Building permits in Matanuska-Susitna Borough, Alaska
Find the right authority before you build. Matanuska-Susitna Borough permitting follows Alaska law — here is exactly who issues the permit and where to start.
County + cities (mixed)
Matanuska-Susitna Borough — Development Services (Permit Center)
The Mat-Su Borough does not enforce a residential building code, so no building permit is generally required for dwellings in the borough at large (driveway/right-of-way and on-site septic approvals still apply). Within the cities of Palmer and Wasilla, the municipal building departments issue the few local building permits. The borough Permit Center handles land-use, driveway, and right-of-way permits.
Open the official permit portal →
Even where no building permit is required, banks, insurers, and resale inspections often expect code-compliant construction; on-site wastewater (septic) approval routes through the state (AK DEC) or a licensed engineer.
Permit cheat-sheet (Alaska rules)
| Project | Permit? | Authority | Typical fee | Timeline | Go / No-Go | Key notes |
|---|---|---|---|---|---|---|
| 🏠 Accessory Dwelling Unit (ADU) | Permit required | city | Valuation-based; set by the municipality or borough. | — | Case by case | Alaska has no statewide ADU law. ADUs are allowed only where the local zoning ordinance permits them (rules vary by municipality — Anchorage, Fairbanks, and the boroughs each set their own). When an ADU is permitted by zoning, a full building permit is required. |
| 🪵 Deck / Porch | Conditional | city | Valuation-based; set by the municipality. | Anchorage initial plan review ~1–3 days; full review longer for complex decks. | Generally allowed | Frost-depth footings are required for every deck — Fairbanks frost depth commonly reaches 60+ in and Anchorage ~40–60 in. Footing inspections occur before concrete is poured. Exempt: Anchorage requires a permit for decks more than 30 in above grade and within 3 ft of grade. |
| 🧱 Fence / Wall | Conditional | city | Usually no building permit for typical residential fences; zoning/height rules apply. | — | Generally allowed | Snow-storage and sight-triangle rules may apply on corner lots. Exempt: Most Alaska jurisdictions exempt ordinary residential fences under 6–7 ft from a building permit. |
| 🛖 Shed / Outbuilding | Conditional | city | Valuation-based; set by the municipality. | — | Generally allowed | Even small sheds in permafrost or frost-prone areas should consider frost-free skid foundations. Exempt: One-story detached accessory buildings ≤120 sq ft are exempt per IRC R105.2; Anchorage exempts small detached tool/storage sheds under that threshold. |
| 🪜 Basement Finish | Permit required | city | Valuation-based; includes trade permits. | Anchorage initial plan review ~1–3 days; full review longer for finished-basement conversions. | Generally allowed | Basements are uncommon in much of Alaska; where built, frost-protected foundations and egress windows are reviewed. |
| 🚗 Garage / Carport | Permit required | city | Valuation-based; includes trade permits. | — | Generally allowed | New garages require a full building permit, frost-depth footings, and plan review. |
| ☀️ Rooftop Solar PV | Permit required | city | Building + electrical permits; fee set by the municipality. | — | Generally allowed | Alaska energy code (AHFC Building Energy Efficiency Standards / BEES) applies; structural snow-load review for roof-mounted arrays. |
| 🌡️ HVAC Replacement | Conditional | city | Mechanical permit; fee set by the municipality. | — | Generally allowed | Alaska requires licensed mechanical contractors; cold-climate ventilation and combustion-air details are reviewed. |
| 🍳 Kitchen Remodel | Conditional | city | Valuation-based when structural, plumbing, or electrical work is included. | — | Generally allowed | Cold-climate envelope and ventilation requirements follow the Alaska energy code. |
| 🛁 Bathroom Remodel | Conditional | city | Valuation-based when plumbing is relocated. | — | Generally allowed | Ventilation to the exterior is required; freeze protection for plumbing is reviewed. |
| 🏗️ Room Addition | Permit required | city | Valuation-based; includes trade permits. | Anchorage initial plan review ~1–3 days; full review longer for additions. | Generally allowed | Additions require frost-depth foundations/engineering and setback/zoning review. |
| 🪟 Window / Door Replacement | Conditional | city | Usually no fee for in-kind swaps; a permit is needed if the opening is enlarged. | — | Generally allowed | Replacement products must meet the Alaska energy code when the code is triggered. Exempt: Same-size, in-kind window/door replacement is generally exempt. |
| 🏘️ Roof Replacement | Conditional | city | Often over-the-counter or exempt for same-footprint re-roof. | — | Generally allowed | Alaska snow-load and ice-dam (ice-barrier) requirements are reviewed for roof assemblies. Exempt: Same-material, same-slope re-roof is often exempt or over-the-counter; structural deck changes require a permit. |
| 🅿️ Driveway / Parking Pad | Conditional | city | Building permit often not required; curb-cut/right-of-way work is separate. | — | Generally allowed | Drainage and erosion control matter in Alaska; a separate right-of-way permit is needed to cut the curb. Exempt: Replacing a driveway in the same footprint (no new curb cut) is generally exempt. |
| 🏊 Swimming Pool / Spa | Permit required | city | Valuation-based; includes barrier/fencing and electrical bonding review. | — | Generally allowed | Short building season and frost considerations for pool decks; code-compliant barrier required. |
| 🧱 Retaining Wall | Conditional | city | Valuation-based when over the height threshold. | — | Generally allowed | Frost heave and drainage are major design factors for retaining walls in Alaska. Exempt: Retaining walls ≤4 ft above grade and not supporting a surcharge are generally exempt. |
| 💥 Demolition / Teardown | Permit required | city | Valuation-based; set by the municipality. | — | Generally allowed | A demolition permit is required before tearing down a house or attached structure. Municipalities require utility disconnects (electric, gas, water, sewer) and an asbestos/lead-paint clearance for pre-1978 homes before demolition; Anchorage issues demolition permits through Development Services. |
| 🚰 Septic System | Permit required | county | Permit fee set by the local environmental health authority; engineered systems cost more. | — | Generally allowed | New or replacement onsite wastewater (septic) systems require a permit from the Alaska Department of Environmental Conservation / local environmental health authority. A soil/perc evaluation and engineered design are typically required; conventional systems need a certified installer, and some areas (e.g., Anchorage, Valdez) run their own programs. |
| 🔌 EV Charger | Conditional | city | Electrical permit; fee set by the municipality. | — | Generally allowed | Home EV charging (240V branch circuit + wall-mounted EVSE) requires an electrical permit and must meet the NEC (Article 625). Many municipalities fast-track residential EVSE. A load calculation and possible service upgrade are reviewed. |
| ⚡ Standby Generator | Conditional | city | Mechanical/electrical permit; fee set by the municipality. | — | Generally allowed | A permanently installed standby generator requires mechanical and electrical permits (transfer switch, fuel gas/propane line). Setback, carbon-monoxide ventilation, and noise rules apply; some HOAs restrict generator placement. Cold-climate starting provisions are reviewed. |
Frequently asked questions
Who issues building permits in Matanuska-Susitna Borough, Alaska?
Matanuska-Susitna Borough — Development Services (Permit Center) is the permitting authority for Matanuska-Susitna Borough. Permitting is split — cities issue for incorporated areas, the county for unincorporated areas. Start at the official portal linked above.
Do I go to the county or my city for a building permit in Matanuska-Susitna Borough?
Permitting is split — cities issue for incorporated areas, the county for unincorporated areas.
What home projects need a permit in Matanuska-Susitna Borough?
The same project types shown in the cheat-sheet above (ADU, deck, fence, shed, solar, and more) — rules follow Alaska state law. Whether the county or your city issues it depends on your property's incorporation status.
How do I apply for a permit in Matanuska-Susitna Borough?
Use the official permit portal linked above. Most offices accept online submissions; have your plans, site information, and contractor details ready before applying.