Basements, Additions & Outdoor · Oshawa
Home Additions in Oshawa
Rear, side and second-storey additions, sunrooms and garage conversions that add space without moving.
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Oshawa, Durham Region
Home Additions in Oshawa
In Oshawa, an addition is often the answer for families who love their street in Downtown Oshawa and Lakeview but have outgrown the house. With post-war bungalows, older downtown homes and newer north-end subdivisions, rear additions, second storeys and main-floor suites are all common.
Building permits for additions in Oshawa are issued by the City of Oshawa. We tell you up front whether your project needs one, prepare or coordinate the drawings, and book the inspections so the work is signed off properly.
We plan Oshawa additions from zoning and drawings through foundations, framing, roofing, mechanical tie-ins and finishing, matching the exterior to the existing house so the addition looks like it was always there.
Call (647) 424-1511 or send the form on this page for a free home addition quote in Oshawa. Tell us what you want to change, add a few photos of the space, and we will book a visit and send a written quote that lists the scope, the materials, the permits involved and the schedule.
Oshawa homes
What home additions involves in Oshawa's houses
Century and heritage homes in Oshawa
Adding onto an older Oshawa home means matching brick, siding, rooflines and window proportions so the addition looks original, and tying new framing into old framing that is rarely square. Where the house is designated or in a heritage district, the exterior design needs heritage approval too.
Post-war bungalows and back-splits in Oshawa
Oshawa's post-war bungalows sit on generous lots, which makes them ideal for rear additions or a second storey. Going up needs an engineer to confirm the existing foundation and walls can carry the load, and many bungalows can, with reinforcement where needed.
Newer homes built since 2000 in Oshawa
Newer Oshawa lots are often tighter, so additions tend to be compact: a sunroom, a covered porch or a modest rear extension. We check zoning and any subdivision agreement restrictions before design starts.
Rules in Oshawa
Permits and approvals for home additions in Oshawa
Building permits
Building permits in Oshawa are issued by the City of Oshawa. Electrical work anywhere in Ontario is done by a licensed electrical contractor under an Electrical Safety Authority (ESA) permit. We confirm what your project needs before you sign and book every inspection.
Conservation authority
Much of Oshawa falls within the Central Lake Ontario Conservation Authority (CLOCA) watershed. Building near a shoreline, river, floodplain, valley or wetland can need a conservation authority permit before the municipality will issue a building permit. We check the regulation mapping for your property early so it does not hold up the schedule.
Heritage properties
If your Oshawa home is designated under the Ontario Heritage Act or sits in a heritage conservation district, exterior changes generally need heritage approval as well as a building permit. We check your property's status before design starts.
Testing before demolition
Homes built before the 1990s can contain asbestos in plaster, textured ceilings, floor tile, vermiculite insulation and pipe wrap, and homes from before the 1960s often have lead paint. In Oshawa's older houses we test suspect materials before demolition and handle them by the regulations if they are found.
The service
Additions That Look Like They Were Always There
An addition gives you space that no renovation inside the existing walls can: a bigger kitchen and family room, a main-floor primary suite, a sunroom, or a second storey over a bungalow. For many families it is the alternative to moving out of a neighbourhood they love.
Additions are full construction projects. They start with drawings and, in most cases, zoning review and a building permit. Then come foundations, framing, roofing, windows, mechanical tie-ins and the interior finishes, all tied into the existing house so the roofline, siding and floors line up.
More about home additions →The process
How your Oshawa project comes together
01
Consultation
Tell us what you want to change and send a few photos. We visit, measure and talk through options.
02
Written Quote
A clear scope, materials, permits and schedule, in writing. No vague allowances.
03
Permits & Planning
Drawings, permits and material orders lined up before demolition starts.
04
Build & Walk-Through
Work done in the right order, inspected where required, and walked through with you at the end.
Across Oshawa
Home Additions throughout Oshawa
Oshawa has older homes around downtown and the original auto-plant neighbourhoods, post-war bungalows across the south and east, and newer subdivisions in Windfields, Taunton and Northglen near Durham College and Ontario Tech University.
Questions
Home Additions in Oshawa: FAQs
How do I get a home additions quote in Oshawa?+
Call (647) 424-1511, use the form on this page or email info@ontariorenovationcompany.com. Tell us what you want to change and send a few photos, and we will book a visit and send a written quote for your Oshawa project.
What kinds of Oshawa homes do you work on?+
All of them. Housing in Oshawa includes century and heritage homes, post-war bungalows and back-splits and newer homes built since 2000, and each comes with its own considerations, from older wiring and foundations to builder warranties, septic systems and shoreline rules. We plan the work around the house you actually have.
Do I need a conservation authority permit in Oshawa?+
Only if your property is in a regulated area, such as near a shoreline, river, valley, floodplain or wetland. Much of Oshawa falls within the Central Lake Ontario Conservation Authority (CLOCA) watershed. We check the mapping for your address before applying for the building permit.
Do I need a permit for an addition?+
Yes. Additions need a building permit, and many need zoning review for setbacks, height and lot coverage. Some also need a minor variance. We check what your lot allows before drawings are finalized.
Is it better to build up or out?+
It depends on your lot, zoning, foundation and how you want to use the space. Building out keeps everything on one level; building up preserves the yard. We walk through both during the visit.
Can we stay in the house during an addition?+
Usually, yes, because most of the work happens outside the existing walls until the final tie-in. We plan the connection to keep disruption as short as possible.
Do you build sunrooms?+
Yes. A four-season sunroom built as a proper insulated addition can be used year-round, unlike a three-season enclosure.
Do you offer home additions across Oshawa?+
Yes. We work throughout Oshawa, including Downtown Oshawa, Lakeview, Eastdale, McLaughlin, Northglen, Taunton and Windfields, and in nearby Courtice, Ajax, Bowmanville, Pickering and Newcastle.
More renovation services in Oshawa
Alongside home additions, we also handle garden suites and detached ADUs, kitchen renovations and decks and outdoor living in Oshawa, so related work can be planned together.
Other basements, additions & outdoor services in Oshawa: basement finishing, legal basement apartments, garden suites & detached adus and decks & outdoor living.
Further reading
Your Oshawa renovation, done properly.
Tell us what you want to change and send a few photos. We will book a visit and send a clear written quote, with no obligation.