Duvall DADU Permit Fees: What Will You Pay?
Duvall does not publish one flat, all-inclusive DADU permit price. Its adopted 2026 schedule separates building permits, plan review and other charges. Building plan review is 65% of the building permit fee; a pre-application meeting is listed at $250.
Sources checked November 5, 2026. Confirm the requirements for your parcel with its permitting authority.
Which published fees are useful for early budgeting?
| 2026 schedule item | Published basis | Budget implication |
|---|---|---|
| Building plan review | 65% of the building permit fee | Calculate from the applicable building fee, not construction cost. |
| Pre-application meeting | $250 flat fee | Separate from detailed design and construction. |
| Additional plan review | $111.90 per hour | A revision can create review work beyond the initial package. |
These selected items come from Duvall’s adopted schedule. They are not a permit quote and do not include every applicable charge. Ask the city to identify the categories for the proposed DADU before adding them to the project budget.
Official guidance: Duvall adopted 2026 fee schedule, Resolution 25-11.
How does the 65% calculation work?
For an arithmetic example, assume the applicable building permit fee is $1,000. The building plan-review charge at 65% would be $650. Together those two assumed items would be $1,650, before other fees. The $1,000 starting figure is illustrative, not a quoted Duvall fee for a particular cottage.
This distinction matters when comparing estimates. “Permit fees included” should identify which charges are included and which are allowances or owner payments. A planning meeting, a utility connection and a building permit should not be silently combined into one unexplained line.
What other costs should the fee request identify?
- The building valuation or fee basis the city will use.
- Applicable trade, site, utility, impact and recording charges.
- Which charges are due at application and which are due later.
- Whether changes or additional review are billed separately.
Send the city the proposed floor area, building type, site address and utility approach. If a major item is unresolved, request the fee assumption for each alternative rather than treating one provisional estimate as final.
How do city fees fit into the complete DADU budget?
Keep public fees separate from survey, design, engineering, private utility construction and the building itself. This lets you update a city charge without obscuring a change to construction scope.
TimberworX can discuss the property in a free initial consultation. Detailed design and budgeting are paid preconstruction services. Use that stage to document the inclusions and unresolved items behind the project estimate.
A few things to know
Is 65% charged against the construction budget?
The listed building plan-review percentage applies to the building permit fee.
Is the $250 meeting the complete DADU design fee?
No. It is the city’s listed pre-application meeting charge. Design and preconstruction are separate services.
Keep planning
Duvall DADU Permits: What You Need to Know
Duvall DADU permits explained: where to apply, the recorded ADU notice, zoning checks and the documents to prepare for a backyard cottage.
Eastside DADU Permit Costs: Duvall and Bothell Examples
Compare published DADU permit charges in Duvall and Bothell, Kirkland plan licensing and the separate scope behind a construction estimate.
What permits do you need for a DADU?
A practical DADU permit checklist covering site plans, building review, utilities, trade permits and final inspections.