Which renovations actually add value to a Toronto home?

Legal, permitted space is what holds value, and unpermitted work can be ordered removed. Ontario rebates reach $7,500 on a cold climate heat pump.

The renovations that hold their value in Toronto are the ones that add legal, permitted, usable space, or replace a system the next owner would otherwise have to replace themselves. The ones that lose value are the ones done without a permit, because the City can order the work removed and nothing on paper supports it when you sell.

The rest of this is how to tell the two apart, what each one costs you in property tax afterwards, and what the province and Ottawa will pay you back.

What actually adds value in a Toronto home?

Space somebody can legally live in, and systems nobody has to touch for a decade.

A basement that is a legal second dwelling unit is worth more than a basement that is a large rec room, because one produces rent and the other produces carpet. Toronto allows a secondary suite in an existing detached house, semi detached house or townhouse, and creating one takes a building permit for the interior alteration. The drawings have to show the specifications of every floor, wall and roof assembly, the floor to floor and floor to ceiling heights, the stairs, landings, guards and handrails, and the location of smoke alarms and carbon monoxide detectors, according to the City of Toronto secondary suite permit guide.

That list is the whole difference between an apartment and a basement with a stove in it. It is also why the work is worth doing properly. The permit is the only thing that lets the space be described as a legal unit afterwards.

The same logic runs through the rest of the house. An addition adds floor area. A heat pump replaces a furnace and an air conditioner in one move. Insulation and air sealing change what the house costs to run every month for as long as it stands. None of that is fashion, so none of it goes out of fashion.

If the question underneath yours is how much you are allowed to build at all, we wrote about the free city tool that shows what fits on a Toronto lot.

Do you need a building permit for your renovation?

Usually yes, and for more of the job than most people expect.

A permit is required under the Building Code Act to construct or demolish a building, to build an addition, and to make a material alteration to a building or structure. The City of Toronto's own examples include:

• adding or removing walls, which is to say changing room sizes or uses
• new or enlarged windows and doors
• installing or modifying heating or plumbing systems
• finishing a basement where the work involves structural or material alterations, new plumbing or heating, or a second suite
• decks more than 60 cm above the ground, and enclosing an existing deck, porch or patio of any size
• sheds of 15 square metres or larger
• a change of use, such as one dwelling unit becoming two
• wood burning stoves and fireplaces

The same page names work that does not need one: finishing a basement where there are no structural or material alterations and no additional dwelling unit is created, and an uncovered deck less than 60 cm off the ground.

Read the two lists together and the pattern is clear. The permit follows anything structural, anything mechanical, and anything that changes how the house is used. Those are the three things a buyer's inspector and a buyer's lawyer will ask about.

What happens if you renovate without a permit?

The City is blunt about it. "Failure to obtain building permits can result in costly construction delays, legal action and/or the removal of work already completed."

That is the risk while the work is going on. The slower risk arrives at closing. Work that was never permitted was never inspected, so there is no record that any of it meets the Building Code. A basement apartment without a permit is not a legal unit, whatever it looks like, and it cannot be presented as one. Money spent that way is a cost rather than an asset, and it is a cost that turns up again as a price reduction.

Will a renovation raise your property tax?

Yes, if it needed a permit.

Municipalities notify MPAC when they issue a building permit, and MPAC reviews what changed. Its inspectors record more than 200 variables about a home and ask about finished basements, countertops, heating systems and ceiling types. Then, in MPAC's own words, "MPAC will update your property value to reflect the work completed. We will then notify both you and your municipality. You will receive a Property Assessment Change Notice (PACN) in the mail."

The bill follows. Toronto issues a supplementary or omitted tax bill where a "property is improved due to construction, an addition, or renovation", and MPAC "has authority to assign omitted and/or supplementary assessment for the current year and two years prior". Those bills are due in two instalments no matter how many years they cover, so a renovation finished two years ago can land as one demand.

One detail catches people out. The province wide reassessment in Ontario is still postponed, and MPAC states that "Property assessments for the 2026 property tax year will continue to be based on fully phased-in January 1, 2016 current values", on its assessment cycle page. Your new addition is measured against a 2016 yardstick rather than a 2026 one. If the change notice looks wrong when it arrives, there is a process, and we have written about how to appeal a property tax assessment in Ontario.

What will the government pay you to renovate?

Three programs with published limits, and two of them point at the same work.

Ontario's Home Renovation Savings Program pays for upgrades that cut a home's energy use, whether the house runs on electricity, natural gas, oil, propane or wood. Single upgrades need no home energy assessment: up to $7,500 on a cold climate air source heat pump, up to $12,000 on a ground source heat pump, up to $10,000 on solar panels and battery storage, $1,000 to $1,250 on attic insulation and up to $200 on appliances. Bundle two or more upgrades after an assessment and the assessment itself pays back $600, insulation goes to $7,700, air sealing to $250, windows and doors to $100 per rough opening, and a heat pump water heater to $500.

The multigenerational home renovation tax credit is a refundable federal credit for building a self contained secondary unit so that a senior, or an adult eligible for the disability tax credit, can live with a qualifying relative. The Canada Revenue Agency puts it at 14.5 per cent of up to $50,000 of qualifying expenditure for each completed renovation, to a maximum of $7,250. The unit needs its own entrance, kitchen and bathroom, which is the same self contained unit the City's permit drawings have to show.

The home accessibility tax credit covers work that makes a home safer or easier to move around in for someone 65 or older, or eligible for the disability tax credit. Up to $20,000 of eligible expenses a year, non refundable, claimed on line 31285.

Look at what the two federal credits are actually buying. A legal, self contained unit, and a home somebody can stay in. That is close to what resale pays for as well.

How do you keep the value you paid for?

Keep the paperwork, and get the final inspection.

Hold on to the permit numbers, the sign off on the final inspection, the invoices, the model and serial numbers of anything mechanical, and the rebate approvals. When a buyer's lawyer asks what was done to this house, that folder is the answer. It is also the difference between a renovation that is worth something at resale and one you have to talk your way past.

The rule underneath all of it is short. Value that survives a sale is value somebody else can verify.