Home additions thatintegrate seamlessly.

We design and build room additions, sunrooms, garages and full-scale expansions with structural precision and clean finishes, without compromising the integrity of your existing home.

100% SatisfactionExpert Contractor That You Can Trust

Schwanz Construction

  • 300+Completed projects
  • 500,000+Sq ft constructed and renovated
  • 5+Years of experience
  • 100%Client satisfaction

Types of additions

More space. More comfort. More value for your home.

Whether you’re adding a new bedroom, expanding your kitchen, building an extra bathroom or constructing a garage, our team delivers home additions with a strong focus on safety, aesthetics and functionality.

Every addition is planned to integrate with the existing structure, preserving visual harmony, structural stability and energy efficiency.

Full home addition

A large-scale expansion that adds significant square footage to the existing footprint.

  • New primary suite
  • Expanded living areas
  • Multi-room extensions

Second-story addition

An entirely new level above the existing home, commonly used on ranch-style homes to double square footage without expanding the footprint.

Garage addition

An attached or detached garage, customized to your property and needs.

In-law suite or ADU

A self-contained living unit added to the property: attached, detached or built above a garage.

  • Bedroom and bathroom
  • Kitchenette
  • Private entrance

Bump-out addition

A small extension of an existing room, ideal for increasing space without a full addition.

Deck addition

Exterior platforms with railings and stairs.

  • Wood
  • Composite
  • PVC

Recent projects

Built with care, precision and your future in mind.

See all projects
Additions project by Schwanz Construction
Additions project by Schwanz Construction
Additions project by Schwanz Construction

How we build additions

Planned with precision. Zero structural compromise.

Every addition is integrated into the original home through detailed structural analysis, full system coordination and controlled execution, protecting the existing structure.

  1. 01

    Structural evaluation and diagnostics

  2. 02

    Detailed design to eliminate conflicts

  3. 03

    Accurate and transparent budgeting

  4. 04

    Clean, controlled construction

  5. 05

    Seamless aesthetic integration

  6. 06

    Final inspection and project delivery

Client reviews

Proven results, in our clients’ words.

  • Google review

    I hired Schwanz to build two sets of stairs for my house. They did a fantastic job and were great with communication. Very professional. I would hire them again!

    Ian Theriault
  • Google review

    I am a general contractor based out of central NH. I was contacted a couple of months ago in regard to potential “partnering” on some upcoming projects I have/had on schedule. After a few weeks of pondering this I decided to give this relationship a GO! From the onset the wonderful management team from Schwanz Construction was communicative, resourceful and professional. I had a project located in Maine I needed to process before the winter. As most of us professional contractors are aware subcontracting work out is the norm. I contacted Pedro and his team and discussed the project in detail, we met and put this project on direct schedule. From the moment his team arrived I breathed a breath of fresh air. Impressive is a clear understatement. I placed my project manager in direct contact with Pedro’s and off to the races they went. Of course with every project arises some obstacles and some unforeseen challenges and the couple that did present themselves were met eagerly with resolve. In business we look for several things in a company. Like my own operation, service, communication, moral and ethic stand out and the crews incorporated within this company SCHWANZ has it all. There is not one fraction of a doubt I will utilise this great resource again and again. Professionalism has a fresh new look and cavalier spirit and approach is predominant with this great company. What a bright future this company has. Respectfully and honourably I submitted! Encore metal roofing and construction

    Paul Morrow
  • Google review

    Schwanz did a great job repairing & painting my home. They are extremely organized and their communication was excellent throughout our project. I recently recommended them to a friend who is now also scheduled Schwanz to paint their home!

    Neil Hause
  • Google review

    Great job, kind service

    Viena Posada
  • Google review

    Schwanz Construction was very responsive and worked very quickly. They provided pictures of their work and were responsive to questions and requests throughout. They were also very affordable. We will use their services in the future, and appreciate the hard work!

    Amoria Brown
  • Google review

    I used Schwanz Construction for a project a few weeks ago. Called to get a quote, they were able to show up two days later. Promised me the quote in three days, but gave it to me the next day. They were able to start the actual work a week later. Work was perfect. Even had a crew come in a few days after to verify my satisfaction. They are reasonably priced, started the work quickly and didn’t disrupt my house. Would use them again and recommend them to everyone.

    Vince Pierri
  • Google review

    This company came to our home, scraped and painted all of our exterior woodwork. They did a fantastic job. We did a walk around and found a few spots that needed to be touched up. Without hesitation they set some guys by to do the touch ups and it looks fabulous. Great company to work with, and we will use them for future projects.

    Dawn Hodges
4.7Average Google rating from 37 reviews, as of October 2026.Read all reviews on Google
New Hampshire Home Builders Association TrexPro Fully insured 4.7 on Google

Ready to expand your home with confidence and precision?

Reach out today and let’s bring your vision to life with quality, clarity and confidence.

  • 300+Completed projects
  • 500,000+Sq ft constructed and renovated
  • 5+Years of experience
  • 100%Client satisfaction

FAQ

You have questions, we have answers.

Not covered here? Call +1 603-556-2431.

Is it safe to add onto my existing home?

Yes. Before moving forward, our team works with licensed engineers to assess your home’s structure and ensure the addition can be safely and properly integrated.

Will construction disrupt our daily routine?

Some disruption is expected, but we take careful steps to minimize impact. We communicate clearly, maintain a clean job site and plan work phases to reduce inconvenience as much as possible.

How long does a typical home addition take?

Timelines vary depending on the size, complexity and scope of the addition, as well as permitting and inspections. Once we evaluate your project, we provide a realistic and detailed schedule.

Can we live in the home during construction?

In most cases, yes. We plan the work so homeowners can remain in the house whenever it’s safe and feasible to do so.

Do you handle permits and inspections?

Yes. We take care of all required permits and coordinate inspections with local authorities to ensure everything meets code.

How do you ensure the addition matches the existing home?

We match architectural style, materials, finishes and structural details so the addition blends seamlessly with your existing home.

Schwanz Construction crew member working on an exterior wall

Let’s start your project

Tell us what you want to build.

Request a consultation

Share a few details. We will get back to you to set up an initial consultation.