What requires a permit on Oahu?
Most construction work in Honolulu requires a building permit before you start. The rule of thumb: if it's structural, adds square footage, changes your roofline, or involves electrical or plumbing, you need one. The exceptions are narrower than most people expect.
- Fences under 6 feet (non-retaining)
- Interior painting and flooring
- Cabinet replacement (no structural change)
- Minor repairs under $1,000 value
- Small tool sheds under 200 sq ft
- Replacing fixtures with same-size units
- Any new structure or addition
- Structural wall removal or addition
- Re-roofs in most cases
- Electrical panel upgrades
- Solar PV installation
- Swimming pools and spas
- ADU / ohana unit construction
- Any work in a flood or SMA zone
Unpermitted work on Oahu can result in fines, stop-work orders, and being forced to tear out completed work. It also comes up in title searches when you sell — buyers can demand you legalize it or reduce the price. The cost of a quick phone call to DPP is zero.
How to apply for a building permit on Oahu
Since 2020, DPP requires all permit applications to be submitted through their ePlans electronic plan review system. There are no walk-in plan submittals. Here is the full process from start to finish.
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Determine your permit typeDPP issues several permit types: Building Permit (BP), Electrical Permit (EP), Plumbing Permit (PP), and Grading Permit. Most residential projects need a Building Permit plus trade permits. Identify which combination applies before you start gathering documents.
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Prepare your plan setYou'll need: a site plan showing your property boundaries and structure location, floor plans (existing and proposed), elevations, and structural plans if you're making any structural changes. Projects over certain values require licensed architect and/or structural engineer stamps. Plans must be in PDF format for ePlans upload.
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Create an ePlans account and submitGo to dpp.honolulu.gov and create an account in the ePlans portal. Fill out the permit application online, upload your plan PDFs, and pay the initial processing fee. You'll get a project number immediately — save this for all future correspondence.
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Plan check review beginsDPP assigns your project to a plan checker. They review for code compliance across multiple disciplines: zoning, building, electrical, plumbing, fire. Expect at least one round of Deficiency Response Comments (DRC) — a list of corrections required before approval.
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Respond to DRC commentsThis is where most projects stall. You or your architect resubmit corrected plans via ePlans. DPP reviews again. Commercial projects often go through 2–3 rounds. Residential projects typically see 1–2 rounds. Each round adds 4–8 weeks to your timeline.
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Pay permit fees and pull the permitOnce all DRC comments are resolved, DPP issues a fee notice. Pay online through ePlans. After payment clears, you download your permit documents. Post the permit visibly at the job site — inspectors will look for it.
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Schedule inspectionsYour permit will list required inspection stages (foundation, framing, rough-in, insulation, final). Schedule each through the DPP inspection line or online. You cannot pour concrete or close walls before the relevant inspection passes.
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Receive your certificate of completionAfter the final inspection passes, DPP issues a Certificate of Completion (CC) or Certificate of Occupancy (CO). This is the document that confirms your project is legally permitted and complete. Keep it with your property records.
For large or complex projects, hiring a DPP-approved third-party reviewer can cut your review time significantly. TPRs conduct their own plan check before DPP, which reduces correction rounds. They charge an additional fee (typically $2,000–8,000) but can save months on large projects.
Realistic DPP timeline
DPP timelines have improved since 2022 but remain long by mainland standards. Here is what to plan for on a typical residential addition or ADU project.
If your project has any complexity — structural changes, ADU, SMA zone, or commercial use — budget for a 6-month permit timeline before construction starts. Starting your design process early and hiring an experienced local architect who knows DPP's preferences will shave the most time.
DPP permit fees explained
Oahu permit fees are calculated based on your project's construction value. They are paid in two stages: a processing fee at submission, and the full permit fee at approval. Here are typical ranges for common projects.
| Project type | Construction value | Est. permit fee | Plan check fee | Est. total |
|---|---|---|---|---|
| Re-roof | $15,000 | $240 | $156 | ~$420 |
| Kitchen remodel | $40,000 | $448 | $291 | ~$780 |
| Room addition (400 sq ft) | $120,000 | $960 | $624 | ~$1,680 |
| ADU / ohana unit | $200,000 | $1,840 | $1,196 | ~$3,220 |
| New single-family home | $600,000 | $4,800 | $3,120 | ~$8,400 |
| Solar PV system | $25,000 | $220 | $143 | ~$385 |
Fees above are estimates based on DPP's published fee schedule. Actual fees depend on final construction valuation, permit type, and whether a state surcharge applies. Use our fee estimator tool for a custom calculation.
What the fees cover
Your Oahu permit fee pays for plan check review across all disciplines (building, electrical, plumbing, fire) plus inspection labor. The plan check fee (roughly 65% of the building permit fee) funds the actual review staff time. There is also a small state surcharge on all building permit fees that goes to the Hawaii State Building Code Council.
Fees are calculated on construction value — so accurate (not inflated) valuations keep fees reasonable. Your contractor or architect typically provides the construction value estimate on the application. Don't pad it unnecessarily.
Owner-builder permits on Oahu
Oahu allows property owners to pull permits for work on their own residence without hiring a licensed contractor. This is called an owner-builder permit. It can save money on contractor overhead, but comes with a significant restriction most people don't know about.
If you pull an owner-builder permit on Oahu, you cannot sell the property for two years after the permit is finaled. This rule exists to prevent property flippers from doing unprofessional work and immediately passing it to a buyer. If you plan to sell within two years of completing work, use a licensed contractor instead.
Who qualifies for an owner-builder permit?
- You own the property where work is being done
- You intend to occupy the property (not purely an investment or rental)
- You are doing the work yourself or with unpaid help (family, friends)
- You understand and accept the 2-year resale restriction
What you still need
Even as an owner-builder, you are responsible for meeting all code requirements. Licensed subcontractors are required for electrical and plumbing work — you cannot do your own electrical as an owner-builder unless you hold an electrician's license. Your plans still go through the same DPP review process.
5 mistakes that delay Oahu permits
These are the most common reasons projects sit in DPP for months longer than they need to.