Define the result before choosing a spending figure
“Renovate the house” could mean repainting and replacing floors, rebuilding a kitchen and bathroom, or opening walls and renewing major systems. Start with a room-by-room brief: what stays, what changes, what must function before you move in, and what you will supply yourself. Record the address, approximate floor area, occupancy, access and starting condition.
A 1,500 sq ft house is about 139.4 m², but that floor area does not establish the quantity of cabinetry, wall preparation or plumbing. Two homes of that size can require very different work. Give every contractor the same brief and explain which inspections or selections are still outstanding. The CHBA planning guide is a useful starting point for defining the job.
Use published data for the question it actually answers
CMHC’s 2026 Mortgage Consumer Survey reports that 63% of its respondents plan renovations. Its sample contains over 4,100 people who recently completed a mortgage transaction; it is not a survey of every Canadian homeowner and does not establish your project’s price.
Statistics Canada’s second-quarter 2026 Residential Renovation Price Index tracks changes in contractor prices for defined projects across 15 metropolitan areas. Its prices exclude value-added taxes and project design. An index helps explain why a dated price needs refreshing; it is not a dollar allowance for renovating your house. For an orderable budget, you still need measured scope and current local offers.
Make every cost belong to one place
| Group | Record | Common omission |
|---|---|---|
| Investigation and design | Measured plans, specialist assessments and specifications | Assuming design is included in a construction quote |
| Contractor work | Defined operations, products, installation and disposal | Counting owner purchases again inside contractor materials |
| Permits and reviews | Actual required applications and the quoted fee basis | Using a contractor’s application service fee as the municipal fee |
| Owner costs | Temporary accommodation, storage and direct purchases | Leaving these out because they are outside the building contract |
| Remaining uncertainty | Named risks and a separate contingency | Treating an already identified repair as an unspecified risk |
For each amount, record whether it is an initial allowance, a supplier quote or an agreed price. An unselected door should have an allowance and selection deadline, not a zero. A known foundation repair needs its own investigation and estimate. Keep the contingency for uncertainty that remains after that work.
A complete worked example with clear tax boundaries
| Item | Amount |
|---|---|
| Design and defined investigations, before HST | 5,000 |
| Protection, demolition and waste, before HST | 5,500 |
| Electrical scope, before HST | 12,500 |
| Plumbing scope, before HST | 9,500 |
| Substrates and finishes, before HST | 19,000 |
| Kitchen products and installation not counted elsewhere, before HST | 25,000 |
| Bathroom products and installation not counted elsewhere, before HST | 16,500 |
| Delivery, coordination and final cleaning, before HST | 7,000 |
| Taxable contractor subtotal | 100,000 |
| Illustrative Ontario HST: 13% | 13,000 |
| Contractor total including HST | 113,000 |
| Permit/review allowance, treated as the quoted final charge | 1,500 |
| Temporary accommodation and storage, final allowance | 2,000 |
| Contingency: illustrative 10% of tax-included contractor total | 11,300 |
| Total funding for the stated example | 127,800 |
The total is $113,000 + $1,500 + $2,000 + $11,300 = $127,800. The contingency percentage is a teaching choice. It is not an official minimum, and it does not make the exclusions affordable. If you need new windows before moving in, obtain that scope and add its full cost before approving the plan.
Check taxes instead of applying one percentage to everything
The CRA rate table shows that GST/HST treatment varies by place of supply. The example uses Ontario’s 13% HST for its specified taxable contractor package. It does not prescribe the treatment of every fee, rebate, purchase or transaction, and it does not apply that rate across Canada.
Ask each supplier to show the subtotal, applicable taxes and final amount. Record whether a planning allowance already includes tax. Do not add HST a second time to a tax-included quote, and do not automatically apply it to a municipal charge. In the worked table the permit and accommodation figures are final planning allowances, with their actual tax treatment still to be confirmed when quoted.
Replace allowances, then track payments separately
Suppose flooring was allowed at $8,000 and the selected supply-and-install package is agreed at $9,400 including applicable tax. Replace the $8,000 allowance with $9,400; do not add both. If you pay $2,000 against that $9,400 agreement, its cost stays $9,400 and its arithmetic unpaid balance becomes $7,400.
An advance funds the existing agreement. It is not another category of work. Likewise, a quote received is not yet a payment, and a material delivery is not proof of completed installation. Keep the cost forecast, payment history and inspection records connected but distinct. The Office of Consumer Affairs guide explains the importance of recording scope and payment terms in the contract.
Test the funding plan against dates
- List the largest unresolved items and who must price or investigate them.
- Map deposits, deliveries and progress payments to actual cash available at each date.
- Keep anticipated rebates, financing approvals and actual funds received in separate records.
- Add the effect of a delayed prerequisite: storage, accommodation or repeat delivery.
- If the forecast exceeds the limit, change uncommitted scope before ordering products.
A spreadsheet or Reno Pro can organise stages, materials, notes and recorded payments. Keep supplier offers and the current agreed scope beside those records. Review the plan after a major selection or approved change. The useful outcome is a funding decision you can explain: what it buys, what remains unknown and what cash is needed next.
Sources and scope
- Canadian Home Builders’ Association — Before starting a renovation
- Office of Consumer Affairs — Home renovations
- Canada Revenue Agency — Charge and collect the GST/HST: which rate to charge
- Statistics Canada — Residential Renovation Price Index, second quarter 2026
- CMHC — 2026 Mortgage Consumer Survey
Sources reviewed on 18 October 2026. All amounts are Canadian dollars (CAD). Worked figures and contingency percentages are editorial teaching examples, not market averages, quotations or prescribed allowances. Ontario and Toronto rules are identified where used; check the rules and requirements for your property and jurisdiction.