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Decks & Porches · Lexington, MA

Decks & Porches in Lexington, Massachusetts

Compare contractors serving Lexington, Middlesex County — call them directly, or send one request and let the ones who want the job come to you.

30 contractors serving Lexington — including 4 based in town.

Contractors serving Lexington

Claimed listings within 5 miles come first, then the rest by rating, then distance. Google ratings as of October 2026. How we list and rank contractors

Decks & Porches in Lexington — what to know

Rebates & incentives

Decks and porches are not eligible for Mass Save rebates. Lexington is in Eversource territory, but energy rebates do not apply to outdoor structures.

Lexington has wetland resource areas associated with the Vine Brook, Mill Brook, and various ponds and mapped inland wetlands throughout town. The Lexington Conservation Commission reviews Notices of Intent for any deck within 100 feet of those resources under the Wetlands Protection Act. In addition, properties in or near the Lexington Center Historic District and the Battle Green area may require review by the Lexington Historic Districts Commission for any exterior addition. This applies to relatively few residential parcels but is worth checking for center-town properties. Frost-line footings to 48 inches are standard in Middlesex County.

Permits in Lexington

Building permits for decks in Lexington are filed with the Lexington Building Department under 780 CMR. Standard checkpoints include footing depth (48 inches), ledger-board attachment with through-bolts and metal flashing, 36-inch guardrails, and baluster spacing under 4 inches. Lexington's building department handles a solid volume of residential deck applications and turns permits around in about one to two weeks. For properties near the historic district, the Historic Districts Commission application should be submitted concurrently.

Where a permit is required, decks & porches work in Lexington is filed with the Lexington Building Department; see the Lexington Building Department’s contact, portal and who pulls the permit on permits.llc.

Typical project cost

Deck costs in Lexington are at the upper end of the Middlesex County range, consistent with the town's high home values and contractor market. Pressure-treated pine decks run $22 to $34 per square foot installed; composite or PVC systems (Trex, TimberTech, Azek) run $35 to $55 per square foot. A large composite deck (400 to 600 square feet) on a Lexington colonial runs $40,000 to $70,000. Screened and three-season porch additions start around $40,000 and scale with size. Most Lexington homeowners choosing composite decking opt for higher-end profiles in capped composite or PVC for longevity.

About Lexington homes

Lexington is a Middlesex County town of about 34,221 people with roughly 12,727 housing units and a median home age of 63 years. The town is known for its high home values and well-maintained housing stock, with colonials, Capes, and contemporaries on generous lots throughout the residential neighborhoods. Lexington borders Arlington, Waltham, Burlington, Belmont, and Lincoln.

The typical Lexington deck project involves a house from the 1960s or 1970s with an original pressure-treated deck that is now well past its optimal life, or a homeowner reinvesting in a property with high equity by upgrading to composite decking and a larger porch footprint. Lot sizes in Lexington are generous enough for substantial decks and screened porches.

Common questions — Decks & Porches in Lexington

My Lexington house is near the Vine Brook. Do I need Conservation Commission approval for a new deck?
If the deck falls within 100 feet of the Vine Brook or any mapped wetland, yes. File a Notice of Intent with the Lexington Conservation Commission under the Wetlands Protection Act before the building permit is issued.
Is there a historic district in Lexington that affects deck approval?
Yes. The Lexington Center Historic District and the Battle Green area are locally regulated, and exterior alterations to properties within those districts require Lexington Historic Districts Commission approval. Most residential subdivisions outside the center are not affected, but it's worth verifying with the building department.
My 1965 Lexington colonial has a large deck that's 40-plus years old. Is full replacement necessary?
On a deck that age, full replacement of footings, framing, decking, and railings is almost always the right call if the structure has significant decay or if the railings don't meet current 780 CMR code. Partial repairs on old framing tend to buy only a few more years before the same conversation happens again.
What composite decking options do Lexington contractors typically recommend?
In the Lexington market, capped composite (Trex Transcend, TimberTech AZEK) is the standard choice for homeowners doing a full rebuild. The fully capped surface resists staining and fading better than uncapped composite and carries the best manufacturer warranties, typically 30 years.
What does a screened porch addition cost on a Lexington colonial?
Screened porch additions in Lexington run $40,000 to $65,000 depending on size, framing, and finish. Three-season porches with insulated glazing run higher, typically $55,000 to $90,000. Both require a building permit from the Lexington Building Department.

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