ADU Design & Build

Expand your living space with an ADU.

Smart Custom Design

Every ADU starts with a custom design shaped around your goals, site conditions, and budget. We use precise site measurements and 3D modeling to create accurate, code-compliant plans that streamline estimating, permitting, and construction.

Seamless Permitting

Our team manages the full permitting process with Bellingham and Whatcom County, ensuring your ADU meets local zoning and building requirements from the start. This reduces delays and keeps the project moving smoothly.

remodeling, adu construction, and landscape design and construction

Quality Construction

Your ADU is built by a dedicated construction team known for craftsmanship, clear communication, and attention to detail. We focus on durable materials, clean execution, and delivering a finished space that matches the design you approved.

Real Experiences from Real Projects

Hear from our recent clients.

Recent ADU Designs

ADUs we've designed and built here in Whatcom County
Cottonwood Cottage

2 Bed

2 Bath

784 Sqft

Alder Grove House

2 Bed

2 Bath

1,100 Sqft

Stonybrook Cabin

1 Bed

1 Bath

555 Sqft

Have a different style in mind?

We can design any custom ADU, from compact rental studios to larger multi-room layouts. Every PCL plan is fully customizable and built around your vision.

ADU Specialist Certified

Our team has completed the Earth Advantage ADU Specialist certification, a program focused on Washington ADU zoning, permitting, and design best practices. This training helps us stay current on evolving ADU regulations and deliver smarter, code compliant designs from the start.

Why choose PCL for ADU Design & Build?

What's included with our ADU Design & Build service?

Our ADU (Accessory Dwelling Unit) design services offer a comprehensive approach to creating a functional and aesthetically pleasing additional living space. Here’s what’s included:

Feasibility & Site Evaluation
We start by confirming zoning, setbacks, access, and utility constraints. This ensures your ADU concept is viable before design begins.

Custom ADU Design
Every ADU is designed specifically for your property, goals, and budget. Our team creates detailed plans and 3D visuals that account for code requirements, livability, and long term value.

Permitting & Code Compliance
We manage the full ADU permitting process, including zoning review, plan submittals, and required revisions to help reduce delays.

Accurate Budgeting & Pre Construction Planning
Since we handle both ADU design and construction, pricing is informed by real build costs. This leads to clearer budgets and fewer changes during construction.

Full Service ADU Construction
Our construction team executes the approved plans with a focus on craftsmanship, communication, and durability, delivering a finished ADU that matches the design you approved.

ADU Education & Guidance
Clients benefit from our in depth understanding of local ADU regulations, costs, and timelines. For a deeper breakdown of zoning rules, costs, and planning considerations, explore our Complete ADU Guide for Bellingham and Whatcom County.

Frequently Asked Questions

More Questions? Contact Us!
What is an ADU and Why Should I Consider Building One?
An Accessory Dwelling Unit (ADU) is a secondary housing unit on the same property as a main residence. ADUs are a great option for expanding living space, housing family members, or generating rental income, all while potentially increasing your property’s value.
The timeframe for designing and constructing an ADU can vary depending on several factors, including the complexity of the design, the permitting process, and construction details. Generally, it can take anywhere from a few months to over a year from initial design to completion.
Yes, ADUs in Bellingham must comply with certain zoning laws and building codes, which can include limitations on size, location, and occupancy. We handle the permitting process and ensure that all designs meet local regulations.
Absolutely! We specialize in custom ADU designs tailored to your specific needs and preferences. Whether you want a compact studio or a two-bedroom dwelling, we work with you to create a space that fits your requirements.
Absolutely! We specialize in custom ADU designs tailored to your specific needs and preferences. Whether you want a compact studio or a two-bedroom dwelling, we work with you to create a space that fits your requirements.
Absolutely! We specialize in custom ADU designs tailored to your specific needs and preferences. Whether you want a compact studio or a two-bedroom dwelling, we work with you to create a space that fits your requirements.

Explore Our Other Services

Designing and transforming spaces with purpose, beauty, & value.

Additions and Remodels

ADU Design & Build

Bathroom Remodels

Commercial Landscaping

Concrete

Custom Home Design

Custom Saunas

Custom Sport Courts

Decking

Fencing

Irrigation

Kitchen Remodels

Landscape Design

Outdoor Kitchens

Outdoor Lighting