Home Remodeling in
Montesano, WA
Montesano sits where the Wynoochee River meets the Chehalis. If your lot is in the mapped floodplain, a floodplain development permit comes before anything else.
Remodeling in Montesano
What building in Montesano actually involves
Montesano is the county seat of Grays Harbor County, home of the domed 1911 courthouse, and had 4,138 residents at the 2020 census. The city sits on the north slope of the Chehalis River valley, close to where the Wynoochee River joins it.
That geography matters for building. A house up the slope and a house on the low ground near the rivers can face quite different requirements for the same addition.
Check the floodplain first
Montesano regulates land flooded by the Chehalis River and its tributaries under its Flood Damage Prevention chapter, MMC 17.40. Development inside a special flood hazard area needs a floodplain development permit from the city's floodplain administrator.
The administrator compares your site's elevations with the base flood elevation to decide whether you are inside the regulated area. If you disagree with that decision, the code allows an appeal to the hearings examiner.
FEMA has also studied the Chehalis, Satsop and Black rivers and proposed revisions to local flood maps, with a public open house held in Montesano. Check the current map for your lot rather than relying on an older one.
Local ADU rules, not the state's
The 2023 state ADU law, HB 1337, binds cities in counties that fully plan under the Growth Management Act. Grays Harbor County plans under only part of it, so Montesano is not covered, and its own zoning code decides what accessory units are allowed.
Before paying for ADU plans, ask the building office which standards apply to your lot. On a floodplain lot, the flood rules will shape the design as much as the zoning does.
Who issues permits
Montesano's building office is at City Hall, 112 N. Main St., on (360) 249-8511. The main City Hall line is (360) 249-3021.
City requirements on this page were last checked on 19 September 2026. Codes change, so confirm current standards with the city before you apply.
What We Build
Our services in Montesano
Client Reviews
What our clients say
“Chris, owner of KOI build is a great guy. He personally made sure that the reconstruction of our deck was as we wanted and made sure his workers were following the things we expected. They did a great job on a hard project. All supplies and costs were explained and options given. After completion the work site was thoroughly cleaned everything hauled away. Everyone working on the project was very personable. Chris went out of his way to make sure we were happy with the results even coming over and doing painting on a Sunday to help out. This is a good company with very nice and helpful people. I would highly recommend them for any home improvement needs.”
Deck construction
“Chris and his crew are very friendly and professional. They did an awesome job. The house looks great. They made sure all garbage and paint was cleaned up. Very pleased with this company. Would use them again.”
Exterior painting
Common Questions
Remodeling in Montesano, answered
Do I need a floodplain permit in Montesano?
If your project is inside a special flood hazard area, yes. Montesano requires a floodplain development permit under MMC 17.40, and the floodplain administrator decides using the base flood elevation.
Does the state ADU law apply in Montesano?
No. HB 1337 covers cities in counties that fully plan under the Growth Management Act, and Grays Harbor County plans under only part of it. Montesano's own zoning code applies.
Where do I get a building permit in Montesano?
From the building office at City Hall, 112 N. Main St., on (360) 249-8511.
Do you work in Montesano?
Yes. We take remodels, additions, ADUs and decks in Montesano. Call (253) 348-1847 for a free estimate.
Service Area
Where we work in Montesano
More Areas
Other areas we serve
- ElmaGrays Harbor County
- McClearyGrays Harbor County
- LaceyThurston County
- TumwaterThurston County
- YelmThurston County
- SheltonMason County
- TeninoThurston County
- TacomaPierce County
- LakewoodPierce County
- PuyallupPierce County
- Gig HarborPierce County
- SteilacoomPierce County
- DuPontPierce County
- SpanawayPierce County
- CentraliaLewis County
- ChehalisLewis County
- OlympiaThurston County
- FircrestPierce County
- University PlacePierce County
- EdgewoodPierce County
- MiltonPierce County
- Browns PointPierce County
- Lake TappsPierce County
- RochesterThurston County
- Grand MoundThurston County
- RoyPierce County
- RainierThurston County
- BucodaThurston County
- WinlockLewis County
- AllynMason County
- SeattleKing County
- KentKing County
- AuburnKing County
- BremertonKitsap County
Planning a project in Montesano?
Free estimates, and a straight answer on what your project will cost and how long it will take.
Also serving Olympia, Tumwater and the wider South Puget Sound.