# Do I need a permit to finish a basement in Hamilton?

> Finishing or partly finishing a basement in Hamilton needs a building permit: what counts, the $4.06 per m² fee, walkouts, underpinning and basement units.

- Canonical HTML: https://www.jdtconstruction.ca/guides/basement-permit/
- Section: Home > Guides > Finishing a basement
- Business: JDT Construction Inc., Hamilton, ON, Canada (serves Hamilton)
- Phone: (905) 818-0106 | Email: johnny@jdtconstruction.ca
- Page updated: 2026-11-05

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Guides

Yes. The City of Hamilton lists finishing or partly finishing a basement as work that needs a building permit, along with new walls, drywall and insulation, new plumbing, a walkout and underpinning to deepen it. Flooring, cabinets and paint alone do not. The fee is $4.06 a square metre, $291 at least. JDT Construction plans basements around the permit from the first drawing.

## Which basement work needs a permit?

Most of it. These are from the City's own list of projects that need a building permit [(City of Hamilton, Building Permit, read November 5, 2026)](https://www.hamilton.ca/build-invest-grow/construction-renovation/residential-building-renovation/building-permit):

**Basement work and the City of Hamilton building permit**

| Work | Permit? |
| --- | --- |
| Finishing or partially finishing a basement | Yes |
| Installing or replacing drywall and insulation | Yes |
| New rooms, or moving rooms | Yes |
| Adding or removing walls, load bearing or not | Yes |
| New or moved plumbing, a backwater valve, a sump pump, an interior weeping tile system | Yes |
| A walkout basement | Yes |
| Underpinning to make a full basement | Yes |
| Waterproofing foundation walls | Yes |
| Flooring, cabinetry, painting, replacing fixtures in the same place | No |

## What does the permit cost?

$4.06 a square metre to finish a basement, and $6.58 for a new basement or cold cellar, with a $291 minimum [(City of Hamilton, Building Permit Fees, read November 5, 2026)](https://www.hamilton.ca/build-invest-grow/construction-renovation/residential-building-renovation/building-permit-fees). Finishing 80 m² comes to $325. A basement that becomes its own apartment is charged differently, a flat $515: the [permit fee calculator](https://www.jdtconstruction.ca/guides/permit-fee-calculator/) has both.

## When does a basement become an ADU?

When it is a separate, self-contained home with its own kitchen and bathroom. That is an additional dwelling unit, with fire separations, exits, smoke alarms and a furnace shut-off the City lists [(City of Hamilton, Additional Dwelling Units, read November 5, 2026)](https://www.hamilton.ca/build-invest-grow/construction-renovation/residential-building-renovation/additional-dwelling-units). [Making a basement apartment legal](https://www.jdtconstruction.ca/guides/legal-basement-apartment/) covers it, and [the backwater valve grant](https://www.jdtconstruction.ca/guides/backwater-valve/) covers protecting the basement from sewer backup.

## What if the basement was finished without a permit?

The City can order a permit after the fact, and opening walls for the inspector costs more than building it right; [building without a permit](https://www.jdtconstruction.ca/guides/building-without-a-permit/) lists what the City can do. Taking out a wall down there has its own page: [removing a wall](https://www.jdtconstruction.ca/guides/removing-a-wall/).

## How does JDT run a basement?

Framing, insulation, drywall, a bathroom and the finishes, drawn first and priced in one written proposal, with the work paid in stages; [renovations](https://www.jdtconstruction.ca/builds/renovations/) has the rest. Under JDT Construction Inc.'s agreement the homeowner applies for the permit and pays the City's fees; [who applies for a building permit](https://www.jdtconstruction.ca/guides/building-permits/) explains how that works.

Published by JDT Construction Inc., Hamilton. Updated November 5, 2026. Free to share and quote, with a link back to this page.

## Finishing a basement?

Send photos of the basement as it is. JDT draws the plan and prices it in one written proposal.

[Call (905) 818-0106](tel:+19058180106) [Request a quote](https://www.jdtconstruction.ca/request/?problem=renovation)

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JDT Construction Inc. Call (905) 818-0106. Full site: https://www.jdtconstruction.ca/