Room Additions & Home Additions

Add real square footage to your Greater Boston home — master suites, family rooms, sunrooms, in-law suites, and second-story additions. Full structural build with permits, inspections, and zero subcontractor handoffs.

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Licensed & Insured Greater Boston Free Estimates Permits Handled

Types of Additions

Every addition is a structural project — we handle the full scope from foundation to finish, including all permits required by your municipality.

Master suite addition Boston MA
Master Suite Addition

Add a primary bedroom with full en-suite bathroom, walk-in closet, and direct outdoor access. The most searched and highest-value addition in Greater Boston's single-family market.

Family room addition Boston MA
Family Room Addition

Expand your main living area with a rear or side bump-out. Open-concept integration with existing spaces, vaulted ceilings, large windows, and hardwood flooring to match.

In-law suite addition Boston MA
In-Law Suite & ADU

A self-contained living space with private entrance, kitchenette, and bath — for aging parents, adult children, or rental income. Massachusetts ADU law (Chapter 40A §3J) now makes permitting easier in most towns.

Second story addition Boston MA
Second Story Addition

Double your home's square footage without losing yard space. Full structural engineering, foundation assessment, roof removal and replacement — ideal for cape-style and ranch homes across Greater Boston.

Sunroom addition Boston MA
Sunroom & Four-Season Room

Fully insulated and conditioned four-season rooms that function year-round — not just three-season porches. Designed to handle New England winters with proper thermal framing and window systems.

Bump-out addition Boston MA
Bump-Out & Micro Addition

Add 100–300 sq ft to a kitchen, bathroom, or bedroom without full foundation work. Cantilevered bump-outs are a cost-effective way to gain meaningful space in tight lots common across Greater Boston.

Adding On in Massachusetts Takes Planning

Greater Boston's housing stock is older, lots are smaller, and zoning rules vary significantly town by town. An addition that's straightforward in one community requires a variance hearing in the next. We know the difference — and we handle the process for you.

What makes MA additions complex
  • Setback requirements vary by town — many lots in Newton, Brookline, and Cambridge have tight margins
  • Historic district review required in parts of Boston, Cambridge, Concord, and Lexington
  • Massachusetts energy code (IECC) requires insulation levels that exceed most other states
  • Frost line depth of 48 inches means all foundations need to go deeper than warmer climates
  • Older homes often lack the structural capacity to support a second story without upgrades
Why additions pay off in Greater Boston
  • Median home price in Greater Boston exceeds $700,000 — added sq ft returns strong value
  • Moving costs, transfer taxes, and inventory make staying and adding on the smarter financial choice
  • MA ADU law changes in 2024 removed many barriers to in-law and rental unit additions
  • Financing available — spread a $100,000+ addition over time at competitive rates
Room addition Greater Boston MA

How It Works

A room addition is the most complex residential project you can undertake. Here's how we keep it on track.

1
Site Assessment

We review your lot, existing foundation, setbacks, and zoning rules. You get an honest feasibility picture and budget range before any commitment.

2
Design & Engineering

Architectural drawings, structural engineering for beam and foundation loads, and energy compliance documentation — everything needed for permit submission.

3
Permits & Zoning

We file building, electrical, and plumbing permits. If a variance or ZBA hearing is needed, we manage the process and represent the project.

4
Full Build

Foundation, framing, roofline integration, insulation, mechanicals, drywall, and all finishes — one crew from start to finish with weekly progress updates.

5
Final Inspection

We schedule and pass all required municipal inspections — framing, insulation, electrical, plumbing, and final occupancy. You get a fully permitted, code-compliant addition.

Recent Additions

Completed room addition projects across Greater Boston.

Room addition — Highland MA

Home Addition

Highland, MA
Room addition — Highland MA

Structural Framing & Build

Highland, MA
Room addition — Highland MA

Finished Addition

Highland, MA
Room addition framing — Newton MA

Room Addition Framing

Newton, MA
Living room addition — Needham MA

Living Room Addition

Needham, MA
Finished addition — Wellesley MA

Finished Lower-Level Addition

Wellesley, MA
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What Boston Homeowners Say

4.9 ★ across 60+ reviews on Google

Common Questions

Room additions in Greater Boston typically run $200–$350 per square foot for a fully finished space, depending on complexity, finish level, and whether a bathroom is included. A 300 sq ft master suite addition runs roughly $80,000–$120,000 all-in. Second-story additions cost more due to structural engineering requirements. We provide a written, itemized estimate after the site assessment — no vague ranges.

All room additions require a building permit. If the addition includes plumbing, an electrical permit is also required, and plumbing work must be pulled by a licensed MA plumber. Most municipalities also require a plot plan showing the addition's footprint relative to property lines. We handle all permit applications and coordinate with your town's building department from start to final inspection sign-off.

It depends on your lot and proposed footprint. Many properties in Greater Boston are already at or near their maximum lot coverage or setback limits. If your proposed addition encroaches on a setback or exceeds lot coverage limits, a variance from the local Zoning Board of Appeals is required. We assess this in the initial site visit and manage the ZBA process if needed — it adds time but is very achievable for additions that fit the neighborhood character.

From permit approval to completed finish work, most single-room additions take 8–14 weeks. Second-story additions run 16–24 weeks. Permitting typically adds 4–8 weeks before construction starts, depending on your municipality and whether a variance is needed. We build a detailed schedule before any work begins so you know exactly what to expect at each phase.

Yes — Massachusetts Chapter 40A §3J, updated in 2024, requires most municipalities to allow one accessory dwelling unit (ADU) by right on any lot with an existing single-family home. This removes the ZBA variance requirement that previously blocked many in-law suites. Local design standards still apply, but the path to permitting is significantly clearer than it was before. We've built ADUs under the new law and can walk you through what's allowed in your specific town.

Boston, Newton, Brookline, Needham, Wellesley, Dedham, Milton, Quincy, Braintree, Weymouth, Cambridge, Somerville, Natick, Framingham, Medford, Malden, and surrounding Greater Boston communities. Contact us if you're outside this list — we often cover adjacent towns.

Get Your Free Site Assessment

We'll evaluate your lot, review zoning limits, and give you a clear picture of what's possible and what it will cost — no obligation, no pressure.

(857) 499-4440

info@elitecontractorsllc.biz

Serving Greater Boston

Licensed & Insured · Free Estimates · Financing Available · Credit Cards Accepted