A waterfall spilling over rocks in Ricketts Glen State Park in Pennsylvania.

Tiny Homes in Pennsylvania: Laws, Rules and Communities

Updated November 4, 2026. Some laws may have changed since then. Confirm with your municipality before you buy land or a home.

The short answer

Yes, you can live in a tiny home full time in Pennsylvania, on a permanent foundation and where your township, borough or city zoning allows it. Since January 1, 2026, the statewide building code has been based on the 2021 International Residential Code, but the state did not adopt the code's optional tiny house appendix, so a small house is built to the same rules as any other house unless your municipality says otherwise. We found no category in state law for a tiny home on wheels, and local zoning decides where you can live in one. A bill that would make one ADU per lot a permitted use in every municipality with zoning passed the state House in June 2026 and is waiting in the Senate. Pennsylvania has the 25th lowest cost of living of the 50 states, a flat 3.07 percent income tax, an effective property tax rate of 1.26 percent (12th highest), and homeowners insurance averaging $1,720 a year.

On this page. Quick facts, the rules in plain words, where to start, living in Pennsylvania, communities and common questions.

In Pennsylvania, the state sets the building code and each municipality (a city, borough or township) decides zoning. A tiny home on a permanent foundation, meaning it is anchored to a base built into the ground, like a concrete slab or piers, is a house under the Uniform Construction Code. A tiny home on wheels is built on a trailer so it can be towed. We found no state housing category that covers one, so whether you can live in one comes down to local zoning.

This guide covers the state code and the tiny house appendix, who inspects your home, homes on wheels, manufactured and modular homes, ADUs, septic, wells and radon, and where to find a community.

Quick facts

On a foundation (anchored to a base in the ground): a house under the Pennsylvania Uniform Construction Code.
Building code in force: the 2021 International Residential Code with Pennsylvania changes, effective January 1, 2026.
Tiny house appendix: not adopted by the state. A municipality may list it in its own code, so ask yours.
Who inspects: over 90 percent of Pennsylvania's 2,562 municipalities enforce the code locally. In the rest, a state-certified third-party agency that you hire inspects homes.
On wheels (built on a trailer): we found no category of its own in state law. Local zoning decides.
ADUs (a second, smaller home on the same lot as a house): no statewide law yet. HB 2186 passed the House in June 2026 and is in a Senate committee. Pittsburgh allows up to two ADUs per lot under rules in effect since October 29, 2026.
Septic (an underground system that treats wastewater where there is no public sewer): permitted by your local agency's Sewage Enforcement Officer before anything is installed.

Can you live in a tiny home full time in Pennsylvania?

Yes, on a permanent foundation where local zoning allows it. On wheels, it depends on your municipality.

On a foundation, a tiny home is a house. It has to meet the state code, and it needs public sewer or a permitted septic system.
On wheels, we found no state law that allows or bans living full time in one. Your municipality's zoning decides.
We found no statewide minimum house size. Your municipality may set one, so ask before you buy.

The rules in plain words

Building code

Pennsylvania's statewide code is the Uniform Construction Code (UCC), run by the Department of Labor and Industry. For homes, the UCC adopts the 2021 International Residential Code with Pennsylvania's changes. That update took effect January 1, 2026, replacing the 2018 code that had been in force since February 14, 2022.

A few of Pennsylvania's changes matter for small homes.

Stairs need risers no taller than 8 1/4 inches and treads at least 9 inches deep, and a stairway must be at least 3 feet wide with 6 feet 8 inches of headroom along the whole run.
A shipping container used as a home must be certified free of contaminants before permitting, by a qualified third-party inspector your local code official approves, and any openings cut beyond what the commercial building code allows must be certified by a Pennsylvania registered design professional.

The tiny house appendix

The national residential code has an optional appendix with rules for tiny houses of 400 square feet or less. It was called Appendix Q in the 2018 code and is Appendix AQ in the 2021 code. It allows lower ceilings in lofts and simpler loft stairs and ladders. Whether it applies in Pennsylvania is not settled for every town, and four things point different ways.

The state rule that adopts the 2021 code, 34 Pa. Code § 403.21, says appendices to the codes it lists "are not adopted," apart from a few that are not part of the residential code, so the state did not adopt the tiny house appendix.
The code itself says the appendix is "not mandatory unless specifically referenced in the adopting ordinance."
The state law behind the code, the Pennsylvania Construction Code Act, says no municipality may enact an ordinance "which is less than the minimum requirement" of the code. The code's publisher says the appendix "relaxes various requirements" for houses of 400 square feet or less, and we found no court or state ruling on whether a local adoption counts as less.
A municipality can list appendices in its own building code ordinance, but the wording may be old. Springfield Township in Montgomery County lists Appendix Q among the residential appendices it adopts, in a section last amended in January 2015, when Appendix Q of the residential code was still a reserved, empty slot. The same section also adopts the matching appendices of later codes, so whether it reaches today's tiny house appendix is for the township to say. The Department of Labor and Industry's published list of local code change ordinances, which it checks against the minimum rule, does not list Springfield Township or any tiny house appendix.

The sources lean toward this. Unless your municipality has adopted the appendix and confirms it still applies under the 2026 code, plan to build your tiny house to the full residential code, including Pennsylvania's 3 foot stair rule. That affects loft design and cost, so ask your municipality's building code official in writing before you buy plans. If you would rather skip the loft, see tiny home layouts without a loft.

Who inspects your home

Each municipality chooses whether to enforce the UCC itself. Over 90 percent of Pennsylvania's 2,562 municipalities enforce it locally, with their own staff or a certified third-party agency they hire. In a municipality that opted out, a third-party agency certified by the state, hired by the owner or the contractor, enforces the residential code. Ask your municipality which applies before you apply for a permit.

Minimum house size

We found no statewide minimum house size and no state law that limits local minimums. Your municipality's zoning decides.

Tiny homes on wheels

We found no category of its own for a tiny home on wheels in Pennsylvania law, and no state law that allows or bans living full time in one. Three points shape your options.

Zoning is local. The state planning law says zoning ordinances should provide for "all basic forms of housing," including mobile homes and mobile home parks, but it does not name tiny homes, and it says a zoning ordinance is not invalid for leaving out "any other specific dwelling type."
The ADU bill now in the Senate (HB 2186) would not cover them. Its definition says an ADU "does not include a recreational vehicle."
Titling runs through PennDOT. Its specially constructed vehicle fact sheet (February 2025) lists homemade trailers among the vehicles that need a specially constructed title, and each one needs an enhanced safety inspection at an approved station first. Whether PennDOT treats a homemade tiny home on wheels as a homemade trailer is a question for PennDOT before you build.

A park model or a certified tiny home on wheels is easier to place in a community. Tiny Estates, for example, requires a VIN and says certification is welcome but not required. Get your municipality's answer in writing before you buy a home on wheels or land to park it on. See are tiny homes legal for how local zoning works.

Modular and manufactured homes

The Department of Community and Economic Development (DCED) enforces the federal HUD code for manufactured homes in Pennsylvania. Every manufactured home installation must be certified by an installer with a HUD manufactured home installer license, and a qualified inspector verifies new installations.

Modular homes are certified under Pennsylvania's industrialized housing rules (12 Pa. Code Chapter 145). Each module carries a Pennsylvania insignia of certification, placed in the cabinet under the kitchen sink when there is one. In Philadelphia, for example, a permit application needs plans approved by a third-party agency certified by DCED, and the city still permits the foundation, site work and utility connections. Ask your municipality what it permits for a modular home.

ADU rules

Pennsylvania has no statewide ADU law. HB 2186 passed the state House 139 to 62 on June 1, 2026 and was sent to the Senate Urban Affairs and Housing Committee on June 5, 2026. As passed by the House, it would:

make one ADU per lot a permitted use in every municipality with zoning where a house is allowed, without overriding deed restrictions or community association documents,
bar municipalities from setting a minimum ADU size above 200 square feet, or a maximum below half the size of the house or 850 square feet, whichever is less (or the whole floor of a basement or attic),
bar owner occupancy rules and extra parking requirements,
let municipalities ban rentals shorter than 30 days.

It is not law unless the Senate passes it and the Governor signs it. Until then, your municipality decides.

Cities set their own rules today.

Philadelphia's zoning code allows no more than one ADU per lot, and only on a lot with one single-family home, in a historic building or in a detached or semi-detached house on a lot of at least 1,600 square feet in the RSA-5 or CMX-1 zoning district. An ADU there can be up to 800 square feet (more inside historic buildings), and the owner must live in the house or the ADU. The ADU must be inside the main building or inside an accessory building, such as a detached garage, that already existed when the zoning code took effect, so a new backyard cottage is not an ADU there. A 2025 City Council bill (Bill 250042) that would remove the 800 square foot cap and some of the district limits is still in committee.
Pittsburgh's zoning bill (Bill 2025-1545) passed City Council on October 27, 2026 and was signed by the Mayor on October 29, 2026, the effective date in the city's legislative record. The enacted text allows up to two ADUs on a lot whose main use is a home, each up to 1,000 square feet and 30 feet tall, inside the house, in a detached building or in an existing accessory building. It drops the old rules that the owner live on site and that a lot have only one ADU. The city's online zoning code may take time to show the change, so confirm the current rules with the city before you plan around them.

For one owner's experience, see a backyard tiny home.

Septic

Pennsylvania's Sewage Facilities Act (Act 537) governs septic systems. Your local agency's Sewage Enforcement Officer does the soil profile and percolation testing and approves or denies the permit, and you need the permit before the system is installed. Sewage Enforcement Officers work for the local agency, not the Department of Environmental Protection, which oversees the program.

Wells and radon

Pennsylvania has no statewide construction standards for private water wells, other than a few county or local ordinances, according to Penn State Extension. Drillers must complete a well log for every well. Ask your driller how the well will be built and tested.
The Department of Environmental Protection says about 40 percent of Pennsylvania homes have radon above the EPA action level of 4.0 pCi/L. Test kits generally cost $20 to $30.

Where to start

Not sure which office covers your land? USA.gov's local government finder points to a directory of Pennsylvania's counties and cities, with their websites and contacts.
Call the zoning officer for your municipality (the city, borough or township, not the county). Ask whether tiny homes and ADUs are allowed, whether there is a minimum house size, and whether a tiny home on wheels can be lived in there. Get the answer in writing.
Ask who enforces the building code there, local staff, a third-party agency the municipality hired, or, in an opt-out municipality, a certified agency you hire. Ask whether the municipality has adopted the tiny house appendix.
If the land is not on public sewer, contact the local agency's Sewage Enforcement Officer for soil testing and a septic permit before you buy.
For a well, ask the driller how it will be built and tested, and test the water.
Test for radon, especially before you finish a basement or crawl space.
For a manufactured home, use a licensed HUD installer. For a modular home, look for the Pennsylvania insignia.
For a tiny home on wheels, ask PennDOT how it will be titled before you build or buy.
Before buying land, check deed restrictions and any community association rules.

From people who work in Pennsylvania

Look at the site itself, not just the house. In Pennsylvania, the land grade can make a major difference, so it is important to know whether you can realistically create a zero-step path from where you park all the way into the home. A great accessible floor plan can still be limited by a steep driveway, uneven terrain, or steps at the entrance.

The biggest mistake is focusing on individual accessible features instead of how someone will actually live in and use the space. In a small home, every inch matters. A wider doorway or walk-in shower is helpful, but the layout also needs to support a person's routines, habits, and preferences for completing everyday activities. Accessibility should start with understanding the individual and designing the home around how they move through and use it every day.

Tiffany McDeavitt, OTD, OTR/L, CAPS, Founder, Accessible Housing Solutions

Living in Pennsylvania

How Pennsylvania compares with the other 49 states on the things people weigh before a move. Figures as of November 2026.

Happiness score (WalletHub 2026). 52.42 out of 100, 25th happiest
Cost of living (MERIC, Q2 2026; U.S. average is 100). 95.3, 25th lowest
State income tax. Flat 3.07 percent
Property tax, effective rate on owner-occupied homes (Tax Foundation, 2024 data). 1.26 percent, 12th highest
Homeowners insurance, average a year with $400,000 in dwelling coverage (NerdWallet 2026; U.S. average $2,490). $1,720
Health care (U.S. News 2026). 11th
Education (U.S. News 2026). 35th
Average temperature, 1991 to 2020. 49.5 degrees F
Average precipitation, 1991 to 2020. 45.03 inches a year
Sunshine in Harrisburg. 58 percent of possible sunshine, 87 clear days a year
People 65 and older (2024). 20.4 percent
State parks. 125 state parks and 2.2 million acres of state forest

Pennsylvania's cost of living is a little below the national average, and the state income tax is a flat 3.07 percent, though some local governments add their own income tax. The effective property tax rate is 1.26 percent. Homeowners insurance averages $1,720 a year with $400,000 in dwelling coverage, compared with a U.S. average of $2,490. U.S. News ranks Pennsylvania 11th in health care and 35th in education, and WalletHub ranks it 25th happiest.

Rankings mix many factors, and statewide averages hide big differences between regions. Philadelphia and its suburbs, Lancaster County, the central mountains, the Poconos and western Pennsylvania differ in weather, land prices and local rules, so look at the area where you plan to live.

Tiny home communities in Pennsylvania

We found few Pennsylvania tiny home communities that publish their details online, and several directory listings could not be traced to a current operator website. Rules, prices and openings change, so contact each one directly before you plan around it.

Tiny Estates, Elizabethtown, Lancaster County. A gated community, established in 2018, where owners bring their own tiny home on wheels and lease a lot. Homes need a VIN and are generally 24 to 40 feet long and 8.5 to 10 feet wide, and it does not accept mobile homes or homes on foundations. Lot rent includes water, sewer, propane, internet, trash, mowing and plowing. Its website says lots usually open when a resident gives notice, and it keeps an interest list. It also offers nightly and long-term rentals. Learn more about lot rent.

Ask about year-round living, availability and current prices.

Tours we have filmed in Pennsylvania

We do not have a Pennsylvania tour to list here yet. When we do, it will be listed here. Our tours from other states are at Tiny Home Tours by State.

Get new tours and guides

Every other Friday we send real tours, results from our audience polls, and parking and legal lessons from people living tiny. Join the Tiny Home Tours newsletter.

Frequently asked questions

Is it legal to live in a tiny house in Pennsylvania?

Yes, on a permanent foundation, if it meets the state building code and your municipality's zoning, with public sewer or a permitted septic system. For a tiny home on wheels, local zoning decides.

Does Pennsylvania use Appendix Q for tiny houses?

Not statewide. The state code adopts the 2021 International Residential Code but none of its appendices, including the tiny house appendix (Appendix AQ in the 2021 code). A municipality may list it in its own code, but state law bars local rules that fall below the code's minimum and the appendix relaxes some rules, so whether a local adoption holds is not settled. Ask your municipality's building code official in writing whether it applies to you.

Can I build an ADU in Pennsylvania?

It depends on your municipality. Pennsylvania has no statewide ADU law yet. HB 2186, which would allow one ADU per lot in every municipality with zoning, passed the House in June 2026 and is in a Senate committee. Philadelphia allows no more than one ADU per lot on qualifying properties, inside a house or an existing accessory building, up to 800 square feet, with the owner living on the property. Pittsburgh allows up to two ADUs on a lot with a home, each up to 1,000 square feet, with no owner occupancy rule, under a law signed and in effect on October 29, 2026.

Can I park a tiny home on wheels on my own land in Pennsylvania?

Only if your municipality's zoning allows it. We found no category for tiny homes on wheels in Pennsylvania law, and no state law that allows or bans living full time in one. Get the answer in writing from your zoning officer.

Do I need a septic permit for a tiny home in Pennsylvania?

Yes, if the land is not on public sewer. Your local agency's Sewage Enforcement Officer tests the soil and issues the permit, and you need it before the system is installed.

Sources

This page explains the rules in general terms and is not legal advice. Local rules vary. Confirm with your municipality before you buy land or a home.

Hero photo: Ricketts Glen State Park, by Jeb Buchman on Unsplash.