Basement Underpinning · Aurora & York Region
Basement Underpinning in Aurora & the GTA
Expert basement underpinning and foundation lowering in Aurora, Newmarket, Richmond Hill, and York Region. Permit-ready, engineer-coordinated, and built to Ontario Building Code by Greyfield Construction.
Basement Underpinning in Aurora & York Region
Lower Your Basement. Unlock Your Home.
Many older homes in Toronto, Aurora, Newmarket, and across York Region were built with low basement ceilings — often just enough clearance for mechanical systems but not for comfortable living. Basement underpinning changes that. By lowering the basement floor and reinforcing the foundation at a greater depth, we create the headroom needed to transform an underused space into a fully livable part of your home. With today’s focus on allowable basement apartments, lowering the basement to provide minimum ceiling clearance just makes good sense.
Whether you are planning a legal secondary suite, a family recreation room, a home office, or simply want to add usable square footage without changing your home’s footprint, basement underpinning is one of the most cost-effective structural investments available to homeowners in these neighbourhoods.
What Is Basement Underpinning?
Basement underpinning is a structural process in which the existing foundation is excavated section by section and rebuilt at a deeper level. This lowers the basement floor — typically by 24 to 36 inches — while reinforcing the foundation walls and footings throughout. The result is a stronger foundation and significantly increased ceiling height.
This is not a simple excavation project. It requires structural engineering, permit approval from your local municipal inspections, careful sequencing to maintain structural integrity throughout, and a team with direct experience in foundation work. Greyfield Construction brings all of this expertise to every underpinning project we take on.
Our Underpinning Process
- Structural assessment and soil evaluation
- Engineer-coordinated design drawings and footing specifications
- Full permit application to your local municipality — Toronto, Aurora, Newmarket, Richmond Hill, or King City
- Sequential excavation to maintain structural support at all times
- New concrete footing installation at the greater depth
- Foundation wall reinforcement where required
- New basement floor slab installation
- New under-slab drains
- Waterproofing and drainage integration
- All Municipal inspections coordinated through to final sign-off
Underpinning vs. Bench Footing — What Is Right for Your Home?
There are two primary methods of basement lowering used in Ontario: full underpinning and bench footing. Full underpinning extends the existing foundation deeper into the ground and maximizes the usable floor area. Bench footing creates a concrete ledge around the perimeter instead of fully extending the footings — it costs less but reduces floor space by the width of the bench. Greyfield will assess your home and recommend the right approach based on your goals, soil conditions, and budget.
Serving Toronto, Aurora, Newmarket, Richmond Hill, King City & Stouffville
Greyfield Construction is based in Aurora and has completed basement underpinning projects throughout York Region. We are familiar with the permit requirements of each local municipality and the soil conditions common to the area, which allows us to plan and execute underpinning projects efficiently and without surprises.
Book a Foundation Assessment
Basement underpinning starts with a thorough assessment of your existing foundation, floor plan, and goals. Contact Greyfield Construction to schedule a consultation. We will walk through your options, explain the process in plain terms, and give you a realistic picture of what the project involves from start to finish.