Hard Costs, Soft Costs and Contingency: How a Construction Budget Is Built
Most early budgets that fail in Ontario do not fail on the building. They fail on everything around it: fees, approvals, development charges, and the allowance for what is not yet designed. This page explains the three layers of a commercial construction budget and the ratios to expect at feasibility stage.
Planning guidance for owners, developers, and facility teams. Not a quotation or a basis for financing.
Run the Cost Calculator Read How Estimates WorkA construction budget has three layers, and they behave differently as a project matures
Early budgets usually get the first layer roughly right and the other two wrong. Keeping them separate is the single most useful habit at feasibility stage.
Hard costs
What the contractor builds: structure, envelope, interiors, mechanical and electrical systems, and site work. The largest layer, and the one most people picture when they ask "what does it cost per square foot".
Soft costs
Everything required to get the building designed, approved, financed and handed over, but not physically built into it: consultant fees, permits, development charges, legal, owner-side and carrying costs.
Contingency
The explicit allowance for cost that is expected to exist but cannot yet be itemized. Two kinds at feasibility stage: design contingency and construction contingency, carried separately.
What sits inside each layer, and the Q4 2025 ratios to expect
Each step below adds to the one before it. Together they explain why a total project cost in Ontario is commonly 1.35 to 1.55 times the hard-cost figure before land and financing.
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Hard costs: what is inside the per-square-foot number
When a cost guide quotes a hard-cost range, for example C$115–175 per sq ft for a GTA warehouse shell, it normally includes the following.
Substructure and structure
Foundations, slab-on-grade, steel or precast frame, roof deck.
Envelope
Wall systems, roofing, glazing, doors, loading docks.
Interiors
Partitions, finishes, washrooms, and base-building office area where stated.
Mechanical and electrical
HVAC, plumbing, fire protection, lighting, power distribution, and the base electrical service.
Site work
Grading, paving, storm and sanitary servicing on site, landscaping, and site lighting.
General conditions and fee
Site supervision, temporary works, insurance, bonding, overhead and profit.
Usually not inside the number: process and material-handling equipment, racking, tenant-specific fit-out beyond the stated scope, off-site servicing upgrades, land, and HST. Each cost guide on this site lists its own inclusions and exclusions. Read that box before comparing one range to another. Hard costs move with scope, specification, site conditions and market timing. They do not move with the owner's approval process. That is the soft-cost layer. - 2
Soft costs: the layer that is easiest to under-budget
Soft costs sit between a site and an occupied building. On Ontario commercial and industrial projects at Q4 2025 benchmarks, a typical soft-cost overlay is 18–28% of hard cost, before land and financing. The spread comes from four groups.
1. Design and engineering fees
Architecture, structural, mechanical, electrical, civil, and specialty consultants (fire protection, geotechnical, environmental, traffic, landscape). Full design fees commonly run 5.5–12% of hard cost; a straightforward industrial building sits toward the low end, while healthcare or food-grade facilities climb because the consultant team is larger and review cycles are longer.
2. Municipal and regulatory charges
Building permit fees, site plan application fees, development charges, parkland dedication or cash-in-lieu, education development charges, and utility connection charges. Development charges are set by municipal by-law under the Development Charges Act, 1997, levied by the local municipality and, in two-tier regions such as Peel, York, Halton and Durham, by the regional municipality as well, and calculated per square foot of gross floor area for non-residential buildings.
3. Owner-side costs
Legal, surveying, project management or owner's representative (commonly 1–2.5% of hard cost), commissioning, moving, furniture and equipment, builder's risk insurance where the owner carries it (1–1.5%, higher on recent Q4 2025 broker quotes), and marketing where relevant.
4. Carrying costs
Interest during construction, property tax on the land during the build, and temporary facilities. Usually shown separately from the soft-cost percentage because they depend on the owner's financing structure, not on the building.
Development charges are the item that most often breaks a feasibility budget. Rates, exemptions and payment timing vary materially between neighbouring municipalities: at Q4 2025 by-law rates the industrial charge alone ranges from roughly C$20 to C$35 per sq ft across the GTA and nearby markets, and the commercial charge from roughly C$22 to C$62. The same building can carry a six-figure difference in charges depending on which side of a municipal boundary it sits. A budget that applies a flat 10% for "soft costs" on an Ontario project is almost always short; use the four groups above as a checklist and take the development-charge figure from the municipality's current rate schedule, not from a rule of thumb. - 3
Contingency: two kinds, two purposes
Contingency is not padding. It is the explicit allowance for cost that the estimate class cannot yet resolve. At feasibility stage there are two kinds, and they should be carried separately.
Design contingency
About 10–15% of hard cost at Class D
Covers scope that will be added as drawings develop: a mezzanine stair that was not on the concept sketch, the electrical service upgrade discovered during utility coordination, the storm-water control the municipality asks for at site plan. It shrinks as the design matures and should be close to zero at tender.
Construction contingency
About 5–10% for new builds
Covers unknowns during the build: unforeseen soil conditions, latent conditions in existing buildings, weather, and owner-directed changes. Retrofits of occupied or older buildings often warrant more because the existing conditions are less certain.
Two practical rules. Carry contingency as a line item, not hidden inside unit rates: a reviewer who cannot see the contingency cannot judge whether the budget is conservative or thin. And tie each contingency to a release condition: design contingency releases as drawings are issued, construction contingency as risk items close out. A contingency that never releases is an inflated budget; one that is spent in the first month is an under-scoped one. The calculator carries contingency explicitly for this reason, and the methodology page explains how the allowance is set for each project type. Which party carries construction contingency also depends on the contract model. - 4
Putting the layers together
A simplified Class D build-up for an Ontario commercial project, Q4 2025 basis.
Layer Typical ratio Note Hard cost 100% (base) From the relevant cost guide range, adjusted for site and specification Soft costs (design, municipal, owner) +18–28% Development charges from the municipal rate schedule, not a percentage Design contingency +10–15% of hard cost Releases as design matures Construction contingency +5–10% of hard cost Releases as risk closes out Carrying costs, land, HST Shown separately Depend on financing and ownership structure Result: a total project cost that is commonly 1.35 to 1.55 times the hard-cost figure before land and financing. Owners who budget only the hard cost are, in effect, planning for about two-thirds of the project. - 5
Where early budgets go wrong
Across the projects we review, the same five gaps appear.
1. Development charges assumed, not looked up
The single largest soft-cost error on GTA industrial projects.
2. Off-site servicing treated as the municipality's problem
Watermain, sanitary or road upgrades conditioned in site plan approval are owner costs.
3. Contingency carried once, as one percentage
With no split between design and construction contingency and no release plan.
4. Fit-out and equipment left out
Because the cost guide range excluded them, and nobody added them back.
5. HST and carrying cost omitted
From the number given to the lender or the board.
None of these is a construction problem. All of them are budget-structure problems that an engineering-informed pre-construction review catches early. Utility capacity, structural reuse, change of occupancy and site servicing are budget items that only an engineering review can size.
Hard costs, soft costs and contingency FAQ
What is the difference between hard costs and soft costs in construction?
Hard costs are the physical construction of the building and site, including structure, envelope, interiors, mechanical and electrical systems, site work, and the contractor's general conditions and fee. Soft costs are the fees and charges needed to design, approve, finance and hand over the building, such as consultant fees, permits, development charges, legal and owner-side costs.
What percentage should soft costs be in an Ontario commercial construction budget?
At Q4 2025 benchmarks, a typical soft-cost overlay on Ontario commercial and industrial projects is 18–28% of hard cost before land and financing. The range depends mainly on the consultant team required and on municipal development charges, which vary materially between municipalities and should be taken from the current rate schedule.
How much contingency should a construction budget carry?
At feasibility (Class D) stage, carry a design contingency of about 10–15% of hard cost for scope that will emerge as drawings develop, plus a construction contingency of about 5–10% for unknowns during the build. Carry them as separate line items and tie each to a release condition rather than hiding them inside unit rates.
Where these ratios come from
The ratios on this page are the same planning values the ProWise cost calculator applies, assembled from published Canadian cost references, Ontario municipal and regulatory inputs, and our own recent project pricing, indexed to the Q4 2025 basis quarter. They are planning benchmarks, not a quotation.
Published cost references
Altus Group Canadian Cost Guide (Ontario and GTA unit-rate bands by building type); RSMeans / Gordian construction cost data with Toronto and regional Ontario city cost indexes; Infrastructure Ontario project database (public-sector project cost records across building types); Statistics Canada Building Construction Price Index (Toronto CMA, non-residential) for indexing published figures to the basis quarter.
Municipal and regulatory inputs
Development charge by-laws and rate schedules of GTA lower- and upper-tier municipalities (including Toronto, Peel, York, Halton, and Durham) and of secondary Ontario markets; municipal building permit fee schedules; Ontario Building Code classification thresholds that change design-fee and compliance scope.
Project experience
Recent ProWise Construction tender pricing and ProWise Engineering design and permit work across industrial, commercial, restaurant, and institutional projects in the GTA. We use this to sanity-check published fee and contingency bands against actual project outcomes, not to replace them.
Build the budget with all three layers visible.
Run the calculator for a Class D range with soft costs and contingency carried explicitly. If the project is large, permit-sensitive, or in an unfamiliar municipality, request a detailed estimate inquiry.
Run the Cost Calculator Request a Detailed EstimateClass D conceptual estimate information only, per AACE International Recommended Practice 18R-97. Ratios are typical Q4 2025 planning values for Ontario commercial and industrial projects and are not a quotation, a financing basis or a contract value. Development charge and permit fee figures must be taken from the current municipal by-law and fee schedule. Material decisions require qualified engineering and quantity-surveying review.