Additions
4.9 on Google · 4,000+ Projects Completed

More Space, Built Right Into Your Home

Home Additions in Hyannis, Cape Cod & the South Shore

Room additions, dormers, second stories, and sunrooms framed, roofed, and finished to match the house you already have. Permits, inspections, and weather-tight detailing handled by us.

Local crew, local priceFully licensed & insured (MA)Bonded roofing company

MA HIC #211166  ·  MA CSL #CS-122698

Someone from our team calls you back in under 5 minutes.

GAF Certified Plus
BBB Accredited Business
National Association of Home Builders
Home Builders & Remodelers Association of Cape Cod

$1,000 off every new addition booked this summer

GAF Certified Contractor Fully Licensed & Insured BBB Accredited Business

Homeowner Feedback

Hear From Our Customers

View All Videos →

Roberto, Project Planner

A walkthrough of a finished siding, roof, trim and decking project, with the homeowner on camera.

Dan & Jennifer

The Coastal team was professional from start to finish. Our new roof looks incredible and we could not be happier with the result.

Doug

Coastal delivered exactly what they promised, on time and on budget. Our new cedar roof is beautiful and the quality of the work speaks for itself.

Frank & Annie

From start to finish, everything turned out beautifully. The Coastal crew treated our home like their own and the new cedar siding looks incredible.

Andrew

Hear Andrew's experience working with Coastal Roofing & Siding.

Mary

Hear Mary's experience working with Coastal Roofing & Siding.

Kerry

Hear Kerry's experience working with Coastal Roofing & Siding.

Scott

Hear Scott's experience working with Coastal Roofing & Siding.

Sean

Hear Sean's experience working with Coastal Roofing & Siding.

Michael

Hear Michael's experience working with Coastal Roofing & Siding, at his home in Provincetown.

Roberto, Project Planner

A walkthrough of a finished siding, roof, trim and decking project, with the homeowner on camera.

Dan & Jennifer

The Coastal team was professional from start to finish. Our new roof looks incredible and we could not be happier with the result.

Reviews

What Homeowners Say

Google

4.9 out of 5 from 108 Google reviews

See the profile
Google

“I recently had the pleasure of working with Lucas and his team at Coastal Roofing & Siding for a reshingling project on my roof, including siding and trim repair, and I can't recommend them enough. From start to finish, Lucas was incredibly responsive and transparent about the process. The pricing was fair, no games or unexpected surprises, which is a breath of fresh air in the industry. The attention to detail from Lucas’s team was second to none. They were punctual, courteous, and made sure everything was spotless after finishing up. The quality of workmanship truly stands out – my roof has never looked better! Lucas and Coastal Roofing & Siding are the real deal. Highly recommended for anyone who values professionalism, quality, and straightforward service.”

Tim Ricciardi

2024

Google

“I cannot rave enough about Lucas and Coastal Roofing & Siding! We had been working on our new build addition for almost 3 years, and were running into problem after problem with contractors. We found Lucas and the ball started rolling. Knowledgeable, prompt, and transparent; he offered us a great price and his crews did beautiful work. I’ve attached before and after photos so you can see what they began with and how amazing they made our home look. We will be using Coastal for all our future building needs!”

Tegan DeBaggis

2025

Google

“We did not get a chance to hire them for work, but just want to praise this company and Roberto in particular. We are in the middle of adding an addition and Roberto came and gave us a quote. He CALLED when he was running late. I appreciate not being left waiting! It's very responsible. We ended up running into a budgeting problem on our end. So we'll do our roofing ourselves, but if we could use someone, I would recommend this company hands down! Thank you for being so accommodating!”

Jasmine Foster

July 2026

Google

“Reliable, trustworthy, prompt, easy to work with, professional. Lucas and his team transformed a leaky, unattractive old house into a gorgeous home. We recommend him without reservation. We are thrilled!”

Wild Braid

2024

Google

“I called Lucas to have a Ridge cap replaced on my roof and his opinion of the overall condition of the shingles.Lucas came by looked over the roof’s condition and sent me an estimate. We agreed to have job done and it was completed within a week and exactly what it was quoted for. The work was completed in a professional manner and exactly what we agreed on. Very happy with the completed job”

Neil Lazzaro

2024

Google

“Lucas with Coastal Roofing and Siding provided me with a reasonable estimate. His crew showed up on time, and did a great job. Highly recommended!”

Brian Davis

2024

Google

“I recently had the pleasure of working with Lucas and his team at Coastal Roofing & Siding for a reshingling project on my roof, including siding and trim repair, and I can't recommend them enough. From start to finish, Lucas was incredibly responsive and transparent about the process. The pricing was fair, no games or unexpected surprises, which is a breath of fresh air in the industry. The attention to detail from Lucas’s team was second to none. They were punctual, courteous, and made sure everything was spotless after finishing up. The quality of workmanship truly stands out – my roof has never looked better! Lucas and Coastal Roofing & Siding are the real deal. Highly recommended for anyone who values professionalism, quality, and straightforward service.”

Tim Ricciardi

2024

Google

“I cannot rave enough about Lucas and Coastal Roofing & Siding! We had been working on our new build addition for almost 3 years, and were running into problem after problem with contractors. We found Lucas and the ball started rolling. Knowledgeable, prompt, and transparent; he offered us a great price and his crews did beautiful work. I’ve attached before and after photos so you can see what they began with and how amazing they made our home look. We will be using Coastal for all our future building needs!”

Tegan DeBaggis

2025

More Living Space
Seamless Match
Permits Handled
Market Value

Why It Matters

Add the Space You Need Without Leaving the Home You Love

Outgrowing a house on Cape Cod and South Shore does not have to mean moving. A well-planned addition gives you the room you need, whether that is a bigger kitchen, a first-floor bedroom, a home office, or a second story on a small ranch.

The hard part of an addition is not the new space, it is where the new meets the old. We frame, roof, flash, side, and trim the connection so the addition sheds water like the rest of the house and looks like it was always there. We handle the permitting and inspections from start to finish.

What We Do

Additions Services

Room & Kitchen Additions

Bump-outs and full room additions that expand your living space with a foundation, framing, and finishes built to code.

Dormers & Second Stories

Turn a cramped attic or a low ranch into real living space with shed dormers, gable dormers, or a full second floor.

Garages & Breezeways

Attached garages, breezeways, and mudrooms framed and finished to match the existing roofline and siding.

Sunrooms & Porches

Three-season rooms, screened porches, and covered entries that make the most of the yard you already have.

Recent Work

See It For Yourself

Why Choose Us

What Sets Us Apart

Honest From Day One

No upselling, no scare tactics. We tell you exactly what your home needs and give you a fair price.

Same Crew, Start to Finish

The team that gives you the quote is the team that does the work. No subcontractors, no surprises.

15-Year Workmanship Warranty

We stand behind every project with a written 15-year warranty on labor. Not many contractors on Cape Cod and South Shore can say the same.

GAF Certified Contractor

Our certifications guarantee you are working with a trained, accountable team and unlock enhanced warranty options.

On Time, Every Time

We respect your schedule. Projects start when we say they start, and we communicate every step of the way.

Premium Materials Only

We only install products we trust, from GAF to James Hardie, built to last on the Cape.

Honest From Day One

No upselling, no scare tactics. We tell you exactly what your home needs and give you a fair price.

Same Crew, Start to Finish

The team that gives you the quote is the team that does the work. No subcontractors, no surprises.

How It Works

Our Process

01

Free Estimate

We come to your home at no cost. If there is a problem, we inspect it and give you an honest evaluation.

02

Clear Quote

A detailed written estimate with no hidden fees. You know exactly what you are paying for.

03

Scheduling

We work around your schedule. Once you approve, we lock in a date and confirm in writing.

04

The Work

Our crew handles everything, with a project manager accountable for the job from the first day to the last.

05

Final Quality Check

We run a final quality inspection on every project, walk it with you if needed, and leave the job site clean.

FAQ

Common Questions

Get a Free Addition Estimate

Let's Talk About Your Project

100% free estimate, no obligation
Clear, line-item pricing - no hidden costs or surprises
Premium materials built to withstand Cape Cod and South Shore weather
Backed by our 15-year workmanship warranty
Our team will respond within one business day

© 2026 Coastal Roofing & Siding - All rights reserved. Proudly serving Cape Cod and South Shore, MA.