Deck rules & permits in Montgomery Township, PA

Low decks vs. the building envelope

A deck whose floor is no more than 3 feet above grade where it meets the house, that has no walls or roof, has railings no more than 4 feet high, and reaches no more than 8 feet above grade at any point, may use the ordinance's relaxed setback standards. A deck that does not meet all of those limits must be located within the building envelope — the district's full required yards.

Source: Montgomery Township Code — Zoning, Art. XXI, Miscellaneous Provisions (eCode360)

Setbacks vary by district

The applicable setback depends on your zoning district and on whether the deck qualifies for the relaxed standard above. Confirm the exact figure for your lot with Planning & Zoning.

Source: Montgomery Township — Planning & Zoning

Call 811 before you dig

Pennsylvania law requires calling PA One Call (dial 811 or visit pa1call.org) at least 3 business days before any digging — including fence post holes — so underground utilities can be marked for free.

Source: Pennsylvania One Call System (PA 811)

Deck construction code (PA UCC / IRC)

In Pennsylvania, deck construction is governed by the Uniform Construction Code (UCC), which adopts the International Residential Code (IRC). A building permit is required for a deck that is more than 30 inches above grade at any point, is attached to the house, or is over 200 square feet. These state-level construction rules apply on top of your township's zoning (setbacks and coverage).

• Permit trigger: a building permit is required if the deck is more than 30 inches above grade at any point, is attached to the house, or exceeds 200 square feet. A low, freestanding, ground-level deck may be exempt — confirm with your township.
• Footings: deck footings must extend below the frost line — about 36 inches in southeastern Pennsylvania — so the deck doesn't heave in winter.
• Guardrails: any walking surface more than 30 inches above grade needs a guardrail at least 36 inches high, with openings that won't pass a 4-inch sphere (balusters less than 4 inches apart).
• Stairs: a stairway with four or more risers needs a graspable handrail, and treads and risers must be uniform.
• Ledger attachment: a deck attached to the house must be bolted (through-bolts or lag screws) and flashed to keep water out — nailing it on is not code-compliant and is a common cause of deck collapses.
• Inspections: the UCC requires staged inspections — footings before concrete is poured, framing after the structure is up, and a final inspection.

Exact figures depend on the code edition your municipality enforces and on site conditions (soil, deck height). The township building department confirms the specifics at permit time, and a deck permit normally includes footing, framing, and final inspections.

Source: PA Uniform Construction Code / International Residential Code — residential deck requirements

Property lines

You are responsible for building on your own property. If you are not certain where your property line is, find your official plot plan (often included with closing documents), check the county GIS map, or hire a surveyor. Building over the line can mean rebuilding the fence at your own cost.

Easements

Drainage, utility, and access easements commonly cross residential lots. Most townships restrict or prohibit fences in easements, and a utility can remove a fence built in one. Your deed and recorded plot plan show easements.

HOA rules

If your home is in a homeowners association, HOA rules apply on top of township rules and are often stricter (style, color, height, approval process). Get HOA approval in writing before applying for the township permit.

Corner lots and sight triangles

Corner lots usually face extra restrictions near intersections so drivers can see cross traffic ('clear sight triangles'). If you are on a corner, ask the township specifically about street-side fence rules.