Concrete sealing cost per square foot depends on the surface, the sealer and, above all, the prep work, so the honest way to price it is to measure your slab and compare written quotes by area. Contractors usually quote a job total with a minimum, while DIY cost is materials, rentals and your time. This guide shows how to work out both for an Ontario driveway, patio or walkway.
In This Article
- Concrete sealing cost per square foot: how to work it out
- How the price changes by surface
- Sealer type and what it does to the price
- Why prep costs more than the sealer
- How much concrete sealer do I need? DIY materials
- Concrete sealing DIY or a professional: where each makes sense
- Getting a concrete sealing quote in Kitchener-Waterloo
- Concrete sealing cost questions
Concrete sealing cost per square foot: how to work it out
Any per-foot figure you read online is an average of very different jobs, so this guide gives you the method instead. Once you have a quote, three steps turn it into a number you can compare.
- Measure the slab. Multiply length by width. For an L-shape or curved edge, split the area into rectangles and add them up. Subtract planters or other areas that will not be sealed.
- Convert if you measured in metres. One square metre is about 10.76 square feet. A driveway 6 m by 9 m is 54 square metres, or about 581 square feet. A walkway 1.2 m by 12 m is 14.4 square metres, or about 155 square feet.
- Divide the quote by the area. Cost per square foot is the total quote divided by square feet. For cost per square metre, divide by square metres.
Expect small jobs to look expensive per foot. Contractors set a minimum so that a visit pays for the trip, which means the per-foot figure drops as the area grows. A single walkway and a full driveway are not priced on the same curve.
Want an exact price for your home?
Skip the guesswork: we look at your actual property and quote it in writing, free and no-obligation. Serving Kitchener, Waterloo, Cambridge & Guelph.
How the price changes by surface
The same sealer on two different surfaces can mean very different work. Here is what changes with each.
| Surface | What adds work | What to ask |
|---|---|---|
| Driveway | Large area, oil stains, salt scaling, cracks and joints that need filling | Is cleaning and crack repair in the price? |
| Patio | Furniture to move, edges at the house, planters, drainage | Who moves furniture, and how are edges protected? |
| Walkway and steps | Narrow runs, step faces and edges, slip risk when wet | Is a slip-resistant finish available? |
| Stamped concrete | Texture that traps dirt, colour that can look different after sealing | Which sealer, how glossy, and how is it cleaned first? |
| Exposed aggregate | A porous, rough surface that absorbs more sealer | How many coats, and how is coverage judged? |
Stamped and decorative work is the one place where a cheap quote deserves a second look. Mistakes show in the finish, and our guide to fixing white, cloudy stamped concrete sealer shows what a poor application can leave behind.
Sealer type and what it does to the price
Concrete sealers fall into two main groups, and they are priced and applied differently.
- Penetrating sealers (silane or siloxane types) soak into the slab and usually leave the surface looking natural. They suit exposed Ontario driveways and walkways where winter salt and freeze-thaw are the threat.
- Film-forming sealers (acrylics and similar coatings) sit on top. They can add gloss and deepen colour, which is why they are common on stamped patios. They can wear in traffic lanes, and some are slippery when wet, so ask about an anti-slip additive.
Price per pail does not tell you the cost. What matters is the cost per coat of the area, multiplied by the number of coats, divided by how many years the seal lasts before it needs redoing. Ask the maker's stated reapplication interval for Ontario conditions, and read our guide to how long concrete sealer lasts in Ontario before you compare a cheap seal that needs redoing soon with a dearer one that does not.
New concrete has its own timing. Follow the sealer maker's instructions on how long to wait, and see when to seal new concrete in Waterloo Region.
Why prep costs more than the sealer
On most jobs, the sealer is the smaller part of the bill. The bigger part is getting the slab ready, because sealer will not hold over dirt, oil or a failing old coat.
- Cleaning. Dirt, algae, salt residue and tire marks come off first, usually by pressure washing. Our guide to pressure washing concrete explains the method and the risk of damage from too much pressure.
- Degreasing. Oil stains block penetrating sealers and leave dark patches under film-forming ones.
- Repairs. Cracks and open joints are filled before sealing, or water goes straight into the slab. Deep scaling or spalling may need patching.
- Stripping. A peeling or cloudy old film-forming coat usually has to come off before a new one goes on.
- Drying. The slab has to be dry before sealing, which can stretch a job over two days.
When two quotes differ by a wide margin, ask what prep each one includes. The cheaper one often skips the step that decides how long the seal lasts.
How much concrete sealer do I need? DIY materials
Start with the label. Every sealer states how much area a container covers per coat, and the figure is for average, smooth concrete. Porous, broom-finished or aggregate surfaces drink more, so the real coverage is lower. Follow the label for the number of coats.
The sum is area divided by coverage, multiplied by coats, then rounded up with a little extra for edges and mistakes. As an example only, if a label gave 20 square metres per container per coat, a 54 square metre driveway needing two coats would call for about 5.4 containers, so you would buy six.
The sealer is rarely the whole shopping list. Add the following and price them before you decide DIY is cheaper:
- Concrete cleaner or degreaser, and a pressure washer rental if you do not own one.
- Crack filler or joint sealant.
- A roller, sprayer or applicator that suits the product, plus masking tape and drop sheets.
- Safety gear that the label calls for. Solvent-based products need good ventilation and often a respirator.
- Your time for cleaning, drying, two coats and the keep-off period.
Concrete sealing DIY or a professional: where each makes sense
DIY is realistic for a small, sound, flat patio or short walkway when you can wait for good weather. Most labels set a minimum surface temperature and need a dry spell after application, which in Ontario points to late spring through early fall. Check the label for the exact limits.
Hire a crew when the area is large, when the surface is stamped or decorative, when old sealer must be stripped, or when steps and edges make the work awkward. A mistake costs more to undo than to avoid, because failed film-forming sealer has to be stripped before the surface can be redone. Professionals also bring the equipment and the experience to judge dryness, porosity and coverage.
Whichever route you take, do not compare a DIY materials total with a professional quote without adding the rentals, repairs and your own hours to the first, and checking that the second includes the same prep.
Getting a concrete sealing quote in Kitchener-Waterloo
A useful written quote names the area, the cleaning and repairs included, the product and its type, the number of coats, the keep-off time and what happens if rain interrupts. If any of those is missing, ask. D&D Home Services does concrete sealing in Kitchener-Waterloo, Cambridge and Guelph. Quotes are free and confirmed in writing before work begins, and the price is set after the surface is seen, since condition and prep decide most of it.
Concrete sealing cost questions
How much does it cost to seal concrete per square foot?
It varies with surface, sealer type, condition and the prep needed, so one figure would mislead. Work it out by dividing a written quote by your measured area in square feet. Small jobs cost more per foot because of minimum charges, and a slab needing cleaning, repairs or stripping costs more than a clean, sound one.
How much concrete sealer do I need?
Divide your area by the coverage on the label, multiply by the number of coats and round up. Porous or textured concrete absorbs more, so real coverage is lower than the label suggests for smooth slabs. Buy a little extra, since running short mid-coat leaves visible lap marks. Follow the manufacturer's instructions for coats and drying times.
Is concrete sealing cost per square metre different from per square foot?
Only in the unit. One square metre is about 10.76 square feet, so a price per square metre is roughly ten times a price per square foot. Check which unit a quote uses before comparing, and measure your slab in the same unit so the maths is clean.
Does sealing stamped concrete cost more?
Often, because the texture needs a thorough clean, sealer must be applied evenly, and the finish shows mistakes. Film-forming sealers are common on stamped surfaces, and they may need recoating or stripping over time. Ask the contractor which product they plan to use and how they avoid cloudy or blotchy results.
Key Takeaways
- Work out cost per square foot by dividing a written quote by your measured area; one square metre is about 10.76 square feet.
- Small jobs cost more per foot because of minimum charges, and prep often outweighs the sealer in the price.
- Compare quotes on the same prep: cleaning, crack repair, stripping, coats and product type.
- For DIY, add rentals, cleaners, applicators and your own time to the cost of the sealer, using the label's coverage.
- Stamped, decorative and previously sealed concrete are the jobs most likely to go wrong without a professional.
Request a home-service quote
Select the service you need and describe the work area and access.