Kay Developments logo Kay DevelopmentsOntario, Canada

Ontario, Canada

Custom homes. Renovations.Built properly.

A full-service construction company building new homes, additions and basements, commercial and industrial spaces, and the decks and outdoor work in between — right across Ontario. One builder, accountable for the whole job, from the first drawing to the final walkthrough.

Finished custom home with stucco elevation, a two-storey window bay and a covered entry Custom build · Ontario
TARIONRegistered Builder 7+ YearsBuilding in Ontario
200+Projects completed
7+Years of experience
97%Client satisfaction
OntarioService area
Registered Home Builder (TARION)
Fully Insured & Bonded
WSIB Compliant
BBB Accredited Business

What we build

Eight disciplines, one standard.

Custom homes, renovations, additions and outdoor work. Whatever you need built, we handle it from the first drawing to the final walkthrough — and you deal with one person the whole way.

Custom home in stucco and stone with timber brackets 01

Built from the ground up

Custom Homes

One-off homes managed end to end. Design coordination, permits, every trade scheduled and supervised, through to the day you get the keys.

  • Architectural & engineering coordination
  • Permits and Ontario Building Code
  • Full trade management to handover
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Three-storey infill home under construction on a narrow lot 02

From an empty lot

New Builds

Ground-up residential construction. Infill lots, tear-down rebuilds, secondary suites and garden suites, all run on one schedule.

  • Zoning and feasibility checked first
  • Excavation, foundation and framing
  • Services and occupancy handled
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Finished rear extension in brick with a gable window and aluminium bifold doors 03

More house, same address

Home Extensions

Rear extensions, second storeys and side additions, tied into the existing structure so the finished house doesn’t read as two halves.

  • Structural review before design
  • Roofline and cladding tie-ins
  • Sequenced so you can stay put
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Renovated kitchen in white shaker cabinetry with stone counters 04

The heart of the home

Kitchens & Bathrooms

Gut renovations including the structural and mechanical work most finishing crews won’t touch. We change the plan, not just the surfaces.

  • Load-bearing walls removed and beamed
  • Relocated plumbing and new circuits
  • Waterproofing done to spec
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Finished basement living area with plank flooring and a stone fireplace 05

Reclaim the space below

Basement Finishing

The cheapest square footage you can add. Moisture, headroom and light are planned before a single stud goes up.

  • Continuous vapour barrier
  • Bulkheads that keep your ceiling
  • Bathroom rough-ins and egress
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Commercial floor mid fit-out with steel stud partitions and services overhead 06

Spaces that work for business

Commercial

Retail and office fit-outs, unit renovations and tenant improvements, scheduled around the hours you actually trade.

  • Fit-outs from shell or existing
  • Evening and weekend scheduling
  • Base-building coordination
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Raised composite deck with white railing and a full stair run 07

Where the summer happens

Decks & Outdoor Living

Cedar and composite decks, pool surrounds, pavilions and stone patios, built on footings dug below the frost line.

  • Footings below the frost line
  • Pool decks and pavilions
  • Stone patios, grading and lighting
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New cedar board fencing running between two backyards under a blue sky 08

Straight in ten years

Fences

Board-on-board, privacy and horizontal cedar fencing. The part you can’t see is the part that decides how long it lasts.

  • Posts set below the frost line
  • Locates and property line confirmed
  • Gates braced to stay square
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Selected work

Proof in every detail.

Four recent jobs across Ontario. Pick a trade to see the rest, or open any photo full screen.

Before & after

Drag the handle.

Two jobs where the photograph does the arguing. Pull the slider across to see what was there before we started.

Kitchen renovation

Oak cabinets, brick backsplash and sheet vinyl out. White shaker, stone counters, subway tile and oak floors in. The skylight stayed — reframed and squared.

The renovated kitchen in white shaker cabinetry with stone counters
The original kitchen with oak cabinets and brick backsplash
BeforeAfter

Backyard studio

Framed and wrapped one week; black board-and-batten, cedar entry and soffit lighting the next. Pergola, gravel terrace and fire pit finished the yard around it.

The finished studio clad in black board-and-batten
The same studio mid-build, framed and wrapped
BeforeAfter
Finished basement with plank flooring and a stacked-stone fireplace Case study

One project, start to finish

1,250 square feet nobody was using.

An unfinished basement turned into the most-used floor of the house — family room, bar, three-piece bathroom and a guest room. Follow it from bare framing to handover, including how we kept the ceiling height.

Scope1,250 sq ft
Duration7 weeks
Completed2025
Read the full project →

Client trust

Built on word of mouth.

“They gave us a schedule at the start and actually held to it. The site was swept every Friday. That alone told us what kind of builder we’d hired.”

DRHomeownerDurham Region · Custom home

“We added a second storey over a house we were still living in. They sequenced it so we were never without a working kitchen or bathroom.”

YRHomeownerYork Region · Second-storey addition

“Deck, pergola and fence in one go. Three quotes came in before theirs and none of them explained the footings the way Kay did.”

GTHomeownerGreater Toronto Area · Outdoor living

Start a project

Let’s build something that lasts.

Tell us the property, the idea and a rough timeline. We’ll tell you what’s realistic, what it costs, and when we could start.

Or call directly437-994-9196

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Free estimates, no obligation. We usually reply within one business day.

Free estimatesNo-obligation quotes on every project
Fixed written scopeChanges priced and approved before the work
Weekly updatesPhotos and a note, so you always know where it stands
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