and year-round use.
- Design-build renovation planning that connects feasibility, budget, permits, and construction.
Not sure which type of project best solves the problem? Describe what your Lexington home needs, and we can help identify the next step.
Actual Colony Project: A 26' × 33' Two-Story Addition in Lexington
Colony’s project archive documents a Lexington addition that was larger than the original house. The work replaced an existing rear two-story addition and deck with a new 26-by-33-foot structure containing a full basement, first floor, and second floor.
- Program: two bedrooms and a full bathroom upstairs; an expanded kitchen, home office, family room, and full bathroom on the first floor.
- Existing-condition challenge: after demolition, the team found a concrete-block foundation wall sitting above a rubble wall. The existing basement wall was supported and reinforced as the new foundation was built.
- Envelope and drainage: the new foundation received waterproofing, below-grade exterior insulation, and a French drain.
- Roof integration: the rear dormer roof was raised, a structural ridge was installed, and the new roof was tied into the addition.
- Completion: the project included the extended kitchen, new family room and bedrooms, two full bathrooms, a masonry side entrance with bluestone landing and steps, columns, and a patio.
View all 24 construction and completion photos from this Lexington project.
What Does a Home Addition Cost in Lexington?
Cost depends on the addition type and the house it must connect to. A ground-level family room, a partial second story, and a full two-story addition with basement and bathrooms are not comparable scopes.
For second-story planning, Colony’s current Massachusetts guide places many projects in a broad $300,000 to $600,000+ range. It lists partial second stories below many full second-story projects, while noting that major structural upgrades and high-end specifications can move costs higher. Read the assumptions in our Massachusetts second-story addition cost guide. This is a statewide planning range, not a price for a specific Lexington home.
Major cost drivers include foundation and framing capacity, roof removal and weather protection, stair and first-floor reconfiguration, kitchens and bathrooms, HVAC and electrical upgrades, site access, and finish selections. A defined concept and property review are required for a meaningful budget.
Lexington Permits, Zoning & Design Constraints
Lexington’s official zoning page explains that zoning controls land use as well as the size and location of buildings. The Building Department administers and enforces zoning; projects that cannot comply as proposed may require review by the Zoning Board of Appeals.
For an addition, expect the planning conversation to address:
- zoning district, setbacks, height, site coverage, and any applicable dimensional controls;
- a residential plot plan and the town’s methods for calculating average natural grade, elevations, and gross floor area for additions;
- structural plans and energy-code documentation;
- electrical, plumbing, gas, and mechanical permits where the scope requires them; and
- whether the property or proposal triggers a special permit, variance, site-plan issue, or another review.
Lexington’s Building Office says permit applications are submitted through its online OpenGov system. Its current guidance also notes Lexington’s participation in the Municipal Fossil Fuel Free Building Demonstration Program, which may affect new construction and qualifying major renovations. Confirm the current requirements with the town for your scope.
The town’s linked residential building-permit checklist identifies materials commonly required for additions, including a proposed plot plan, permit worksheet, gross-floor-area information, owner authorization, and plans. Municipal information on this page was reviewed in August 2026.
How Long Does a Lexington Addition Take?
There is no reliable town-wide construction duration. The schedule is built from feasibility and zoning review, design and engineering, permit review, selections and procurement, and construction. Structural complexity, additional local review, long-lead materials, weather, and how much existing space must be altered all affect the result.
The practical step is to establish feasibility before promising a construction date. Colony’s design-build process keeps the proposed design, construction details, and budget connected while the schedule is developed.
Can I Build a Second Story on My Lexington Home?
Possibly. The decision requires both a structural answer and a zoning answer. A design team needs to evaluate the foundation and load path, the roof-removal and weather-protection plan, stair location, first-floor changes, building height, gross floor area, setbacks, site coverage, and mechanical capacity.
A Colonial may accept a full-width or rear two-story expansion if the site and structure allow it. A Cape may gain space through dormers or a larger second-floor redesign, but roof geometry and headroom drive the solution. A ranch can gain major square footage vertically, though foundation capacity, stairs, and exterior proportions must be resolved. These are design tendencies, not guarantees for a particular property.
Explore Colony’s two-story addition service and before-and-after project library for related examples.
Lexington Home Addition FAQs
Do I need a building permit for an addition in Lexington?
Yes. An addition requires a building permit, and the electrical, plumbing, gas, and mechanical portions may require their own permits.
Does Lexington require a plot plan?
The town’s residential addition guidance lists a proposed plot plan and provides specific resources for residential plot-plan requirements and related zoning calculations.
Could my project need zoning relief?
It may if the proposed design does not comply with the zoning rules applicable to the property. The Building Department handles administration and enforcement; the Zoning Board of Appeals handles certain special permits and variances.
Can the existing kitchen or first floor be remodeled with the addition?
Yes. The documented Lexington project expanded the kitchen and added a family room, office, and bathroom on the first floor while adding bedrooms and a bathroom upstairs.
Plan Your Lexington Addition or Remodel
A useful first conversation covers the property, desired space, early zoning questions, budget expectations, and timing. Colony can help turn those inputs into a buildable scope.
