Our passion is your legacy.
Expert Home Addition Contractor in Portland, ME
A home addition done right looks like it was always part of your home, with the same roofline, siding, trim, and quality. We design and build seamless additions for homeowners across Greater Portland and Southern Maine, managing every phase from architectural design and structural engineering through construction and finished interiors, all while you continue living in your home.
A home addition is not just more square footage. It is a structural integration that has to match your home architecturally and perform for decades.That distinction is where most additions succeed or fail. Legacy Construction has built additions that are indistinguishable from the original structure — roofline, siding, trim, and all.
What we bring to every project:
- We show up when we say we will
- We build exactly what we said we'd build
- We never leave a project unfinished
25+
years of construction experience
250+
completed projects since 1997
$300M
in commercial projects managed
Our passion is your legacy.
Hear from some Southern Maine
homeowners we've helped
Watching our home transform through this addition was incredible. Legacy Construction communicated clearly, respected our space and vision, and delivered work that feels solid and intentional. You can tell they care about doing things the right way—and building work that lasts.
Jennifer C.
Legacy Construction built an addition onto our home, and the quality is outstanding. The new space blends perfectly with the original house. They worked with us on budget and design and were always upfront about costs and options. Very professional from start to finish.
Savannah B.
From the first meeting, Legacy Construction was honest, professional, and easy to work with. They walked us through budget, design, and expectations clearly and followed through on everything. The end result is a beautifully built space that feels solid and well thought out.
Mehak K.
Southern Maine service areas
Don't see your town listed above? Call us anyway and we'll still come to you!
Built to match. Built to last. Structural integration done right.
Every addition we build is designed to match your home architecturally and perform structurally. We manage the full project so you stay focused on your life, not your job site.
Site Visit, Design, and Full-Scope Construction
It starts with a site visit where we evaluate your lot, discuss intended use, and identify setback constraints, drainage, and utilities. We design around your specific needs — whether that is a two-car heated garage, a multi-bay collector space, or a structure with attic storage above. Joe Hausler reviews every plan personally before we build. Every garage includes excavation to four-foot frost depth, foundation, framing, roofing, siding matched to your home, electrical, overhead doors, and concrete flatwork.
Commercial-Grade Planning for Your Garage Build
Joe Hausler spent 15 years managing commercial builds up to $300 million before founding Legacy Construction. He brings those planning systems and quality control standards to every custom garage we build in Southern Maine. Every garage gets a fixed-price contract before we break ground, a five-year workmanship warranty when we walk out, and Tim Schofield's finish carpentry on every interior detail. Most builders cannot say any of those three things. We can say all of them.
Cost, Timeline, and What a Legacy Garage Delivers
Custom garages in Southern Maine typically range from $55,000 for a standard two-car build to $150,000 or more for a multi-bay heated space with premium finishes. Timelines run eight to fourteen weeks from groundbreaking to walkthrough. Legacy Construction provides a fixed-price contract before breaking ground and backs every garage with our 1-year materials, 2-year systems, 5-year workmanship, and 10-year structural warranty package. We recommend starting design in late winter so construction begins in spring and wraps before fall.
We coordinate all permits, schedule every inspection, and manage the full project so nothing falls through the cracks on your property. Contact us to start planning yours.
Count on Legacy Construction for your Home Addition Contracting needs
Customer Satisfaction
We offer a 2-year warranty on all of our work, so you can have peace of mind knowing it'll be done right the first time.
Built on Repeat Business
70% of our clients come back for another project. That kind of return rate tells you more about our work than any sales pitch could.
Full-Scope Construction
No matter the scope or scale of your project, we handle every phase of the build from start to finish with our own crew on site.
Insured and Accountable
We carry full insurance on every project we take on, and we put our 2-year warranty in writing so you know exactly what backs the work.
Our easy 3-step process for perfect Home Addition Contracting
1
ARRANGE YOUR ADDITION CONSULTATION APPOINTMENT.
Contact us to discuss your space requirements, budget considerations, and existing home conditions so we can design an addition that works with your property.
2
WE'LL CONSTRUCT YOUR SEAMLESS ADDITION.
Our team executes construction with structural precision, architectural matching, and careful management of your occupied home throughout the project.
3
ENJOY YOUR EXPANDED HOME IMMEDIATELY.
We deliver your finished addition with architectural harmony, completed on schedule and built to look like it was always part of your home.
Frequently asked questions regarding Home Addition Contracting
Do you need a permit for a home addition in Southern Maine?
Yes. Home additions require a building permit, and depending on scope, may also require separate electrical, plumbing, and mechanical permits. Structural additions that connect to the existing load path also require framing inspections before walls can be closed. Legacy Construction manages every permit and inspection for every home addition we build so the regulatory process never creates delays on your project.
How long does a home addition take with Legacy Construction?
Most home additions with Legacy Construction run twelve to twenty weeks from groundbreaking to final walkthrough. Larger additions with second stories, complex roofline integrations, or full mechanical systems can take longer. The reason additions take longer than homeowners expect is the inspection sequence — foundation, framing, rough-in, and insulation inspections all have to happen in order before the next phase begins. Legacy Construction builds that sequence into the schedule from day one and provides weekly updates throughout.
How much does a home addition cost in Southern Maine?
A single-room addition in Southern Maine typically runs $80,000 to $150,000 depending on size, finish level, and structural scope. Larger additions with full mechanical systems, second stories, or complex roofline integrations can reach $200,000 or more. The biggest cost variables are foundation conditions, structural engineering requirements, mechanical scope, and the extent of material matching required to your existing home. Legacy Construction provides a fixed-price contract before breaking ground and backs every addition with our 1-year materials, 2-year systems, 5-year workmanship, and 10-year structural warranty package.
Can you build an addition while we are still living in the home?
Yes. Most of Legacy Construction's home additions are built on occupied homes. We sequence construction to maintain access to your living spaces and minimize disruption throughout the project. Before breaking ground, we discuss which areas will be affected and when, so you can plan accordingly. Jonathan Henshaw coordinates all trade scheduling to keep the build moving without unnecessary disruption to your daily life. Clear weekly communication throughout keeps you informed of every phase and what comes next.
What warranty covers a home addition built by Legacy Construction?
Every home addition Legacy Construction builds is backed by our full warranty package: 1 year on materials, 2 years on systems, 5 years on workmanship, and 10 years on structural coverage. The five-year workmanship warranty is five times longer than Maine's standard requirement — because we build additions that are indistinguishable from the original structure and meant to perform for decades. Everything is documented in writing before any addition project begins. If something we built is not right, we come back and fix it.
What should we expect during a home addition with Legacy Construction?
When Legacy Construction builds your addition, you receive weekly progress updates, immediate communication when conditions change or discoveries are made behind walls, and a team that manages every trade so you are not coordinating subcontractors yourself. Joe Hausler is on site multiple times per week. Jonathan Henshaw sequences trades to keep the build moving. Tim Schofield delivers the finish work that makes an addition indistinguishable from the original structure. The fixed-price contract signed before breaking ground holds through the entire project.
