Do I need a permit for a deck in Franklin?

Yes, if it's attached to your house and over 30 square feet, or detached and over 200 square feet. A 12×16 attached deck (192 sq ft) is right at the threshold and will need a permit. Detached decks under 200 sq ft with no electrical service do not require a permit — but verify this with the building department before you build because some cities have different thresholds. Ledger-board connections and 48-inch frost-depth footings are the two things inspectors focus on.

What is Franklin's frost depth and why does it matter?

Franklin has a 48-inch frost depth due to glacial till soils and Wisconsin's freeze-thaw cycles. This means any footing, foundation, or deck post must bottom out 48 inches below grade and rest on undisturbed soil. The IRC baseline is 36 inches, but Wisconsin requires 48 inches statewide. If you dig a deck footing to 36 inches, it will fail inspection and may heave in winter, separating the deck from the house or tipping posts. Always dig the full 48 inches.

Can I pull a permit myself as the homeowner in Franklin?

Yes, for most residential work on an owner-occupied property. You can pull the building permit and do the carpentry, framing, and finishing yourself. However, you cannot pull electrical subpermits — a licensed electrician must file those. Same with plumbing subpermits — a licensed plumber must file. Get your licensed trades involved early and have them understand that you are the general contractor and owner, not them.

How much does a permit cost in Franklin?

Permit fees vary by project type. Fences are flat-fee ($75–$150). Decks under 200 sq ft run $150–$300. Larger projects (additions, finished basements) typically cost 1–2% of project valuation, or $300–$1000+. Some municipalities charge a separate plan-review fee; others bundle it. Call the building department or visit City Hall to get a written fee schedule before you file.

How long does plan review take in Franklin?

Routine permits (fences, small sheds) process over-the-counter or in 1–2 weeks. Structural projects (decks, additions, roofs) typically take 2–4 weeks for plan review. Finished basements with bedrooms and egress windows take 3–4 weeks. Complex additions may take 6 weeks or longer if the department requests revisions. Ask for an estimated timeline when you file.

Do I need a permit for a shed in Franklin?

Sheds under 200 sq ft with no electrical service and no habitable use (e.g., not a tiny home or ADU) are often exempt. Anything over 200 sq ft, or anything with utilities, requires a permit. Footing inspection is mandatory — you'll need to dig to 48 inches. Call the building department before you build to confirm the exemption; size and utility status determine whether you need a permit.

What about pool fences in Franklin?

Pool barriers always require a permit, regardless of height. The barrier must meet IBC R3109 (four-sided enclosure, 4-foot minimum height, 4-inch sphere rule for spacing, self-closing and self-latching gate). Franklin requires a separate inspection of the gate latch and spacing. Permit fee is typically $125–$200 because it involves a dedicated inspection. File this before you install the fence.

Does Franklin allow online permit filing?

No. As of this writing, Franklin does not offer online permit filing. You will file in person at City Hall or by phone. Call the building department to ask about the current intake process and any COVID-era changes to in-person filing. Bring a completed application, site plan, and any required drawings when you visit.

Building Permits in Franklin, WI (2026)

Do I need a permit in Franklin, Wisconsin?

Franklin is a suburb south of Milwaukee in Milwaukee County, built on glacial till with a 48-inch frost depth — a critical detail for any foundation work. The City of Franklin Building Department administers permits under the Wisconsin Building Code (2015 edition with state amendments). Like most Milwaukee-area suburbs, Franklin has straightforward permit rules but enforces them consistently. The city's frost depth is deeper than the IRC baseline (36 inches), which affects deck footings, shed foundations, and any concrete work. Owner-builders can pull permits for owner-occupied residential work, though electrical and plumbing subpermits usually require a licensed contractor. Most routine permits (fences, sheds, decks under 200 square feet) process in 2-3 weeks. Structural work, additions, and finished basements take longer — typically 4-6 weeks for plan review plus inspection scheduling. The building department does not offer online filing as of this writing; you'll apply in person at Franklin City Hall or by phone to confirm current intake procedures.

What's specific to Franklin permits

Franklin's 48-inch frost depth is the first thing to get right. The IRC R403.1.4.1 baseline is 36 inches; Wisconsin adopted 48 inches statewide because of frost heave risk in the region. This matters for decks (footings must bottom out at 48 inches, not 36), any shed or outbuilding foundation, concrete slabs in unheated spaces, and ground-level additions. Many DIY builders miss this and get stopped at footing inspection. If you're posting a deck or shed, plan to dig 4 feet deep and go to undisturbed soil — frost heave will pop a shallow footing in 2-3 years.

Franklin requires a permit for decks over 30 square feet if they're attached to the house; detached decks over 200 square feet also need a permit. A 12×16 deck (192 sq ft) attached to your house will need a permit and structural calculations. Stairs, railings, and the ledger board connection get scrutinized — the ledger-to-band-board detail is the #1 source of rejection because improper fastening causes separation and collapse. Bring a site plan showing setbacks if your deck is within 10 feet of a property line.

Fences in Franklin follow the standard Wisconsin model: permits required for fences over 6 feet tall in any yard, all masonry walls over 4 feet, and any fence in a corner-lot sight triangle (even at 4 feet). A standard 6-foot wood privacy fence in a rear yard does not require a permit. Pool barriers always require a permit regardless of height; the building department inspects the gate latch and spacing per IBC R3109. Fence permits are straightforward — $75–$150 flat fee, over-the-counter processing if the lot is not in a variance zone.

Franklin's building department processes owner-occupied residential work without a general contractor license if you pull the permit yourself. However, electrical subpermits must be pulled by a licensed electrician, and plumbing subpermits must be pulled by a licensed plumber. This trips up a lot of DIY owners who think they can handle the whole job themselves. You can do the work; you cannot file the electrical or plumbing permit as the owner. Get your licensed trades on board before plan submission.

The city adopted the 2015 Wisconsin Building Code, which tracks the 2015 IRC and IBC. Energy code is Wisconsin Administrative Code SPS 323, which is more stringent than the base IRC on insulation and air sealing. Additions and finished basements will be examined for compliance with current energy code, not the code that was in effect when the original house was built. This sometimes means upgrading rim joists or adding rim insulation on basement projects that touch the perimeter.

Most common Franklin permit projects

The projects below are the ones Franklin homeowners file most often. Click through to see what triggers a permit, what doesn't, typical costs, timelines, and filing steps.

Decks

Attached decks over 30 sq ft and detached decks over 200 sq ft require a permit in Franklin. Structural calculations, ledger-board detail, and 48-inch frost-depth footings are the sticking points. Permit fee is typically $150–$300; plan review takes 2–3 weeks.

Roof replacement

Roof replacements under the same footprint do not require a permit in most Wisconsin jurisdictions, including Franklin. New roof structure, dormers, or reconfigured rooflines require a permit.

Basement finishing

Basement finishing with bedrooms, kitchenettes, or significant HVAC changes requires a permit. Egress windows are mandatory for bedrooms. Energy code upgrades (rim insulation, air sealing) are often required. Plan review 3–4 weeks; permit fee $200–$500.

Do I need a building permit in Franklin, WI?