What Factors Affect the Cost of Building a Custom Home?
Updated: Sep 28
Let's talk about what really drives up the cost of building a new home or renovation ...
What drives the cost of building a Custom Home or Renovation?
1. Size of the Home
The overall size of the home is naturally one of the largest contributors to the budget. However, doubling the square footage does not necessarily double every project expense.
A smaller home with extremely luxurious finishes and complicated architecture can sometimes cost more per square foot than a larger home with a simpler design.
2. Architectural Design
Architecture has a significant impact on construction costs.
Large open spaces, complex rooflines, oversized windows, cantilevers, floating staircases, tall ceilings and extensive structural steel can increase the cost of construction.
Thoughtful planning between the homeowner, architect and builder early in the design process can help balance architectural goals with the overall budget.
3. Interior Finishes
Interior selections are one of the areas where custom-home budgets can vary most dramatically.
Custom kitchens, natural stone, premium appliances, hardwood flooring, designer plumbing fixtures, custom millwork, specialty lighting and luxury bathroom finishes can substantially affect the final cost.
The advantage of building a custom home is that homeowners can decide where they want to invest and where simpler selections may make sense.
4. The Property and Site Conditions
Two homes with identical architectural plans can have very different construction costs depending on their properties.
Excavation conditions, grading, soil conditions, access for construction equipment, existing trees, neighbouring properties, groundwater and the need for underpinning or shoring can all influence the budget.
This is particularly important when building custom infill homes in established Toronto neighbourhoods.
5. Demolition and Excavation
If an existing home needs to be demolished, demolition and site preparation must be incorporated into the project budget.
Excavation requirements become more significant when constructing deep basements, lowering basement floors or building on properties with challenging soil or groundwater conditions.
6. Windows and Exterior Materials
The exterior of a custom home can represent a substantial portion of the construction budget.
Premium brick, natural stone, architectural panels, custom windows and doors, metal roofing and extensive glazing can significantly increase costs compared with more conventional materials.
7. Mechanical and Smart-Home Systems
Today's custom homes can include sophisticated systems such as radiant heating, multiple HVAC zones, heat pumps, steam showers, whole-home automation, integrated lighting, security systems, generators and electric-vehicle charging.
These features can improve comfort and functionality but should be incorporated into the budget early in the design process.
“It is unwise to pay too much, but it is worse to pay too little." - John Ruskin
Don't Forget the Costs Beyond Construction
One of the biggest mistakes homeowners can make is assuming that the construction price represents the entire project budget.
Depending on the project, additional expenses may include:
Architectural design
Structural and mechanical engineering
Interior design
Surveys
Demolition
Building permits
Municipal fees and applicable development charges
Utility connections
Landscaping
Pools and exterior structures
Specialty consultants
Financing costs
HST, depending on how an estimate or contract is structured
Contingency for unforeseen conditions
Toronto calculates building permit fees according to the type and area of proposed construction, and municipal charges can vary depending on the specific project. These costs should therefore be investigated for the individual property rather than estimated solely from the home's square footage.
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