HVAC permits in Halton Hills and Georgetown follow one dividing line: replacing a furnace with one of the same fuel and the same output, or adding an air conditioner to a house, does not need a Town building permit, while a change of fuel, a wood stove, an addition with new ductwork or an accessory apartment does. Gas work is regulated separately and must be done by a TSSA-registered contractor no matter what the Town requires. New electrical circuits are filed with the Electrical Safety Authority. Three bodies, three different questions.
Which HVAC Jobs Need a Town of Halton Hills Building Permit
The Town publishes a list, and it is more specific than most. These are the heating and cooling items on it as of October 2026; the Town can change the list, so confirm with Building Services before work starts.
- Permit required: a new furnace that uses a new fuel source, such as oil or propane to natural gas.
- Permit required: a solid-fuel appliance, meaning a wood stove or wood-burning fireplace.
- Permit required: heating, ventilation or air conditioning in any building other than a house, which covers shops, offices and multi-unit buildings.
- Permit required: an addition, alteration or renovation to a house, and the ductwork that comes with it.
- Permit required: creating an accessory apartment inside an existing single-unit house.
- Permit required: new plumbing, or finishing a roughed-in bathroom.
- No permit: a replacement furnace when the new and old furnaces have the same output and use the same fuel.
- No permit: air conditioning units for houses.
Two of those lines deserve a second look. The furnace exemption says same output, and a properly sized replacement is often smaller than the furnace it replaces, so we ask Building Services when the size changes. And a heat pump that takes over from a gas furnace as the main heat source is a different job from an air conditioner swap; ask before assuming it falls under the exemption.
New or Altered Duct Systems: Additions, Basements and Accessory Apartments
Ductwork needs a permit when it is part of construction that needs one. An addition, a second storey or an accessory apartment goes through the Town's building department, and the heating design is reviewed with the rest of the drawings. Expect to submit a heat-loss calculation and a duct layout for the new space with the application.
The practical question on an addition is whether the existing furnace can carry it. A furnace sized for the original house may have the capacity, but the duct trunk often cannot deliver the air to a room 12 metres away. The designer either extends and enlarges the trunk or gives the addition its own ductless or slim-duct system, and the drawings show which.
Accessory apartments are stricter. The Building Code has rules about air shared between two dwelling units, so the heating and ventilation layout for the second unit is examined closely, and the Town has its own registration process for additional residential units. Our guide to HVAC for a legal basement apartment in Ontario covers the design choices.
What the TSSA Covers: Gas Piping, Appliances and Venting
The Technical Standards and Safety Authority regulates fuels in Ontario, and its rules apply to every gas furnace, water heater, fireplace and gas line whether or not the Town wants a building permit. The contractor must be registered with the TSSA, and the technician doing the work must hold a G2 or G1 gas licence. A G3 holder works under supervision.
The installation itself is done to CSA B149.1, the natural gas and propane installation code. That covers pipe sizing, pressure testing new piping, combustion air, vent materials and where a vent may terminate. Rural Halton Hills properties on propane fall under the same code and the same licensing.
There is no gas permit for a homeowner to apply for at Town Hall. What you should have at the end of the job is the contractor's TSSA registration number on the invoice and the technician's licence number on request. Our guide on how to verify a TSSA licence shows where to look them up.
Free quotes, written pricing.
What the ESA Covers: Circuits for AC, Heat Pumps and Furnaces
The Electrical Safety Authority covers the wiring. A new circuit, a larger breaker or a new outdoor disconnect for an air conditioner or heat pump is electrical work, and the licensed electrical contractor who does it files a notification with the ESA. That filing is the electrical equivalent of a permit.
Heat pumps raise the question more often than air conditioners, because a cold-climate unit with electric backup can need more panel capacity than the house has. A service upgrade is coordinated with Halton Hills Hydro in Georgetown and Acton. Ask who is doing the electrical portion of the quote and whether the ESA notification is included in the price.
Older Georgetown Homes: From Chimney Venting to a Sidewall, and Where the Vent Can Go
Every new gas furnace sold today is a condensing unit at 95% AFUE or better, and it vents through the wall in plastic pipe, not up the chimney. In the older parts of Georgetown, the pre-war brick houses near the downtown and the 1950s and 1960s bungalows around them, that means choosing a wall for two new pipes. The gas code and the furnace manual together set where the termination is allowed.
- A minimum height above grade, and above the snow line the manufacturer expects.
- A minimum distance from any window or door that opens, which grows with the size of the appliance.
- A larger distance from a mechanical air intake, such as the fresh-air hood of an HRV.
- Clear of the vent on the gas meter's regulator.
- Limits on terminating above a walkway or driveway shared between two houses, and under a deck or porch.
- The exact distances are in the furnace's installation manual and the current gas code, and the installer checks both before the wall is chosen.
On a narrow lot with the gas meter, a basement window and a side door all on the same wall, those clearances can rule out the obvious spot. The fix is a longer vent run to the rear wall, within the length the manufacturer allows, or a concentric termination that takes one opening where two would otherwise be needed. When the manual asks for more clearance than the code, the manual wins.
The chimney does not retire quietly. A gas water heater left venting into it alone may need a liner sized for that one appliance, or a change to a power-vented tank. We inspect the flue and price whichever applies in the furnace quote.
Renting a Furnace in Halton Hills Does Not Change the Rules
A rental company's installation needs the same TSSA-licensed technician, the same vent clearances and the same Town permit for a fuel change. What changes is who owns the equipment and what is registered against your property. A purchased high-efficiency furnace runs $4,500–$7,500 installed; compare that figure against the total of the rental payments over the contract term before signing.
Verdict: A Quick Check for Your Job
- Gas furnace for gas furnace, same size, same spot: no Town permit; TSSA-licensed installer; vent clearances checked.
- Oil or propane furnace to natural gas: Town permit, plus TSSA-licensed gas work and a new gas line.
- Adding central air or replacing an air conditioner at a house: no Town permit; ESA notification if the circuit is new or changed.
- Heat pump replacing the furnace as the main heat source: call Building Services first; ESA notification for the circuit.
- Addition, second storey or accessory apartment: building permit with heat-loss and duct design.
- Wood stove or wood fireplace: building permit.
We confirm the permit question in writing at the quote, do the gas work with our own TSSA-licensed technicians and name the electrician on the paperwork. Halton Hills' neighbour to the south has a different list, set out in our guide to HVAC permits in Milton. See what our furnace installation includes, read about our work in Georgetown, or send us the job details and we will tell you which approvals apply.
Frequently asked questions
Do I need a permit to replace my furnace in Georgetown?
Not for a like-for-like replacement. The Town of Halton Hills exempts a replacement furnace when the new and old furnaces have the same output and use the same fuel. A change of fuel, such as oil to natural gas, does need a building permit. Either way the installer must be a TSSA-registered contractor with licensed gas technicians.
Does the Town inspect a furnace installation?
Only when the work is under a building permit, such as a fuel change or an addition. A straight replacement has no Town inspection. The safeguard on those jobs is the installer's TSSA licence and the gas code, so ask for the technician's licence number and keep the invoice showing the contractor's TSSA registration.
Do I need a permit to install a heat pump in Halton Hills?
An air conditioner for a house is on the Town's no-permit list, and a heat pump added beside an existing furnace is the same outdoor equipment. Where the heat pump replaces the furnace as the main heat source, ask Building Services, because a new fuel source for heating is a permit item. A new electrical circuit needs an ESA notification in both cases.
Who is responsible for getting the permit, me or the contractor?
The property owner is responsible for making sure a required permit exists, and either the owner or an authorized agent can apply. In practice the contractor or designer prepares the heat-loss and duct drawings and often submits them. Get it in writing in the quote: who applies, who pays the Town's fee, and who books the inspections.