Renovation Contractor in Oshawa & Durham Region
The Cornerstone Certainty Stack
The number we quote is the number you pay. No surprises. No add-ons. No last-minute invoices that are double what you expected. What we put in your proposal is locked in — period.
Here is the dirty secret of this industry: a lot of contractors win the job with a low number, then pile on "extras" once your kitchen is torn apart and you have no choice but to pay. By the time it's done, the final bill is thousands more than the quote. The Price Lock Guarantee exists so that never happens to you. We price the whole job up front, in detail, and we hold that price — even when our own costs go up.
Every project is a lump-sum, fixed-price agreement. The full price is set before any work begins and written into your proposal, line by line.
Why it matters: You know your total number before you commit. No "we'll see how it goes," no open-ended hourly billing that balloons.
If lumber jumps, if a supplier raises prices mid-job, if the labour takes longer than we planned — that is our problem to absorb, not your bill to cover.
Why it matters: With a fixed price, Cornerstone takes on 100% of the risk for material price spikes and labour overruns. Your price doesn't move because our costs did.
Your proposal breaks the work down line by line — every trade, every material, every step. The detail is what makes the lock real.
Why it matters: A vague one-line quote is where surprise costs hide. A detailed, itemized proposal is a price you can actually hold us to.
We will always be straight with you, so here is the only thing that changes a locked price: a change you ask for. If you decide partway through to upgrade your countertop, add a pot filler, or change a finish you already chose, that is new scope — and we handle it through a written Change Order you approve before the work happens, so the new cost is never a surprise either. The same goes for genuinely hidden conditions no one could see until we opened the wall, like old knob-and-tube wiring or concealed water damage. You always see the number and say yes before anything moves. What never changes the price is our side of it — our material costs, our labour, our time. That risk is ours.
Yes. The price in your signed proposal is the price you pay for the work in that proposal. If our costs go up after you sign — materials, labour, anything on our side — we absorb it. The only thing that changes your number is a change you ask for, handled through a Change Order you approve first.
A Change Order is a short, written add-on to your contract for any work that wasn't in the original plan — usually because you decided to upgrade or add something, or because we uncovered a hidden condition behind a wall. You see the cost and approve it in writing before that work starts. Nothing gets added to your bill without your say-so.
That's our problem, not yours. A fixed-price agreement means Cornerstone carries the risk of price spikes and labour overruns. Your price was locked when you signed, and a jump in our costs does not change it.
Occasionally a renovation uncovers something no one could see when we quoted — old wiring that isn't to code, concealed water damage, or similar. If that happens, we stop, show you exactly what we found, and give you a price to address it through a Change Order. You decide whether and how to proceed before any extra work or cost happens.
Sometimes because they've left things out that they plan to bill you for later, once you're committed and the job is torn apart. A detailed, fixed price can look higher on paper than a vague low quote — but it's the number you'll actually pay, and that's usually the cheaper outcome in the end. We'd rather show you the real number up front.
A renovation is a big investment, and you deserve to know exactly what it costs before the first wall comes down. That's the whole point of the Price Lock Guarantee — a detailed, fixed price you can plan around, backed by a company that carries the risk so you don't have to. That's what "We Deliver" really means.
Durham Region's trusted renovation contractor. Led by Mike Brock since 2017. We Listen, We Build, We Deliver.