Skip to content
menu
close

Custom ADUs & In-Law Suites for Rockingham County & Southern Maine Homes

Beautiful, complete living spaces for New Hampshire and Southern Maine homes

Sunny room in the attic in romantic style

Your Trusted ADU & In-Law Suite Design-Build Experts

Adding an ADU or in-law suite is one of the most impactful ways to create space, flexibility, and long-term comfort in your home. If you’re planning for aging parents, welcoming adult children, or simply expanding your property’s potential, Oxland Builders is your Seacoast New Hampshire and Southern Maine design-build contractor for ADUs and in-law suites.

Our in-house design and project management teams guide you from concept to completion, ensuring your new space is seamlessly integrated, thoughtfully designed, and built to last.

Popular upgrades for ADUs and in-law suites

select_check_boxEnergy-efficient design
select_check_boxHeated bathroom floors
select_check_boxAging-in-place features
select_check_boxCompact full kitchen
select_check_boxCustom storage solutions
select_check_boxUpgraded soundproofing

Our Design-Build Process for ADUs

Our fully insured team of professional drafters and custom home carpenters offers a unique building experience for homeowners in Seacoast New Hampshire and Southern Maine. We complete the entire design-build process in-house, making ADU and in-law suite construction more coordinated, affordable, and efficient.

1 | Collaborative Design
We start with a conversation to understand your vision, lifestyle, and goals. Then, our in-house designers create and iterate detailed plans and 3D renderings, ensuring every element reflects your style and needs.
2 | Thorough Planning
With a solid design in place, we map out every detail, from budget and materials to scheduling and permits. Our organized approach ensures a smooth transition from concept to construction.
3 | Thoughtful Execution
Our vetted craftsmen and project managers bring your vision to life with precision and care. We keep you informed every step of the way, ensuring the final result is exactly what you envisioned.

Accessory Dwelling Suite/In-Law Suite FAQs

What is an ADU or in-law suite?expand_more

An ADU (Accessory Dwelling Unit) is a secondary, self-contained living space on your property, often with its own entrance, kitchen, bathroom, and living area. Oxland designs both attached and detached options, helping you choose the right layout for privacy, accessibility, zoning requirements, and long-term needs.

How much does an ADU cost near New Hampshire?expand_more

Costs vary widely depending on size, site conditions, utilities, finishes, and whether the unit is attached, detached, or built above a garage. Most clients can expect an investment similar to a full home addition in our New Hampshire and Southern Maine service area.

During Oxland’s Scope Development phase, we outline every detail, such as materials, budget, and timelines. This way, you know exactly what you'll spend before construction begins.

See our remodeling cost guide for New Hampshire and Southern Maine if you would like more detailed local information. 

Do I need permits to build an ADU or in-law suite?expand_more

Yes. Most municipalities on the Seacoast require building, zoning, and sometimes special-use permits. ADU regulations can vary by town, including size limits, parking requirements, and whether rental units are allowed.

Our team manages the permitting process for you, ensuring your project meets all local requirements.

Can an ADU be attached or detached from my home?expand_more

Yes. ADUs can take many forms. Oxland Builders offers:

  • Attached additions

  • Detached backyard cottages

  • Garage or above-garage units

  • Basement or attic conversions (where egress and structural requirements allow)

What Universal Design Features Should I Include in an ADU?expand_more

Universal design focuses on creating spaces that are safe, comfortable, and accessible for people of all ages and abilities, making it ideal for ADUs and in-law suites. These features enhance usability for guests, long-term living, and future resale value. We help you consider elements like zero-step entries, wider doorways, curbless showers, accessible layouts, and thoughtful lighting.

Oxland-Remodeling-Cost-Guide

Plan with Confidence: Your Remodeling Cost Guide for New Hampshire and Southern Maine

Remodeling is a big investment. This guide shows what is possible at different budget levels, with real pricing, visuals, and Oxland expertise for homeowners in New Hampshire and Southern Maine.

Get Access Now double_arrow

Explore Our ADU Portfolio

Paulin Garage

Coastal New Hampshire bedroom featuring a platform bed, white bedding, natural light, and vibrant green indoor plant in the foreground

Kitchen and living room with induction stove in home remodel

Where We Work

Oxland Builders proudly serves homeowners throughout Rockingham County in New Hampshire and nearby communities in Southern Maine. Our team specializes in custom home building, high-end renovations, ADUs, and expertly designed additions for clients along the Seacoast. Whether you're updating your current home or building from the ground up, we bring creativity, craftsmanship, and a proven design-build process to every project.

We are deeply familiar with the unique architectural styles and permitting requirements across the region, making us a trusted choice for projects in both established neighborhoods and rural properties. If you're located outside our primary service area, reach out to us. We’re happy to explore whether your location is a good fit for our team.

Our Service Area

New Hampshire

  • Stratham

  • Exeter

  • Portsmouth

  • Hampton

  • North Hampton

  • Rye

  • Greenland

  • New Castle

  • Newmarket

  • Durham

  • Seabrook

  • Epping

Southern Maine

  • Kittery

  • Eliot

  • South Berwick

  • York

  • Ogunquit

  • Wells

Oxland Builders is rated 4.5★ on Google. Read our reviews!
Spacious bedroom with wooden flooring and a cozy bed, a project by Oxland Builders in New Hampshire

What Our Clients Think

"We recently had to move our in-laws in with us and needed to build them a room. We met with Brad and he was able to quickly assemble a team to create a space that was suitable for them. I can’t thank Brad, Claudia and the whole Oxland Builders team for finishing this project in record time. They are thorough, punctual and super organized, and thanks to the Buildertred app, I knew when people would be working and when all invoices were due. I know I’ll be calling them again for a future project."

Jason Landry

Rustic-style bathroom with wood-paneled accents and a glass-enclosed shower, designed by Oxland Builders in New Hampshire

What Our Clients Think

"They really listen to us and we never wonder what's going on because we've been part of the process every step of the way. Thank you!"

Kirsten Larsen Schultz

Modern farmhouse style bedroom by Oxland Builders

What Our Clients Think

"Oxland was great to work with. Very professional and did an outstanding job. They were very easy to work with and the communication was great so we always knew where we were on our project. I would highly recommend working with Oxland."

Patrick O'Connor

Contemporary Seacoast, NH bathroom featuring light wood vanity, dual mirrors, modern lighting, and a glass-enclosed shower with seafoam green tile

What Our Clients Think

"Still loving the renovation Oxland Builders did on our 1750 farmhouse. Great work that is built to last."

Tim Barton

Coastal New Hampshire bedroom reflected in a round mirror above a dresser with potted plants and bright yellow accents

What Our Clients Think

"Brad and his team know their stuff. Having seen the before and afters of Oxland Builder's work I couldn't recommend them enough."

Kyle Battis

Talk to Us About Your ADU or In-Law Suite Project

Tell us about your home, project goals, and what you’re hoping to create. We’ll review your details and follow up to schedule a conversation.