Basement Renovations in Hamilton
From Kirkendall, Crown Point and Gibson in the lower city to Westdale, the Mountain, Dundas and Stoney Creek, we finish Hamilton basements and build additional dwelling units.
A Grant Window Open Until 2027
For eligible owners, Hamilton will pay part of the cost of building a basement unit. Its Additional Dwelling Unit and Multi-Plex Housing Incentive Program grants 70% of eligible construction costs, to a maximum of $40,000 per unit, for units whose building permit was issued on or after October 9, 2025. The site must be inside the Housing for Hamilton Community Improvement Project Area, outside the Roxborough sub-area, and the occupancy permit must be issued by August 4, 2027 at the latest.
The grant pays in two parts: an advance of up to $8,000 once the permit is issued and a construction estimate is approved, and the balance after occupancy, with an ESA Certificate of Acceptance and invoices. Eligible costs are the building work the permit requires, such as materials, labour, HVAC and plumbing. Appliances, decorative items and the cost of permit drawings are not covered, which is why our Hamilton quotes separate the two.
The houses themselves are old. In the 2021 census, 32.8% of Hamilton homes were built in 1960 or earlier and 60.9% before 1981, so many basements have low ceilings, older foundations and drains that need attention. Hamilton has allowed additional dwelling units since May 2021, some zones permit up to four units, and the City's dedicated ADU team reviews permits for houses with up to two internal units and one detached unit.
- Licensed & insured contractors
- Transparent, itemized pricing
- Permits & approvals handled for you
- On-time delivery, every project
Hamilton Basement Projects
The basement projects Hamilton owners most often ask us to price.
- Grant-Eligible Basement Units. Units built under permit and documented for the City incentive, with eligible costs itemized.
- Older Basement Conversions. Lowering, waterproofing and rewiring pre-1961 basements so they can hold a legal unit.
- Licensed Rental Units. Units in Wards 1, 8 and parts of 14 built to pass property standards and fire inspections.
- Family Basement Finishing. Rec rooms, offices and guest rooms for homes on the Mountain and in the suburbs.
- Protective Plumbing. Backwater valves, sump pumps and downspout disconnection for homes built before 2012.
- Separate Entrances. Side and rear stairwells to a basement unit, designed with drainage in mind.
Hamilton Rules in Order
The approvals and programs a Hamilton basement unit runs into.
Up to Four Units
In some zones, an internal unit can bring a property to four dwelling units in total.
ADU Permit Fee
A flat $515 for a unit in an existing house. Finishing a basement is $4.06 per square metre, with a $291 minimum.
Municipal Address
Under the Municipal Addressing By-law, each unit needs a municipal address and a posted unit number.
Rental Licensing
Made permanent in December 2025 for Wards 1, 8 and parts of 14, covering buildings with five or fewer units.
Protective Plumbing Timing
The $2,000 grant is not available while you are adding a secondary dwelling unit, so sequence the work carefully.
Heritage Districts
Hamilton has seven heritage conservation districts, where exterior changes such as a new entrance need a heritage permit.
Hamilton Basement Costs
A Hamilton basement finish with us starts at $55 per square foot, and an additional dwelling unit at $80 per square foot. Standard finishes usually cost $50,000 to $90,000. Legal units usually come in at $80,000 to $175,000, which covers the kitchen, fire separation, linked alarms, a compliant exit and the permit, inspection and ESA steps.
Hamilton's incentive can change the math: at 70% of eligible costs, a unit could recover up to $40,000 of the building work. Older lower-city basements cost more to convert because of height and drainage. Those items are listed separately in our fixed, itemized quote, so you can see which costs count toward the grant.
Hamilton Neighbourhoods We Serve
We finish basements across Hamilton, below and above the Escarpment.
Our Simple 5-Step Process
Here is how a Hamilton basement project runs, from first call to final inspection.
Reach Out
Call us or fill out our quick form to tell us about your basement.
Free Consultation
We visit your home, measure the space and talk through layout, finishes, budget and timeline.
Detailed Estimate
You receive a transparent, itemized estimate within 2 to 3 business days.
Review & Refine
We walk through the proposal together until you are fully confident.
Sign & Start
We lock in your start date and handle scheduling, permits and coordination.
Recent Basement Renovations
Basements we have built for homeowners across the GTA and Golden Horseshoe.
