See what a second story could look like on your home
Design Build Boston helps Greater Boston homeowners expand up, not out. AI rendering in seconds. Real cost estimate from a licensed local builder. Free — no commitment.
See How Second Story Additions Work — Watch This First
Licensed & Insured
Serving Greater Boston
50+ Projects Completed
4.9 Star Average
AnotherStoryOS Certified
How It Works
Three steps from curiosity to commitment — all without leaving your home or making a payment.
01
📍
Enter Your Address
Tell us where you live. Our AI pulls your home's photo from Google Street View and starts analyzing the structure and neighborhood context.
02
🎨
Pick Your Style
Choose from 15 architectural styles — Modern, Colonial, Victorian, Craftsman, and more. Our AI renders your home with the new second story in minutes.
03
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Get Your Estimate
See a market-grounded cost range for your specific address, neighborhood, and home type. Then book a free consultation with our team directly.
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Ask Me Anything About Second Story Additions
Not sure where to start? Our AI engine answers your Boston-specific questions — pricing, historic district rules, permit timelines — and captures your lead so our team can follow up personally.
"Not sure where to start? Ask me anything about second story additions in Greater Boston."
Leads captured here are routed directly to Design Build Boston →
Service Areas
Design Build Boston serves Greater Boston's most desirable neighborhoods — and knows the local permit and zoning landscape inside and out.
Boston
Boston
Beacon Hill, Back Bay, South End, Jamaica Plain, Roslindale, and all Boston neighborhoods.
Cambridge
Cambridge
Historic district rules, Cambridge building codes, and neighborhood character.
Brookline
Brookline
Strict height restrictions, Brookline planning board, and historic sensitivity.
Newton
Newton
Zoning variances, Newton city permits, and residential zone requirements.
Somerville
Somerville
Dense neighborhoods, Somerville Inspectional Services, and ARD requirements.
Arlington
Arlington
Arlington planning and zoning, single-family residential overlays.
What Homeowners Say
Real projects, real neighborhoods, real people who stayed in their homes.
★★★★★
"We added 750 sq ft to our 1950s cape in Newton. The AI render showed us exactly what the project would look like before we committed. Design Build Boston handled the permit process with the city — I didn't make a single call to Newton city hall."
MR
Michael R.Newton — 750 sq ft addition, 2025
★★★★★
"Living through construction in Boston is never fun, but they made it as painless as possible. The first floor stayed dry and usable throughout. We're still in our house in Cambridge — didn't have to move to get the space we needed."
JL
Jennifer L.Cambridge — second floor addition, 2025
★★★★★
"Brookline's planning board is no joke. Design Build Boston knew exactly what we needed to submit and navigated the whole process. The second story looks like it was always there — you can't tell from the street."
ST
Sarah T.Brookline — master suite addition, 2024
Frequently Asked Questions
Honest answers to the questions Greater Boston homeowners actually ask.
Do I need a permit for a second story addition in Greater Boston?
Yes. Massachusetts requires a building permit for any structural addition, and Boston has its own Inspectional Services (ISD) process. Suburbs like Brookline, Newton, and Cambridge have their own permit offices and historic commissions. Design Build Boston handles all permit applications as part of the project — architectural plans, structural engineering, and required documentation. Permit timelines in Greater Boston typically run 6–10 weeks. We manage the entire process; you do not deal with the city yourself.
What is the average cost per square foot for a second story addition in Greater Boston?
As of 2026, Greater Boston second story additions run $325–$450 per square foot for mid-range finishes, with premium or historic-sensitive projects reaching $550+. Boston is one of the most expensive construction markets in the country due to labor costs, material logistics, and regulatory complexity. A typical 800–1,000 sq ft addition — adding a master bedroom, bath, and home office — typically runs $290,000–$420,000 fully finished. We provide a detailed, market-grounded estimate after reviewing your specific address and home type.
Can I add a second story to a one-story house in Massachusetts?
Usually yes — but it depends on your foundation, existing structure, and neighborhood zoning. Most homes built after 1950 in Greater Boston have foundations that can be reinforced to support a second floor. Victorian and historic homes in Back Bay, Beacon Hill, and Cambridge require extra scrutiny. We start with a structural assessment ($1,000–$2,500) to confirm whether your home is a good candidate. We also check for any historic district review requirements or HOA restrictions.
How long does a second story addition take in Greater Boston?
Most projects run 6–8 months from permit approval to final walkthrough. Permits take 6–10 weeks in Greater Boston; historic review (if applicable) adds 4–8 weeks. Framing and weatherproofing takes 8–10 weeks; finishing (drywall, electrical, plumbing, paint) takes another 12–16 weeks. You live in your home throughout construction — we weatherproof the new second floor before removing the old roof, so your first floor stays dry and habitable throughout.
Will my homeowners insurance cover a second story addition?
Typically not the addition itself, but many policies cover your contents during construction if you have proper rider coverage. Once the addition is complete and permitted, you must update your policy — the additional square footage and upgraded structure significantly increases your coverage requirement. Massachusetts homes in flood zones or coastal areas may also need to address flood insurance implications. We provide documentation to help with those conversations.
What zoning restrictions apply to second stories in Greater Boston?
Zoning varies significantly across Greater Boston municipalities. Brookline and Cambridge have strict height restrictions and setback requirements. Newton has varying residential zones. Boston neighborhoods (South End, Jamaica Plain, Roslindale) each have their own planning and zoning rules. Historic districts in Beacon Hill, Back Bay, and Cambridge add an additional review layer. We research your specific property address during the initial consultation and flag any zoning or historic review constraints before you commit.
What's the ROI on a second story addition in Greater Boston?
A well-executed second story in Brookline, Cambridge, or Newton typically recoups 65-75% of its cost in increased home value, according to Remodeling Magazine and local realtor assessments. More importantly, Greater Boston real estate means staying in your home avoids enormous transaction costs — Boston metro realtor fees plus closing costs run $60,000-$120,000 on a typical home sale. For families in Cambridge or Brookline who want more space, the math for adding a second story is compelling.
Does Design Build Boston handle the design and architecture?
Yes. We have an in-house design team and work with licensed architects for projects requiring stamped drawings or historic commission approval. We handle the full scope: concept design, architectural drawings, structural engineering, permit submissions, and construction. We work across Back Bay, Beacon Hill, Cambridge, Brookline, Newton, Somerville, and surrounding Greater Boston communities.
Can I live in my home during construction?
Yes. This is one of the main advantages of the second-story approach vs. moving. We weatherproof your new second floor before removing the old roof, so your first floor stays dry and habitable throughout. You maintain full access to your kitchen, bathrooms, and bedrooms on the ground floor. We coordinate work schedules to minimize disruption to your daily routine. Massachusetts winters add planning considerations — we plan the weatherproofing phase carefully around seasonal weather.
Is there a payment schedule or financing option?
We structure projects with a draw-based payment schedule tied to construction milestones (permit approval, framing completion, weatherproofing, final walkthrough). We also work with lenders who offer construction loans that convert to standard mortgages upon completion. Given Boston-area construction costs, we recommend discussing financing options during your initial consultation so you understand the full financial picture before committing.
Ready to See Your Home's Potential?
Get a free AI rendering of your Greater Boston home with a second story — no commitment, no pressure. Our team follows up personally with a real estimate.