Basements, Additions & Outdoor · Markham
Home Additions in Markham
Rear, side and second-storey additions, sunrooms and garage conversions that add space without moving.
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Markham, Scarborough & York Region
Home Additions in Markham
Markham homeowners add space with rear and side additions, second storeys over bungalows and four-season sunrooms, especially where heritage homes and large newer family homes sit on lots with room to grow.
Building permits for additions in Markham are issued by the City of Markham. 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 Markham 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 Markham. 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.
Markham homes
What home additions involves in Markham's houses
Century and heritage homes in Markham
Adding onto an older Markham 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.
1970s to 1990s family homes in Markham
In Markham's 1970s to 1990s neighbourhoods, the most common additions are a larger kitchen and family room at the back, a main-floor primary suite, or a sunroom. Zoning setbacks and lot coverage usually decide how far back and how wide the addition can go.
Newer homes built since 2000 in Markham
Newer Markham 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 Markham
Permits and approvals for home additions in Markham
Building permits
Building permits in Markham are issued by the City of Markham. 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 Markham falls within the Toronto and Region Conservation Authority (TRCA) 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
Markham includes the Unionville and Markham Village heritage conservation districts. Exterior changes to a property in a heritage district, or to a house designated under the Ontario Heritage Act, 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 Markham'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 Markham 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 Markham
Home Additions throughout Markham
Markham mixes heritage streets in Unionville and Markham Village with large newer homes in Cornell, Berczy Village, Wismer and Cathedraltown, many with finished or unfinished basements.
Questions
Home Additions in Markham: FAQs
How do I get a home additions quote in Markham?+
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 Markham project.
What kinds of Markham homes do you work on?+
All of them. Housing in Markham includes century and heritage homes, 1970s to 1990s family homes 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 Markham?+
Only if your property is in a regulated area, such as near a shoreline, river, valley, floodplain or wetland. Much of Markham falls within the Toronto and Region Conservation Authority (TRCA) 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 Markham?+
Yes. We work throughout Markham, including Unionville, Markham Village, Cornell, Berczy Village, Wismer, Cathedraltown, Milliken and Box Grove, and in nearby Richmond Hill, Scarborough, Vaughan, Stouffville and Aurora.
More renovation services in Markham
Alongside home additions, we also handle garden suites and detached ADUs, kitchen renovations and decks and outdoor living in Markham, so related work can be planned together.
Other basements, additions & outdoor services in Markham: basement finishing, legal basement apartments, garden suites & detached adus and decks & outdoor living.
Further reading
Your Markham 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.