Ontario's Plain-English Guide to Custom Home Building📞 705-533-1633 | ☎️ 1-866-868-6606 | ✉️ info@icfhome.ca
Calculators
Ontario-specific
Fast answers
Builder-grade math
Ontario Construction Calculators
Pick a calculator below and get a quick, practical answer without drowning in spreadsheets. These tools are built for Ontario homeowners and builders who want real numbers, not vague guesses.
Planning and budgeting a new house
The whole-house numbers: what it costs to build, the permits, development charges and HST rebates, the financing draws, and the concrete.
Custom Home Building Calculator
A fast budget range to sanity-check your build before you fall in love with the expensive plan.
Heat Loss Calculator (Ontario 2026)
Right-size your heating system for a high-performance home. Bigger is not better.
New Home HST Rebate Calculator (Ontario)
Estimate your potential HST rebate for a new build or substantial renovation.
GST Rebate Calculator (First-Time Home Buyers)
Quickly check your GST rebate estimate if you are eligible as a first-time buyer in Ontario.
Renovation vs Rebuild Calculator
Compare whether it makes more sense to renovate what you have or tear down and build new.
Ontario Building Permit Cost Calculator
Get a rough permit cost estimate for your Ontario project before the paperwork starts piling up.
Ontario Development Charges Calculator
Check development charge estimates so the surprise does not hit after you already love the lot.
Land Transfer Tax Ontario Rebate Guide
See land transfer tax numbers, rebate details, and what Ontario buyers should budget for at closing.
Ontario Construction Mortgage Draw Schedule
Understand typical construction loan draw stages so your financing matches how the build actually unfolds.
Waterfront Cottage Build Cost Calculator
Estimate waterfront cottage build costs with the extra reality checks these lots usually bring.
ICF Cost Calculator
Estimate ICF wall costs and compare to conventional approaches without guessing.
ICF Energy Savings Calculator Ontario
Estimate how much energy an ICF home may save compared with more conventional wall systems.
Concrete Footings Cost Calculator
Rough cost ranges for footings based on size, depth, and typical Ontario pricing inputs.
Concrete Calculator
Calculate concrete volume for slabs, pads, and pours so you do not order almost enough.
Deck Building Calculator
Estimate deck materials and quantities so your shopping list is not a creative writing exercise.
Stair Stringer Calculator
Quick rise and run math so your stairs do not feel like a fitness test.
Trade calculators
One trade at a time, in the order a house goes together. Each trade guide in the Trade Guides menu has these at the top, with its $99 quote review.
Framing and building systems
Building System Cost Comparison (Ontario 2026)
The same house as wood frame, SIP, ICF, log, timber frame and modular, every one priced as a finished house, with the sources beside each line.
House Framing Cost Calculator
Labour only or labour and materials by floor area, the per-footprint trap, the roof truss package and the crane to set it.
Kit to Finished House Calculator
A SIP, log, timber frame or modular package price in, the finished-house range and everything the package leaves out.
Wall Removal and Beam Cost Calculator
Opening a load-bearing wall line by line: engineer, permit, shoring, beam, posts, footings, services and patching.
Roofing
Roof Replacement Cost Calculator (Ontario 2026)
Footprint and pitch to squares, then shingles, metal or membrane at Ontario installed rates, with tear-off, decking, flashing, vents and HST.
Metal Roof Cost Calculator
Standing seam, metal shingles or panels, snow guards, and the 40-year cost against shingles done twice.
Roofing Material Calculator
Estimate shingles and roofing materials with fewer forgot-the-starter-strip moments.
Windows and doors
Window Replacement Cost Calculator (Ontario 2026)
Build a window schedule by type and size, pick retrofit or full-frame, frame material and glass, and get a priced estimate with per-opening ranges.
Exterior Door Cost Calculator (Ontario 2026)
Entry systems, sidelights, patio and garden doors with hardware, finish and install conditions priced the way Ontario door installers quote them.
Exterior finishes
Exterior Cladding Cost Calculator (Ontario 2026)
Every wall with its gable and openings; vinyl, fibre cement, wood, metal, stucco, stone and brick in any mix, on wood frame or ICF, with tearoff, sheathing, house wrap, strapping, insulation, flashing, trim, scaffolding, stucco details and HST.
Soffit, Fascia and Eavestrough Calculator (Ontario 2026)
Soffit by eave length and depth, fascia cover or new board, the rotten feet, 5 or 6 in. seamless trough, downspouts, guards and removal, with a check that the soffit vents the attic and the trough can carry the roof.
Insulation and air sealing
Attic Insulation Cost Calculator (Ontario 2026)
Existing depth to existing R-value, the blown top-up to R-50 or R-60 priced by the R-point, air sealing, pot light covers, hatch, baffles and removal, with HST and a check of which rebate tier the attic falls in.
Spray Foam Cost Calculator (Ontario 2026)
Surface by surface at the thickness you need, closed or open cell by the board foot, rim joists by the foot, masking, backing, the thermal barrier and the minimum charge, with the R-value each thickness gives.
Wall Assembly Comparison Calculator (Ontario 2026)
The same house seven ways, 2×6 batts to ICF: installed insulation cost, effective R-value with the studs counted, heat lost through the walls in your fuel, and the 20-year total.
Heating, cooling and ventilation
Heat Pump vs Gas Cost Calculator (Ontario 2026)
Your fuel, your bills and your hydro rate against a cold-climate heat pump: yearly heating cost both ways, the break-even COP, dual fuel or all-electric, and fifteen years with the equipment in.
HVAC System Cost Comparison Calculator (Ontario 2026)
The same house five ways, gas furnace and AC to an air-to-water heat pump with radiant floors, each priced whole with ducts or tubing, HRV and water heater, plus fifteen years of energy.
Tankless and Combi Sizing Calculator (Ontario 2026)
Incoming water temperature and the fixtures running at once, turned into the flow and BTU/h you need in January, and what 120,000 to 199,000 BTU units really deliver.
Electrical and plumbing
Whole-House Electrical Cost Calculator (Ontario 2026)
Wiring a new house or rewiring an old one, with the service, extra pot lights, EV circuit, generator, subpanels and Cat6 each priced once, in October 2026 prices.
Electrical Service Capacity Calculator (Rule 8-200)
Will a heat pump, EV charger, induction range or hot tub fit on your 100 or 200 A service? The code load calculation, step by step, and what a load manager changes.
EV Charger Cost Calculator (Ontario 2026)
A Level 2 charger installed at your house by distance and panel, with or without a load manager, and what charging costs a year on overnight rates against gasoline.
Generator and Battery Sizing Calculator (Ontario)
The well pump, sump, furnace and fridge in an outage: running watts, the starting surge, the generator size, battery hours and the installed cost.
Rural Water System Cost Calculator (Ontario 2026)
A drilled well by depth with the driller minimum, the pump and tank, the line to the house and the treatment, on one sheet with a low, middle and high total.
Well Water Treatment Selector
Enter your bacteria result and lab numbers; get each one against the Health Canada guideline and the treatment in the right order, with installed and yearly costs.
Water Heater Rent vs Buy Calculator
Your monthly rental against buying a tank, heat pump or tankless over the years you will stay, with the removal fee or buyout and the month buying pulls ahead.
Electrical Load & Wire Size Calculator
Plan electrical loads and wire sizing so just add a hot tub does not become a panel upgrade.
Plumbing Cost Calculator (Ontario)
Estimate plumbing costs for your project using Ontario-friendly assumptions and ranges.
Drywall and painting
Interior Finishing Calculator (Ontario 2026)
Drywall, taping and painting for a whole new house or addition in one number, room by room, at builder, mid and premium grade.
Drywall Installation Cost Calculator (Ontario 2026)
Board, hanging and finishing by square foot of wall and ceiling, with Level 3 to Level 5, moisture-resistant and Type X garage board priced the way Ontario boarders quote.
Drywall Taping Cost Calculator (Ontario 2026)
Taping and mudding only, for boarded-but-unfinished rooms: finish level, corners and dust control, with the hang-and-tape combo rate shown beside it.
Interior Painting Cost Calculator (Ontario 2026)
New walls or repaint, ceilings, trim and doors, dark colours, occupied homes and stairwells, priced per square foot of wall the way Ontario painters do it.
Drywall Repair Cost Calculator (Ontario 2026)
Patches, cracks, screw pops, water damage, popcorn ceiling removal and skim coats, with the asbestos test a pre-1990 house needs before anyone sands.
Paint & Primer Calculator
Estimate gallons needed for walls and ceilings so you do not buy paint twice and cry once.
Flooring and tile
Flooring Cost Calculator (Ontario 2026)
Hardwood, vinyl plank, laminate, tile and carpet in any mix, room by room at three grades, with tearout, subfloor levelling, moisture control, baseboard, transitions, stairs and HST.
Tile and Shower Cost Calculator (Ontario 2026)
Floor tile, a waterproofed shower pan, wall waterproofing, wall tile by size and pattern, niches, bench, curbless, heated floor, backsplash and demolition, each on its own line the way a tile setter prices it.
Radiant Floor Compatibility Checker
Pick the heating system, the floor covering and the install method; get a verdict, what the floor really runs at against the product sheet, the R-value, and the conditions to write into the quote.
Kitchens and bathrooms
Kitchen Renovation Cost Calculator
The whole kitchen: cabinets through appliances, electrical, plumbing, walls, demolition, permit and contingency, with HST.
Kitchen Cabinet Cost Calculator
Wall runs by the foot, grade, drawers, island, install and trim, at Ontario installed prices.
Countertop Cost Calculator
Square feet, material and tier, cut-outs, edges, waterfall ends and removal.
Bathroom Vanity Cost Calculator
Width, grade, top, sinks, floating or floor-mounted, and three plumbing scenarios.
Sources and further reading
Questions people ask
Are these calculators free?
Yes, all of them, with no account. They give you a realistic range or a code-based number to start a conversation with a builder, designer or inspector. The OBC Code Navigator is the one paid tool on the site, with two free questions.
How accurate are the cost calculators?
They use Ontario pricing updated through 2026 and show the assumptions. Your lot, plan and finishes decide the real number; use the calculators to size the project, then get a quote.
Which calculator should I start with?
If you own a lot, the custom home cost calculator. If you are buying one, the land development calculator. If you are building anything, the HST rebate calculator, because it is the biggest cheque most people forget to claim.
Reviewed and updated October 2026. Costs on this site are Ontario ranges, not quotes; code references are to the Ontario Building Code in force at the date above.
