Renovation Contractors in Oshawa
When it comes to home renovation Oshawa, no two homes are alike — from the historic homes of the downtown core and old south end to the postwar neighbourhoods of central Oshawa and the newer subdivisions of Windfields and Kedron, each has its own character. GMC Construction Inc. has spent 15+ years working across all of them — kitchens, bathrooms, basements and whole-home renovations for Oshawa homeowners who want the job planned properly, priced honestly, and built to last.
What sets us apart in a crowded market: GMC is led by an owner who holds a Master’s degree in Structural Engineering. Before we quote a wall removal, a basement underpinning, or a second-storey addition, we understand how the house actually carries load — which is why our projects don’t run into the structural surprises that stall other renovations. It’s a structure-first approach no other Oshawa renovation company offers.
Our Renovation Services in Oshawa
Kitchen Renovations
Custom cabinetry, islands and full layout changes — from updating a character kitchen in old south Oshawa to a modern layout in a Windfields home.
Bathroom Renovations
Ensuites, main baths and powder rooms with proper waterproofing — the hidden work that makes an Oshawa bathroom last for decades.
Basement Renovations
Finished basements and legal secondary suites — in demand across Oshawa for rental income and for student housing near Ontario Tech and Durham College.
Home Additions
Second-storey additions, rear extensions and garage conversions — the projects where the owner’s structural engineering education matters most.
Whole-Home Renovations
Complete transformations that modernize an older south-end or central Oshawa home top to bottom — one coordinated project, one point of contact.
Condo Renovations
Condo and townhome renovations across Oshawa’s newer developments — managed around board rules and building access.
Renovating in Oshawa: What to Know
Oshawa’s housing offers strong value, and its range shapes the work here. The historic and character homes of the downtown core and old south end are among the area’s oldest and often need careful updating of layouts, wiring, plumbing and insulation. The postwar homes of central Oshawa are solid and ideal for open-ups, additions and basement suites. And the newer subdivisions of Windfields, Northglen and Kedron in the north are large and open, ready for custom kitchens and finished basements. Oshawa also has strong demand for legal basement apartments — both for rental income and for student housing near Ontario Tech University and Durham College.
Legal suites and basement conversions require proper permits, fire separation and structural planning — exactly the work a structure-first contractor gets right up front, protecting both your timeline and your budget.
Do You Need a Permit to Renovate in Oshawa?
Renovation permits in Oshawa are issued by the City of Oshawa’s Building Services, within the Region of Durham framework. Cosmetic work — replacing cabinets, tile, fixtures and finishes in the same layout — generally doesn’t require a permit. But moving plumbing, altering electrical, removing a load-bearing wall, finishing a basement, adding a legal second suite, or building an addition typically do. As a licensed contractor, GMC manages the permit process for you and works with a licensed professional engineer for any stamped structural drawings your project requires — so the work is done to code and passes inspection the first time.
Why Oshawa Homeowners Choose GMC
Structure-first expertise
Led by an owner who holds a Master’s degree in Structural Engineering — so wall removals, additions and basement suites are planned around how your home actually carries load. No other renovation company in Oshawa offers this.
Fixed-price quotes
A detailed, itemized fixed price after a free in-home consultation — the real number you’ll pay, not a low estimate that grows once the walls are open.
84 five-star reviews
A 5.0-star rating across 84 Google reviews, 500+ completed projects, and a written workmanship warranty on every job. Fully licensed and insured with WSIB coverage.
Local knowledge
From downtown Oshawa’s character homes to Windfields new builds and student-rental conversions near the universities, we know Oshawa’s housing and the City of Oshawa permit process firsthand.
One clear schedule
You get a week-by-week timeline before work begins and daily communication throughout — so you always know what’s happening, and when you’ll have your home back.
One team, start to finish
From permits and structural planning to the final finishing touches, your whole project is managed by GMC through a single point of contact — no juggling separate trades or chasing subcontractors.
Recent Work Across Oshawa
From character kitchen updates in the old south end to legal basement suites in central Oshawa and full modernizations of Windfields homes, our Oshawa projects share the same foundation: careful structural planning, a fixed price agreed up front, and finishes that hold up years later. Every project is managed start to finish by GMC — one team, one point of contact, one written warranty. Browse our recent projects to see the quality of our work.
Serving Oshawa & Nearby Communities
GMC Construction serves Oshawa and its neighbouring communities across Durham Region and the GTA:
Ready to Renovate Your Oshawa Home?
Whether it’s a character kitchen in the south end, a legal basement suite for rental income, or a full renovation in Windfields, GMC Construction is ready to help. Call us at 647-450-4466 or request your free, fixed-price quote — and we’ll walk your home with you and plan the project around how it’s actually built.
