Construction vs Remodeling vs Renovation: Key Differences

What is the difference between new construction, remodeling and renovation?

The difference is how much of the existing building stays. New construction starts from the ground, or adds rooms the house never had. Remodeling keeps the structure and changes how the rooms are laid out or used. Renovation keeps the layout and replaces worn surfaces, fixtures and finishes.

The words overlap in everyday use. Our pricing guide calls taking a house to the studs a gut renovation, and its Mid-Range level and up include a layout redesign. Our pricing guides name the scope instead: a refresh keeps the layout, a remodel with layout changes moves walls and plumbing, and a gut renovation replaces the systems.

Sources: our kitchen, full home remodel, home addition and ADU pricing guides, updated October 2026, and the SDCI Do You Need a Permit? page, read October 2026.

Is remodeling considered construction?

Yes. Remodeling is construction work on a building that already stands, and Seattle's permit rules cover it. The Seattle Department of Construction and Inspections (SDCI) says: "You need a permit for any work on load-bearing supports, changes to the building envelope, and work that reduces egress, light, ventilation, or fire resistance no matter how small the project." New construction builds new structure. Remodeling and renovation work inside a structure that is already there.

What is the difference between a remodel and a renovation?

A renovation brings a room back to new condition in the same footprint. A remodel changes what the room is or how it works. Repainting, new floors, new counters on the existing cabinets and new light fixtures are renovation. Moving a wall, moving a sink or a toilet, or replacing a tub with a shower is remodeling.

Our kitchen prices show the line. A kitchen refresh keeps the cabinet boxes and the layout, starts at $35,000+ and takes 2 to 5 weeks on site. New cabinets in a small kitchen start at $60,000+. Removing a load-bearing wall needs a beam, engineering and a building permit, so a remodel adds design drawings and inspections that a renovation of the same room often skips.

Do you need a permit to build, remodel or renovate in Seattle?

For most projects, yes. SDCI says on its Do You Need a Permit? page, read in October 2026: "Most projects in Seattle require a permit." Outside environmentally critical areas, it says "You don't need a permit for minor repairs or alterations that cost $6,000 or less in any 6-month period." Painting, installing kitchen cabinets and surface finishes over existing walls are on its list of work that usually needs no permit. Work over that limit that is not on the list can still need a permit. Work on load-bearing supports always does, as quoted above.

A new house, an addition or a DADU always needs a building permit. Every addition does, and a Seattle DADU needs an SDCI building permit plus separate electrical, plumbing and side sewer permits. In Seattle, plumbing and gas permits come from Public Health, Seattle and King County; in Bellevue, permits come from Development Services. Our Kirkland bathroom, where a tub and a shower stall became one walk-in shower, was built under a permit issued April 4, 2023. For the Seattle rules room by room, read Do you need a permit to remodel in Seattle?

How do construction, remodeling and renovation compare on cost and time?

Scope sets the cost. Each step up adds structure, systems or site work. The table lists our published starting prices at the Basic finish level and the typical time on site.

Source: our kitchen, full home remodel, home addition and ADU pricing guides, updated October 2026. Design, engineering and permit fees are priced separately, and design and permits come before the time on site.

Why does new construction cost more than remodeling the same space?

Reusing a structure saves its foundation, walls and roof. Our ADU prices show it: a garage or basement conversion reuses the existing foundation, walls and roof, which is why it starts at $150,000+. A new 300 to 600 sq ft DADU starts at $325,000+.

We publish no price per square foot for a new house, because the lot sets too much of it: demolition, the foundation, and new water, sewer and power connections. We price a rebuild after a site visit. How Much Does It Cost to Build a House in Seattle? sets a rebuild beside each renovation option, and How Much Does a Full Home Remodel Cost? lists every whole house tier.

Is remodeling easier than new construction?

Remodeling is easier on paperwork and site work, and harder on surprises. A remodel usually skips the lot, the foundation and new utility connections. A new DADU, for example, can add city plan review and utility connection fees, the King County sewer capacity charge, a new electrical service, a water meter or side sewer, and tree or geotech reports. Its design and permits usually take 4 to 9 months before construction starts.

An existing house can hide problems that only show once the walls are open. Galvanized pipe, knob and tube wiring and small electrical panels often need replacing once walls are open, and rot, mold, asbestos or lead show up in older homes. In a home built before 1978, Washington's lead renovation rules (chapter 365-230 WAC) apply to paid work that disturbs paint. We look for the signs at the walkthrough and price any repair in writing before we fix it.

Living in the house is the other difference. For a refresh, many families stay while we phase the work. For layout changes or a gut renovation, moving out for the main phase is safer and faster.

When is new construction the right choice?

New construction fits three cases. The lot is empty. The family needs space the house cannot give, so an addition or a DADU adds square footage. Or the structure itself is the problem, and a rebuild replaces it.

More room does not always mean building up. Building out is usually cheaper per square foot, because a second story needs the existing structure reinforced, a new stair and a roof rebuilt. Building out needs a new foundation instead. Finishing space the house already has, such as an unfinished basement, is a remodel: it starts at $60,000+ and adds living space inside the existing walls.

When is remodeling or renovation the right choice?

When the foundation and frame are sound, keep the structure and let the problem set the scope. If the finishes are worn but the rooms work, renovate. If the plan is wrong, with closed off rooms or a kitchen with no room for a table, remodel and move the walls. If the wiring and plumbing are failing too, a gut renovation replaces them while the walls are open.

One whole house project usually costs less per room than separate jobs, and we can phase it on one plan. See Whole Home Remodeling Across the Greater Seattle Area.

What have our own remodels and renovations cost?

Three of our recent jobs show the range. A Renton condo finished in 2024 cost about $150,000. It was mostly renovation: one plank floor and fresh paint through every room, two refitted bathrooms and updated electrical and plumbing, while the kitchen kept its cabinets and granite.

A Seattle condo kitchen was a remodel. We removed the wall that closed the 1980s galley off from the living room, reframed the ceiling and rebuilt the kitchen around an island. The work ran from 2022 into early 2023 and cost about $90,000.

In a Kirkland condo (see Home Remodeling Contractors in Kirkland, WA), we replaced a corner tub and a small shower stall with one walk-in shower. That bathroom took about 13 weeks in 2023 and cost about $40,000.

Each price is from the year the job was done. Material and labor costs have risen since, so 2026 prices start at the table above. We work across the city and the Eastside: see Home Remodeling Contractors in Seattle, WA.