Custom ADUs for Family, Guests, or Rental Income
As a trusted Eastside ADU builder, we help homeowners in Kirkland, Bellevue, and across the Eastside add a custom accessory dwelling unit — for aging parents, a private guest space, a home office, or extra rental income — using Washington’s new ADU laws.
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One Backyard, A Lot of Possibilities
An ADU is one of the most flexible things you can add to your home. For homeowners in Kenmore, Kirkland, and across the Eastside, it can be a place for aging parents or adult kids, a private guest suite, a quiet home office, or a rental that helps cover your mortgage. We help you make the most of the space you already own.
Room for Family
Keep loved ones close with their own private space. ADUs are perfect for aging parents, adult children, or multigenerational living — independence and togetherness under one roof.
Rental Income That Helps
Whether you rent long-term or host short-term guests, a well-built ADU can bring in meaningful monthly income to help offset your mortgage or add to your savings.
Built Under New WA Laws
Washington's updated ADU laws now allow up to two units on many single-family lots. We know the rules inside and out and help you take full advantage of what's now possible.
Flexible, Year-Round Space
A home office, a guest house, a studio, a place for a returning college kid — your needs change over time, and an ADU gives you space that can change with them.
Your One-Stop Shop ADU Builder
From the first site visit to the final walkthrough, we handle every part of your ADU — design, permitting, and construction — under one roof. One team, one point of contact, and a finished space built to fit your property and your needs.
Detached ADUs (DADUs)
Often called backyard cottages, DADUs are standalone units that offer the most privacy — ideal for family, guests, or a rental. We design and build custom cottages that complement your main home while making the most of your lot and layout.
Attached ADUs
A cost-effective option created by converting existing space like a garage or basement, or adding on to your home. Perfect for tighter lots, and a great way to add a living space, in-law suite, or rental without building from scratch.
Two-ADU Development
Thanks to new Washington laws, many Eastside lots now qualify for two ADUs. We’re one of the few local builders experienced in planning and building both — whether you want space for extended family, a guest cottage plus a rental, or room to grow into later.
Feasibility, Design & Permitting
The planning phase matters most. We handle site assessments, navigate the zoning rules in cities like Woodinville and Bothell, design a unit that fits how you’ll actually use it, and manage the entire permitting process for you.
A Smooth Path from Concept to Completion
We’ve refined our process to be clear, organized, and easy to follow. ADUs come with extra moving parts — zoning, permits, utilities — so we handle the complexity and keep you informed at every step, from first conversation to finished unit.
Free Consultation & Feasibility
We start by understanding what you want your ADU to do — house family, generate income, or both. Then we assess your property, review local Eastside rules, and give you a clear picture of costs, timeline, and what's possible on your lot.
Design & Planning
We create a custom layout built around how you'll actually use the space, and handle all the architectural and engineering plans. Every choice is made to fit your budget and your goals before construction begins.
Permitting & Pre-Construction
We take the lead on submitting documents and working with local planning departments to secure your permits. This is also when we finalize material selections and build a detailed schedule for a smooth start.
Skilled, Clean Construction
Our experienced crew gets to work, and you'll have a dedicated point of contact giving you regular updates. We keep the job site clean, organized, and as low-impact as possible on your daily life.
Final Walkthrough & Asset Handover
Before we finish, we walk the completed ADU with you to make sure every detail is right — then hand over the keys to your brand-new space, ready to move in, host, or rent.
ADU Development FAQs
We want you to feel informed before you build. Here are answers to some of the most common questions homeowners ask about adding an ADU on the Eastside.
How much does building an ADU cost in the East-Side area?
ADU costs vary based on size, site conditions, and finishes. A detached ADU typically starts around $250,000–$300,000 and goes up from there. During our feasibility phase, we give you a detailed, line-item budget so you know exactly what to expect — no surprises.
Can you really build two ADUs on my property?
Yes. Thanks to new Washington laws, many single-family lots now qualify for two ADUs — for example, one attached and one detached. We’ll do a feasibility study to confirm what’s possible on your specific property in Kirkland, Bothell, or wherever you are on the Eastside..
How long does the full ADU construction process take?
It depends on the project and your city’s permitting timeline. As a general guide, design and permitting take about 4–6 months, with construction adding another 5–8 months. We’ll give you a project-specific timeline up front and keep you posted throughout.
Do you handle all the permits and city inspections?
Absolutely. We’re a one-stop shop for ADUs — we manage the entire permitting process from initial application through coordinating every required city inspection, so you never have to deal with the city yourself.
What is the potential rental income for an ADU on the Eastside?
It depends on the unit’s size, location, and finishes, but well-designed Eastside ADUs commonly rent for $2,500–$4,000+ per month. For a lot of homeowners, that income goes a long way toward offsetting the monthly mortgage.
Ready to Add Space to Your Home?
Whether it’s room for family, a private guest space, or a rental that helps with the mortgage, we’ll help you build an ADU that fits your property and your life. Contact Pelletier Construction for a free consultation and a clear, honest look at what’s possible on your lot.