For Interior Designers · Durham Region & the GTA

The Build Partner Who Delivers Your Vision — Exactly as Drawn

Sound familiar? Here are the questions worth asking your builder before your next handoff.

When a build runs late, who does your client blame — the builder, or you?

Has a contractor ever changed your design choices without asking?

How often are you chasing your builder just to find out what's happening on site?

The Designer's Builder

Commercial Discipline, Brought Home

You've felt what a careless builder costs you. Here's the difference: we bring the systems of a commercial job to your design — so your work is protected from the first plan to the final walkthrough.

Design rendering of a kitchen before construction The Plan
The finished kitchen built exactly to the rendering The Build

A real Cornerstone project — rendered, then built exactly as drawn.

Commercial Standards, Residential Care

For 35+ years we ran fit-ups for national brands. We bring that same discipline to your design.

  • Built to commercial spec, with Level 4 finishes.
  • Held to a standard most home crews never reach.
  • Your design executed exactly as drawn.

We Build to Your Plans, Not Around Them

Your choices are your choices. We never quietly swap them out to make our job easier.

  • No value-engineering behind your back.
  • No "we couldn't get it, so we changed it."
  • If something must change, you hear it first.

One Team, Start to Finish

Mike or a named supervisor is on your job every day. You always know who is in charge.

  • Every trade works under one accountable roof.
  • You and your client are never left guessing.
  • One point of contact, from first plan to final walkthrough.

What You Get

Handled at Every Stage

Pre-Construction Planning

Site Management

Our Guarantees

Post-Construction

From Your Chair

How We Work Together

You've already done the hard, creative work. Our job is to build it — exactly as you drew it — without ever putting your client relationship or your reputation at risk. Here's what that looks like from the moment you hand off your plans.

You Hand Us Your Drawings

We build from your plans — not a reinterpretation of them. Your layout, your finishes, your spec. We review everything up front, flag any construction detail that needs resolving in the real world, and confirm it with you before a tool comes out. Nothing gets value-engineered to make our job easier.

One Name Owns Your Project

Mike or a named site supervisor is on your job every day and is your single point of contact. Questions route through you — never around you to your client. You always know exactly who is accountable, and your client only ever hears your vision, not our shortcuts.

You See Everything, Without Chasing

Daily site photos and logs post straight to your project portal. You can check progress between client meetings without a single "any update?" text. One login covers every project we're running for you.

Built to Commercial Spec, Finished to Level 4

Thirty-five years of commercial fit-ups for national brands, brought to your residential design. Held to a standard most home crews never reach — so the finished room matches the renderings you showed your client.

A Handover That Makes You Look Good

We close with a clean, commercial-style handover: a spotless site, an Owner's Manual with care and warranty details, and a full photo history of the build. Your client experiences your vision delivered — with your name on it.

Designer Questions

What Designers Ask Us

Do you pay interior designers a referral fee?

No — and that's deliberate. The moment a builder is paying a designer behind the scenes, the client has to wonder whose interest is really being served. That puts your relationship at risk, not ours. We'd rather earn your repeat business the honest way: by protecting your design, hitting your dates, and making you look good on every job.

Will you change my design or finishes without asking?

Never. We build to your plans, not around them. We don't value-engineer behind your back or quietly swap a spec because something was easier to source. If a real-world condition forces a change, you hear it first and you make the call.

Will you try to take my client?

No. Your client is your client. We communicate through you, not around you, and we're there to execute your vision — not to insert ourselves into the relationship you built.

Do you work from my drawings, or do you redraw everything?

We build directly from your drawings. We review them up front, resolve any construction details that need a builder's eye, and confirm anything unclear with you before we start — but the design stays yours.

How do I stay informed while you're on site?

Through your project portal. Daily photos and site logs post automatically, so you can check progress between meetings without chasing anyone. You also have one named point of contact — Mike or your site supervisor — every day of the build.

What kinds of projects do you take on from designers?

Kitchens, bathrooms, whole-home renovations, additions, and full interior fit-ups across Oshawa, Durham Region, and the GTA. If you're designing it, we can build it — to commercial standards, on a fixed, locked-in price.

Are you licensed and insured?

Yes — a fully licensed and insured Ontario corporation. Every project is backed by our 5-year workmanship warranty and our $300-a-day on-time guarantee.

A Builder Who Protects Your Name

When a designer hands off a project, your reputation rides on the build. We protect your design, your timeline, and your name — on every job.

Mike Brock, Founder of Cornerstone Construction

"When a designer brings me their plans, they're trusting me with their reputation. I build it exactly as drawn, hit the date, and make sure their client sees their vision come to life — not my shortcuts."

Mike Brock, Founder