Basement Remodeling
in Great Seattle Area
(425) - 217 - 3639
Double the square footage of your home
Get 3 layout options priced to fit your budget
Our expert will be at your home within 24 hour
Design + Permits + Construction — All in One
No juggling contractors. We handle it all.
53+ Finished Basements in Greater Seattle
Proven results you can trust.
What Our Clients Say
Average rating ★ 5.0 from 48 verified reviews.
We design, permit, and build your basement from start to finish — turning unused space into something extraordinary.
With 53+ projects completed in your neighbourhood, we know how to deliver.
Home Office
Private Rental Unit (with separate entrance)
Sauna
Guest Floor for Family
Full ADU Units /Airbnb‑Ready Unit
Spacious Kids’ Playroom
Up to 40 Years’ Residential Experience — All the Experts You Need, In‑House
A poorly done basement remodel can lead to structural issues, moisture problems, and costly repairs. That’s why our team handles every step — design, permits, pre‑construction planning, and expert building — all under one roof.
Design
We create multiple layout options, choose the best solution with you, and order all materials in advance.
Our architect and structural engineer work together to ensure your project meets all codes and requirements — and we handle all city inspector communications and approvals.
Permits
Pre‑Construction Planning
We build the project schedule around your lifestyle to minimize disruption.
Construction
Our construction experts and project managers keep you updated 24/7, with an online project schedule. We parallel work processes to save you time.
Warranty
We perform follow‑up walkthroughs at 1 month and 1 year. You get a 1‑year workmanship warranty plus $2M liability coverage.
What Can We Do to Transform Your Basement?
With 50+ possible upgrade options, we tailor every project to your goals and your home’s unique structure — while keeping up with the latest design trends and smart solutions.
You can share your vision with us, or trust our experts to recommend the plan that works best for your space.
Raise ceilings by lowering the floor
Enlarge or add windows for more light and code compliance
Build new walls to create bedrooms, offices, or living areas
Install full plumbing and electrical for kitchen, bathroom, and laundry
Add a separate entrance for privacy or rental income
Connect basement to garage space for expansion
Insulate and finish with mold‑resistant materials
Schedule Your Free In‑Home Basement Remodeling Consultation
Get a professional on‑site assessment within 24 hours --- absolutely free.
Trusted & Guaranteed – Top‑Rated, 48+ five‑star reviews, $2M insurance coverage, and a 1‑year workmanship warranty.
Why Work with AG Construction & Remodeling?
Proven Expertise – Since 2009, 53+ custom projects and 100,579 sq ft remodeled in King County, with specialists holding 40+ years of experience.
All‑In‑House Team – Architecture, structural engineering, and permit administration handled under one roof for a smooth, stress‑free process.
Ilia
Owner AG Construction & Remodeling
“Since 2009, our approach has been to treat every basement remodel as an investment in your home’s value and livability — not just a cosmetic upgrade. From lowering floors and adding separate entrances to waterproofing and building full ADU units, we handle every stage with precision, including all permits, inspections, and city coordination, so you can enjoy the results stress‑free.”
Our Resources Deliver
High‑End Remodeling Service
Licensed Professionals – Architects, engineers, electricians, plumbers, and other certified experts.
Proven Experience – From 1920s home restorations to 3,000+ sq ft remodels and major storm repairs
Skilled, Synchronized Crews – Multiple teams for each trade, working efficiently and on schedule.
We finalize design and architectural plans before construction, so you know the full cost upfront.
Transparent Estimates — No Surprises
Included:
1‑month & 1‑year service check‑ins
Costs may vary only
10–15% during work
Expert analysis, multiple layouts & 3D visuals
Returning clients get a
labor discount
Construction‑only
option available
Architectural plans & structural engineer review
Permits & coordination with the city
Materials, demolition, construction & landscaping
1‑year warranty & $2M insurance
Schedule Your Free In‑Home Basement Remodeling Consultation
Get a professional on‑site assessment within 24 hours — absolutely free.
AG Construction and Remodeling is a premier home renovation company based in Bellevue, Washington. We specialize in transforming homes into beautiful, functional spaces. With a commitment to quality craftsmanship and exceptional customer service, we offer a wide range of services, including basement remodeling, kitchen and bath renovations, garage conversions, and new home construction.
Our experienced team handles every aspect of the project, from initial design and permitting to final touches, ensuring a seamless and stress-free experience for our clients. At AG Construction and Remodeling, we are dedicated to making your home renovation dreams a reality.
ABOUT AG CONSTRUCTION AND REMODELING
Our Locations
PROUD TO SERVE THE AREAS WHERE WE LIVE AND WORK
We are serving Bellevue, Kirkland, Seattle, Redmond, Renton, Bothell, and all of King County with premium-level basement remodeling, new home construction, kitchen and bath remodeling, garage conversion, and more.