Home Additions & Garage Builds in South Georgian Bay

Expand your living space with a professionally built addition or detached garage. Designed to integrate seamlessly with your existing home and built to perform in our climate.

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Serving South Georgian Bay since 1992 · $5M liability coverage · Certified ICF installer

Since 1992

400+ Church Projects

$5M Liability Coverage

Certified ICF Installer

2026 Contractor of the Year

Sometimes the home you love just needs more space. Whether you need an extra bedroom, a larger kitchen, a main-floor primary suite, or a detached garage with a workshop, Mighton Construction builds additions that integrate seamlessly with your existing home — structurally, aesthetically, and mechanically.

Types of Additions We Build

Single-storey additions — family rooms, primary suites, sunrooms, and expanded kitchens
Second-storey additions — adding an entire floor to a bungalow or raising the roof on a cape cod
Bump-outs — smaller extensions that make a meaningful difference to a kitchen, bathroom, or mudroom
Detached garages — from basic two-car garages to oversized workshops with heated lofts, bonus rooms, or studio apartments above
Attached garages — integrated with your home’s roofline and connected by a mudroom or breezeway

Building Considerations in South Georgian Bay

Adding onto a home in our region involves more than framing and finishes. We address zoning setback requirements, which vary by municipality across Collingwood, Wasaga Beach, Clearview, and the Blue Mountains. We evaluate septic capacity, which often needs to be upgraded when adding bedrooms. We navigate conservation authority regulations for properties near water or within regulated areas. And we engineer every addition for our snow loads and frost depths.

Matching an addition to an existing home also requires attention to detail that goes beyond code compliance. Rooflines need to align. Exterior materials need to blend. Interior floor levels and ceiling heights need to transition naturally. This is where experience matters.

Garage Builds

Detached garages in South Georgian Bay range from straightforward two-car structures to fully finished buildings with heated workshops, storage lofts, and living space above. Many clients use a detached garage as a home office, guest suite, or rental unit where zoning permits. We build garages with the same quality standards we apply to our homes.

Get a Realistic Estimate

Every addition is different. Contact us to discuss your project and receive a detailed, transparent estimate based on your specific home and goals.

Budget & planning guidance

Home additions typically range from $350–$650+/sqft depending on complexity. Detached garages range from $75k–$250k+ depending on size, finishes, and whether living space is included above.

Costs vary by design, site conditions, materials, drawings, and approvals. These planning ranges are not quotes.

Our process

On-Site Assessment

We evaluate your existing home's structure, foundation, and mechanical systems to determine the best approach for your addition. We also review zoning setbacks, lot coverage limits, and septic capacity.

Design & Engineering

Working with your architect or our design partners, we develop plans that integrate structurally and aesthetically with your existing home. Engineering drawings are prepared for permit submission.

Permitting & Approvals

We handle building permit applications, conservation authority submissions if required, and any site plan or committee of adjustment processes.

Construction

Our crew manages demolition, foundation work, framing, roofing, and all mechanical and finish trades. We take care to protect your existing living space throughout construction.

Integration & Completion

We ensure the addition connects seamlessly to your existing home — matching rooflines, siding, and interior finishes so the new space feels like it was always part of the house.

Frequently Asked Questions

How much does a home addition cost in South Georgian Bay?

Additions typically range from $350–$650+/sqft, depending on the type of space (living area vs. garage), structural complexity, foundation requirements, and finish level. A detailed budget is provided before construction begins.

Can you add a second storey to my existing home?

In many cases, yes. A second-storey addition requires a structural assessment of your existing foundation and walls. We will determine whether your home can support the additional load or if reinforcement is needed.

Do I need to move out during construction?

For most additions, you can remain in your home. We isolate the construction area from your living space. For projects that involve significant structural work to the existing home, temporary relocation may be more comfortable.

What about my septic system?

Adding bedrooms or living space often requires a septic system review or upgrade. We coordinate septic assessments early in the planning process to avoid surprises. This is especially important in rural areas of Simcoe County and along the Georgian Bay shoreline.

How long does an addition take to build?

A typical single-storey addition takes 4–6 months. Second-storey additions and larger projects can take 6–10 months. Permitting timelines vary by municipality but typically add 4–8 weeks.

Ready to start your project?

Request a Consultation