Ajax Deck Builder · Reformity Inc.Deck Builders in Ajax
Ajax regulates a deck as a platform, and the number that matters most is 1.2 m above finished ground. Below it, a deck can take up to half the yard it sits in, 1.8 m from the rear lot line. Above it, which is typical off the main floor of a house with a walk-out basement, the deck is capped at 30 m² and the rear setback grows to 4.0 m. The by-law's definition leaves stairs out of the platform, so the stair run down to the yard doesn't count against those 30 m².
Decking · real projects
Recent decking jobs across the GTA.
Real Reformity jobs from our project files. Customer addresses are never published.
Deck drawing — framing plan — Framing plan, section through the deck and elevation. Click to enlarge.
Deck drawing — elevations & details
Drawn before we build
Drawn before we build in Ajax.
Every deck starts with a framing plan, footing layout, and guard and stair details sized for your yard. When your city requires a permit, the drawing set goes in with the application and the inspector checks the build against it.
Decking permits in Ajax
Ajax lists decks and porches as building permit work, and its deck checklist asks for a site plan or survey plus fully dimensioned drawings showing pier size and depth and how the deck anchors to the house — Reformity prepares those drawings and pulls the permit.
- Dimensions to your lot lines
- Materials, sizes and spacing
- Footing and base sections
- Code notes for the inspector
Where Ontario's Building Code requires a BCIN-qualified designer or a professional engineer for permit drawings, that sign-off is part of the drawing set.
How our drawings workTown of Ajax rules
Decking rules in Ajax.
Checked against official municipal and provincial sources. Lots differ, so we confirm the rules for your address at the quote visit.
Trees
Ajax's Tree Protection and Boulevard Tree Protection by-laws cover trees in parks and open space, the Greenbelt, environmentally sensitive land, lands under development applications and street boulevards; ordinary backyards aren't on that list. Injuring or removing a boulevard tree needs approval, and woodlands of 1 ha or more fall under Durham Region's woodland by-law.
Town of Ajax: tree protection (PDF)Conservation areas
Most Ajax residents (86%) live within TRCA's jurisdiction. TRCA regulates development in or near valley and stream corridors, wetlands and the Lake Ontario shoreline; inside a regulated area, a deck, pool or shed can need a TRCA permit, and the Town can't legally issue a building permit until TRCA has given a permit or clearance.
TRCA: decks & permitsDeck permits
Decks and porches are one of Ajax's listed building permit types, and the Town doesn't publish a size or height below which a deck is exempt, so we confirm with the building department for each design. The permit needs a site plan or survey and fully dimensioned drawings showing pier size and depth and, for an attached deck, how it anchors to the house.
Town of Ajax: building permitsDeck size limits
Ajax zoning treats a deck as a platform and sizes it by height above finished ground. Under 1.2 m, it can cover up to half the yard it sits in and must be 1.8 m from the rear lot line; over 1.2 m, it's capped at 30 m² and 4.0 m from the rear lot line. It must also meet the zone's interior side yard setback, and stairs don't count as part of the platform.
Ajax Zoning By-law s.4.3 (PDF)
What we build in Ajax
Custom decks for outdoor living.
- Composite
- Pressure-Treated Pine
- Cedar
- Railings & Rails
Neighbourhoods
Decking across Ajax.
- Pickering Village
- Memorial Village
- Southwood
- Lakeside
- Discovery Bay
- Pickering Beach
- Applecroft
- Westney Heights
- Nottingham
- Hermitage
- Salem Heights
- Audley North
Ajax Decking FAQ
Quick answers.
It can. If your lot is in a TRCA regulated area, within or near a valley or stream corridor, a wetland or the Lake Ontario shoreline, a new deck can count as development that needs a TRCA permit, and the Town can't legally issue the building permit until TRCA has given a permit or clearance. TRCA's Regulated Area Search shows whether your lot is affected.
Decks and porches are one of Ajax's listed building permit types, and the Town doesn't publish a size or height below which a deck is exempt, so we confirm with the building department for each design. The permit needs a site plan or survey and fully dimensioned drawings showing pier size and depth and, for an attached deck, how it anchors to the house.
Ajax's Tree Protection and Boulevard Tree Protection by-laws cover trees in parks and open space, the Greenbelt, environmentally sensitive land, lands under development applications and street boulevards; ordinary backyards aren't on that list. Injuring or removing a boulevard tree needs approval, and woodlands of 1 ha or more fall under Durham Region's woodland by-law.
Send the form on this page or call 437-241-6287. We reply within one business day, visit your Ajax property to measure and check the Town of Ajax rules for your lot, and give you a fixed written price.
Free on-site quote
Planning decking in Ajax?
We'll measure, check the Town of Ajax rules for your lot, draw it up and give you a fixed written price. One business-day reply.