Average Building Permit Fees by Project Type
Permit fees vary significantly by jurisdiction and project type. Most cities charge either a flat fee (common for trade permits like electrical or plumbing) or a percentage of the project's total valuation (common for structural work). The table below shows typical national averages — use the calculator above for a personalized estimate.
| Project Type | Typical Fee Range | Fee Method | Approval Time |
|---|
| 🏠 Roofing | $100 – $400 | Flat fee | 1–3 weeks |
| ❄️ HVAC | $100 – $300 | Flat fee | 1–2 weeks |
| ☀️ Solar Panels | $150 – $500 | Flat / per kW | 2–5 weeks |
| 🍳 Kitchen Remodel | $150 – $1,500+ | 0.8–1.8% of cost | 2–6 weeks |
| 🚿 Bathroom Remodel | $100 – $900+ | 0.6–1.5% of cost | 2–4 weeks |
| 🏗️ Room Addition | $500 – $5,000+ | 1.5–2.5% of cost | 6–16 weeks |
| 🏠 ADU | $500 – $4,000+ | 1.2–2.2% of cost | 4–12 weeks |
| 🪵 Deck / Patio | $150 – $1,200+ | 0.8–1.8% of cost | 2–6 weeks |
| 🏡 Fence | $50 – $200 | Flat fee | 1–3 weeks |
| ⚡ Electrical | $75 – $250 | Flat fee | 1–3 weeks |
| 🔧 Plumbing | $75 – $300 | Flat fee | 1–3 weeks |
| 🪟 Window Replacement | $75 – $200 | Flat fee | 1–2 weeks |
| 🔨 Demolition | $100 – $500 | Flat / % of cost | 2–5 weeks |
| 🏛️ New Construction | $500 – $8,000+ | 1.5–2.5% of cost | 8–24 weeks |
* Fees shown are national averages. Actual fees vary by city and county. Always verify with your local building department.
Frequently Asked Questions
How much does a building permit cost? +
Most permits cost 1–2% of the project's total value, with minimum fees of $50–$500. Flat-fee permits (electrical, plumbing, HVAC) typically run $75–$350. Major projects like new construction or room additions can cost $1,000–$8,000+ in permit fees. Use the calculator above for a project-specific estimate.
How much does a roofing permit cost? +
Roofing permits typically cost $100–$400 as a flat fee for residential reroofing. Some jurisdictions calculate it as 0.5–1% of the project cost for larger jobs. The permit usually covers 1–2 inspections: a rough inspection and a final.
How much does a solar panel permit cost? +
Solar permits typically cost $150–$500 for residential systems. Some jurisdictions charge per kilowatt of system capacity. The permitting process includes a building department review and utility interconnection approval, usually taking 2–5 weeks total with 2–3 inspections.
Do I need a permit for an ADU? +
Yes. ADUs (Accessory Dwelling Units) require permits in virtually all US jurisdictions. Fees run 1.2–2.2% of project cost with a $500 minimum. Many California cities offer ADU fast-track programs that can reduce approval to 4–6 weeks. The permit covers building, electrical, plumbing, and mechanical work.
What happens if you build without a permit? +
Building without a permit can result in fines ($500–$5,000+), required teardown of the unpermitted work, insurance claim denials, and inability to sell your home. When discovered during a home sale, unpermitted work typically costs $5,000–$50,000 to resolve or causes the deal to fall through entirely.
How long does permit approval take? +
Approval time ranges from 1 day (over-the-counter permits for simple electrical/plumbing) to 6+ months (new construction in high-demand jurisdictions). Most residential projects take 2–8 weeks. Submitting complete plans digitally and calling the permit office before submitting can shave 1–3 weeks off the timeline.