Skagit · Whatcom · Snohomish

(206) 719-4508

TDC Clean & DryTDC Construction
Room under construction with new wood stud framing, a plywood subfloor, textured drywall and tools laid out

Home Additions · Stanwood, WA

Home Additions in Stanwood, WA — By TDC Clean & Dry

TDC Clean & Dry builds home additions for homeowners in Stanwood and across Snohomish, Skagit and Whatcom counties. We plan the space, handle permits and build the addition so it looks like it was always part of the house. Just as important, we tie it into the existing roof and walls so the joint between old and new stays dry.

What's included

What Our Home Addition Service Includes

An addition is a small house built onto a big one. Every system has to connect cleanly to what is already there.

  • A site visit to check the lot, the existing structure and what zoning allows
  • Plans, engineering where needed, and building permits
  • Foundation, framing and a roof that ties into the existing house
  • Flashing, weather barrier and insulation carried through the joint between old and new
  • Electrical, plumbing, heating, drywall and finishes matched to the rest of the home

Local expertise

Adding Space to a Stanwood Home

For many Stanwood families, building on makes more sense than moving.

About two thirds of Stanwood's homes are single-family houses, and roughly 62 percent are owner-occupied, according to U.S. Census data. The median home value is about $593,000. With prices at that level, adding a bedroom, a family room or a primary suite is often a better value than selling and buying bigger.

What you can build depends on the lot. City and county zoning rules limit how close an addition can sit to property lines and how much of the lot buildings can cover. Inside city limits, permits go through the City of Stanwood. Outside them, Snohomish County handles review. On a septic system, adding a bedroom can also trigger a review of the system's capacity. We check these limits before design starts, so you do not pay for plans you cannot build.

The joint between the new addition and the old house is where problems usually start. Poor flashing at the roof or wall tie-in lets rain in, and in a wet climate that water does damage for years. We repair that kind of damage for a living. So we detail those tie-ins with care and carry the weather barrier, insulation and crawl space vapor barrier through the transition.

Our process

How We Build Home Additions

Five stages from the first conversation to moving into the new space.

  1. Visit and check feasibility

    We look at the house, the lot and the space you want to add. We check setbacks, lot coverage and the existing structure. You find out early what is realistic and what it will take.

  2. Design, plans and permits

    The addition is designed to fit your needs and match the house. Plans and any engineering are prepared, then submitted for permits. You get a written scope, estimate and schedule before construction starts.

  3. Foundation and framing

    Footings and a foundation go in, followed by floor, wall and roof framing. Inspections happen at each required stage. The house stays closed off from the work area as long as possible.

  4. Tie in, dry in and rough in

    We open the connection to the existing house and tie the roof and walls together. Flashing, roofing, windows and weather barrier make the addition weathertight. Wiring, plumbing and heating are then run and inspected.

  5. Insulate, finish and walk through

    Insulation, drywall, flooring, paint and trim finish the space to match the rest of the home. Final inspections close out the permit. We walk through the finished addition with you before the job is complete.

Addition types

Home Additions We Build

The right addition depends on the space you need and how much room the lot allows.

Bump-outs

A bump-out extends one room by a few feet, often a kitchen, bathroom or dining area. It is the smallest type of addition. It can add a lot of usable space without a full new room.

Bedroom and family room additions

A new bedroom or family room gives a growing household breathing space. We place it to connect naturally with existing hallways and living areas. Heating, lighting and outlets are planned from the start.

Primary suite additions

A primary suite adds a bedroom, a bathroom and often a closet in one project. The bathroom brings plumbing and waterproofing into the addition. Our remodeling crew builds those bathrooms to stay dry.

Kitchen and living area expansions

Pushing out an exterior wall can turn a cramped kitchen into an open, working space. We pair the addition with the kitchen remodel so both are designed together.

Home additions FAQ

Home Addition Questions, Answered

Common questions about home additions in Stanwood, WA.

Do I need a permit for a home addition in Stanwood?

Yes. Home additions need building permits. Inside city limits, they go through the City of Stanwood, and outside them through Snohomish County. We prepare and submit the permit application as part of the project.

How long does a home addition take?

Design and permitting often take several weeks or more before construction starts. Construction itself commonly runs a few months, depending on size and complexity. Your estimate includes a realistic schedule for both.

Can the addition match my existing house?

That is the goal. We match rooflines, siding, windows and trim as closely as the materials allow. Inside, flooring, paint and trim are chosen to flow from the existing rooms.

Can we live in the house during construction?

Usually, yes. Most of the work happens outside the existing house until the tie-in. When we open the connection, we seal off the work area to control dust and weather.

Will a bedroom addition affect my septic system?

It can. Adding a bedroom may require a review of your septic system's capacity before a permit is issued. We check this early, because an upgrade can change the budget.

Is it better to add on or move?

It depends on your lot, your budget and how much space you need. Adding on avoids selling costs and keeps you in a neighborhood you like. We can give you a clear estimate to compare against moving.

More space, built to last.

We handle the addition from feasibility and permits to the final walkthrough, with one point of contact throughout. Flexible financing is offered through Enhancify, and 0% interest options may be available.

Planning a bigger project? We also handle ADU construction, flooring installation and kitchen remodeling for Stanwood homes.

Reviews

What local homeowners say.

Real reviews from real clients on our Google Business Profile — unedited.

Paula KMay 2026Google review

My house flooded one day before I was scheduled to sign it over to its new owners. I was already living 3,000 miles away. The house was drying for 3 weeks before I got in touch with Scott. It was only a few weeks before Christmas and my buyers were ready to walk away from the deal. Every room of the house except for the kitchen and one bathroom was damaged. Scott and his team came in a saved the day. They were able to completely fix everything to the liking of my picky buyers within a few weeks! I am so grateful to TDC and the hard work they did up until a few days before Christmas. The only thing I wish I did differently was find them sooner so they could have done the dry out portion. I know that they could have done it more efficiently than the large chain that I hired. These people are hard working and trustworthy and I would absolutely recommend them.

Service: Water damage restoration

Sonja ForemanMay 2026Google review

We bought our first family home and TDC did our remodel. We couldn’t be more happy with the job they did. Scott’s entire team was so easy to work with and the results speak for themselves! We would highly recommend TDC to anyone that wants quality custom work done on their home.

Service: Home remodel

Aaron FergusonApril 2026Google review

Scott at TDC was great to work with. We had a major water leak, requiring total gutting and rebuild of 2 apartments. He and his team worked well with insurance, kept in touch with progress, answered questions, and completed the work with high quantity. He demonstrated that he cares about his clients and not simply there for a quick buck. Having had previously horrible experience with “contractors” or handymen, TDC was great to work with and we will continue to do so.

Service: Water leak rebuild

John SutherlandApril 2026Google review

TDC Clean and dry came in and took care of our bathroom and kitchen water mitigation issues and helped us get back to normal in no time. They were professional and understanding and helped us get though a very stressful situation.

Service: Water mitigation

Timothy AlgerMay 2026Google review

TDC did a great job on our master bathroom floor. I was under the impression that they were going to replace a small area of the floor where the water was. Instead, they replaced the whole bathroom laminate flooring. Great job!

Service: Bathroom flooring

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