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Expand Your Home

Home Additions

Expanding your home is a major investment, but the right addition can dramatically improve both your living space and your property value. Whether you need extra room for a growing family, a dedicated home office, or a relaxing sunroom, 603 Contracting provides high-quality additions that integrate seamlessly with your existing home.

Why Choose 603 Contracting?

Custom Design Options

Whether you have architectural plans or need help developing a concept, we work with you to design an addition that fits your needs.

Clear Communication & Budgeting

We help homeowners stay on budget by clearly defining scope changes and updating costs during the project.

Minimal Disruption

We take measures to protect your home, using floor protection, dust barriers, and clear work schedules.

Proven Quality & Professional Team

Our experienced crew delivers top-tier craftsmanship, ensuring your addition is built to last.
Ready to start planning your home addition? Schedule a consultation today.

Types of Additions

Every home addition is unique, but here are some of the most common projects we build:
Garages

Garage with Living Space

Expand storage or create an extra room above your garage.

In-Law Suite / ADU

Build a comfortable, private space for family members.
Covered deck

Four-Season Room / Sunroom

Enjoy natural light year-round with a climate-controlled extension.
Mudroom area

Mudrooms & Entryways

Keep your home organized with a dedicated space for coats and shoes.
Dormer

Dormers & Second-Story Additions

Increase headroom and add space without extending your home’s footprint.
Shed

Sheds & Workshops

Custom-built outdoor spaces for storage, hobbies, or work.
Carport

Carports & Covered Parking

Protect your vehicles from the elements with a durable addition.

Decks & Screened Porches

Create an inviting outdoor living area with added comfort.
Not sure what type of addition is right for your home? Contact us to discuss your ideas.
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Our Work in Action

Project Examples

We’ve completed home additions across Southern New Hampshire, helping homeowners transform their spaces. Take a look at some of our past projects:
pool deck before

Before

pool deck after

After

Yellow house before

Before

Yellow house after

After

Frequently Asked Questions

How do I start planning a home addition?
The first step is defining your goals and budget. We provide an on-site evaluation to assess feasibility and determine the best approach.
Do I need an architect for an addition?
Not always. If you already have an architect, we’re happy to collaborate. If not, we can create basic design plans in-house and guide you on when architectural drawings are required.
Do I need a permit for my addition?
Yes, most home additions require permits. We handle all necessary permits and inspections to ensure your project meets local building codes.
Can I live in my home during construction?
Yes, in most cases. We minimize disruption with clear work schedules, dust protection, and daily cleanup. For major projects, we’ll discuss any temporary relocation needs.
How long does an addition take to complete?
Timelines vary based on size and complexity, but most additions take between 4-12 weeks. We provide a detailed timeline before work begins.
What budget factors should I consider?
In addition to construction costs, consider design fees, permits, and material choices. We provide clear allowances and help you stay within budget.
What happens if I want to make changes during construction?
We understand that needs evolve. Any scope changes will be clearly defined, and updated costs will be reviewed with you before proceeding.

Get Started Today

If you're thinking about expanding your home, 603 Contracting can help make it happen. From design to final build, we ensure a seamless process and a high-quality result. Request a consultation to discuss your home addition project today.
REQUEST A CONSULTATION