City of Castle Rock

Building permits are required for all construction within the City of Castle Rock.

Note: Contact Castle Rock City Hall for specific exemption information. Generally, minor repairs and maintenance may be exempt if they do not affect structural elements, egress, or fire safety.

Building code

2021 International Building Code (IBC) with Washington State amendments; 2021 International Residential Code (IRC); assumed baseline codes consistent with county adoption, though not explicitly verified

Permit validity

Site plan approval expires in 6 months (one 6-month extension available).

Contractor requirements

Contractors must comply with City of Castle Rock requirements and maintain appropriate registration.

1. 01
   Determine your project type (Type I, II, III, or IV) based on complexity.
2. 02
   Submit application to City Clerk-Treasurer's office on forms provided by the City.
3. 03
   Include all required site plan and documentation for your project type.
4. 04
   Pay required application and review fees.
5. 05
   City Clerk-Treasurer's office routes application to appropriate review bodies.
6. 06
   Receive decision and, if approved, proceed to building permit stage if applicable.
7. 07
   Submit building permit application after site plan approval (if required).

Typical processing time: Type I (single-family/minor projects): 10 working days from complete application. Type II/III/IV: Varies; includes committee review.

Contact City Hall at (360) 274-8181 for current fee schedule and payment methods.

• (360) 274-8181 (phone)

Typical sequence: Inspections required throughout construction. Final inspection required for occupancy.