Expert Home Addition Contractor in Portland, ME

Black checkmark on a white background.

Searching for a Home Addition Contractor in Portland, ME? We can expand your residence with an addition that blends rather than appearing as an obvious afterthought or a disconnected element.

Black checkmark on a white background.

We handle foundations, structural work, and matching your roofline. Our team works carefully to add onto your home without causing big problems during construction.

Black checkmark on a white background, indicating a positive selection.

Adding onto your home gives you more space and increases your home's value. You won't need to move, and we finish on time with quality work.

A contractor smiling, with showcases of Maine nprojects in the background.
Emblem: Celebrating over 250 completed projects since 1997. Maroon and gold.
Black checkmark.

Residential Addition Design and Construction

Black check mark on white background.

Structural Integration and Engineering

Black check mark.

Occupied Home Renovation Management

EXCEPTIONAL HOMES, ENGINEERED FOR GENERATIONS.

Learn what Portland homeowners say about our seamless home additions

Five black stars in a horizontal row, above a white background.

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.

A kitchen with white cabinets, a black stove, and a window with a checkered curtain.
Five black stars.

We spoke with several contractors before choosing Legacy Construction and are glad we did. Their communication was excellent, and they handled every detail of our project with care. They take pride in their work, and it shows in the final product.

It’s hard to find a trustworthy contractor these days, let alone one that cares about the all the details that can easily get lost in the grand scheme of the project. Legacy Construction threaded that needle, and many others, expertly. Looking forward to the next time we can work together.

Bek H.

Interior of a wood-paneled cabin with a wood stove, windows, and unfinished cabinets.
Five black stars.

We appreciated how collaborative Legacy Construction was throughout our project. They listened to our ideas, offered practical solutions, and kept everything on track. The finished work is beautiful and built to last.

Richard A.

Kitchen with large windows, sunlight, grey cabinets, wooden bar stools, and pendant lights.
Gray kitchen cabinets and appliances in a kitchen with beige countertops and tile flooring.
Modern kitchen with blue cabinets, white countertops, and wood floors. Island with seating and hanging pendant lights.

Are you worried about additions that look like awkward attachments to your home?

We know it's worrying when additions don't blend with your home. Legacy Construction builds additions that look like they were always part of your house.


Since 2021, we've been a BBB-certified addition contractor in Portland. We match foundations, rooflines, siding, and windows so everything flows together.


Our work keeps your home looking beautiful while giving you more space.


Need an expert home addition contractor in Portland, Maine? Click the button below to call today.


Why Portland homeowners trust Legacy Construction for seamless home additions

Medal icon with a star in the middle.

Architectural Continuity Expertise


We carefully match your home's siding, trim, windows, roof, and finishes.


Your addition looks like it was always part of your home, which keeps your property looking great and worth more.


A white, stylized check mark icon in a scalloped border.

Occupied Home Construction Management


We know you still need to live in your home while we work.


We use dust barriers, set work hours, and clean up daily so your life stays as normal as possible.


Hammer hitting a nail, sparks flying.

Structural Engineering Coordination


Big additions need expert planning. We work with engineers to safely remove walls, extend foundations, and connect new rooflines.


Everything meets code and blends with your original home.


Hands shaking under a shield with a checkmark, symbolizing agreement and protection.

Comprehensive Warranties


  • 1 year on materials
  • 2 years on systems
  • 5 years on workmanship
  • 10 years on structural coverage
Wooden deck attached to a house with stairs, black railing, and support posts over a gravel area.

Professional Home Addition Services Throughout Southern Maine

Legacy Construction delivers exceptional home addition services throughout Portland and surrounding communities.


Our specialized expertise includes master suite additions, kitchen expansions, family room extensions, second-story additions, and sunroom construction.


We handle complex projects requiring foundation excavation, structural wall removal, roof modifications, and comprehensive interior finishing .


Every addition includes architectural design coordination, structural engineering, material matching, code compliance, and occupied home management protocols.


We execute projects ranging from single-room expansions to complete second-story additions and multi-room extensions. Available 24/7 at 207-544-4607.


Your easy 3-step process to your dream home

1

ARRANGE YOUR ADDITION CONSULTATION APPOINTMENT.

Contact us to discuss your space requirements, budget considerations, and existing home characteristics. We'll evaluate structural feasibility and outline addition possibilities with professional expertise and detailed recommendations.

2

WE'LL CONSTRUCT YOUR SEAMLESS ADDITION.

Our team executes construction with structural precision, architectural matching, and occupied home protocols, ensuring smooth progression with minimal disruption while maintaining superior quality throughout every phase of expansion.

3

ENJOY YOUR EXPANDED HOME IMMEDIATELY.

We deliver your finished addition with architectural harmony, completed on schedule with superior craftsmanship that integrates perfectly with your existing residence, enhancing both function and value substantially.