Builder's Risk insurance
A Course of Construction / Builder's Risk policy covers the structure during construction (fire, theft, vandalism, weather damage, sometimes more). Lender-required if you're financing.
- Cost: $500 – $1,500 for a 6-month policy, or 1–4% of completed value annually.
- Notify your homeowner's carrier before construction starts — many policies require disclosure or attach a construction endorsement.
- After substantial completion, swap to a landlord/dwelling fire policy if the cottage is being rented.
Verify any insurance agent or producer at the Oregon Division of Financial Regulation — Oregon's insurance regulator under DCBS.
Financing draw schedule
If you're using construction financing (HELOC, cash-out refi, renovation loan, or one-time-close construction-perm), align the lender's draw schedule with the GC contract milestones. The standard sequence:
- Initial draw at mobilization (or covered by your deposit).
- Foundation completion.
- Framing / dry-in.
- MEP rough complete.
- Drywall complete.
- Substantial completion / Certificate of Occupancy.
Each draw needs a lender inspection. Build in a few business days of lag at each milestone — the GC mobilizes the next phase only after the draw is funded.
A note on financing
HomePlan doesn't provide financial advice. The patterns most Portland DADU owners describe:
- Appraisal often lags real construction cost. ARV (after-renovation value) on Portland DADU comps is still relatively thin in many neighborhoods.
- GSE cash-out is capped at 80% LTV — a hard limit for owners with sub-4% mortgages locked in 2020–2022 who don't want to refinance.
- The actual exit is a refinance after stabilization — short-term debt during the build, refinance into conventional once the unit is income-producing or has a year of seasoned equity.
Verify any lender or mortgage loan officer at NMLS Consumer Access.
Where this information came from
- Oregon Division of Financial Regulation — Insurance · retrieved May 1, 2026
- NMLS Consumer Access — verify any mortgage loan officer · retrieved May 1, 2026