A finished basement in Burlington can mean a simple rec room at $60,000 or a full second living floor at $250,000. Two neighbours can both say “we finished the basement” and be describing completely different projects. This guide lays out what basements actually cost in Burlington in 2026, what the City requires for permits, and how a basement apartment changes the picture.
Studio Kimi is a boutique interior design-build firm based in Oakville. We design and build renovations across Burlington, Mississauga and the GTA, so these numbers come from projects in this market rather than national averages. If you are starting to plan, our Burlington interior design page shows how we approach projects in the city.
The short answer
A finished basement in Burlington runs about $50 to $200 per square foot. Most lower levels are 1,000 to 1,500 square feet, and most projects land between $60,000 and $150,000. A large, fully finished basement with a bathroom, a bar and a guest bedroom can run $150,000 to $250,000 or more.
Burlington and Oakville share the same trades, the same material pricing and the same Building Code, so these ranges match our basement renovation guide for Oakville. What changes between the two cities is not the construction cost. It is the permit process and the rules around basement apartments, which we cover below.
What actually drives the cost
A basement starts as a low, blank, slightly awkward box. What you spend depends far more on what goes into that box than on the square footage alone.
- The condition of the box. Moisture, low ceilings and old mechanicals are the quiet budget items. Waterproofing, insulation upgrades or underpinning to gain ceiling height can add tens of thousands before a single finish goes in.
- Plumbing. A bathroom, wet bar or kitchenette means drain lines, venting and sometimes cutting the concrete slab. Where the plumbing lands often decides the whole layout.
- Bedrooms. A legal bedroom needs an egress window, typically $4,000 to $8,000 per window installed.
- Finish level. Vinyl plank and pot lights price very differently than custom millwork and a fully tiled bathroom.
Cost ranges by finish level
These tiers assume a dry, structurally sound basement of roughly 1,000 to 1,500 square feet.
Simple and functional: $50 to $90 per square foot
Drywall, pot lights, durable vinyl plank flooring, an open rec room and storage, with no new plumbing. A 1,000 square foot basement at this level lands between $50,000 and $90,000.
Mid-range: $90 to $140 per square foot
The tier we build most often. A full bathroom, a proper media or play area, better flooring and lighting, and some built-in storage. A 1,000 square foot basement here runs $90,000 to $140,000.
High-end and full lower levels: $140 to $200 per square foot
Custom millwork, a bar or kitchenette, a gym, a bedroom with ensuite, upgraded HVAC and sound insulation. This is where the $150,000 to $250,000 projects live.
Individual features carry their own weight regardless of tier. A full bathroom typically adds $15,000 to $30,000 depending on finishes, and a built-in bar can add $20,000 to $50,000 on its own.
Building permits in Burlington
Finishing a basement in Burlington requires a building permit once you are adding rooms, a bathroom or changing what sits behind the walls. The City publishes a Basement Finish permit checklist, and incomplete applications are not accepted for processing. A complete application includes:
- An approved zoning certificate with the approved drawings
- The provincial application for a permit to construct
- Two complete sets of scaled construction drawings showing room dimensions and uses, construction details, plumbing fixtures, smoke alarm locations, heating supply and return locations, and a bathroom exhaust fan
- Designer qualifications and BCIN numbers on the drawings
Burlington calculates the permit fee by formula: a service index for the type of work, multiplied by the floor area in square metres. Under the current fee schedule (Schedule A to By-law 18-2025), residential interior alterations are $8.25 per square metre, with a minimum permit fee of $377. In practice, a 1,000 square foot basement works out to roughly $770 in permit fees and a 1,500 square foot basement to about $1,150. A new basement walkout carries its own flat fee of $377.
We prepare the drawings and handle the submission as part of our design work, so the permit stage does not fall on you.
Adding a basement apartment in Burlington
Burlington allows up to three additional residential units (ARUs) on a residential property, and a basement apartment is one of the accepted forms. The unit must be self-contained, with its own kitchen, bathroom and sleeping area, and it needs a building permit and zoning clearance of its own. Parking is lighter than most people expect: the first additional unit does not require an extra parking space, while a second or third unit needs one space each.
On budget, a legal basement apartment sits at the top of the ranges above. Fire separation, sound control, a safe exit and a full kitchen push the work into high-end territory even when the finishes are modest, and a separate entrance or walkout adds excavation on top. The math can still work well once rental income enters the picture, but go in with the full number, not the finishes-only number.
How design-build affects your budget
In a traditional renovation you hire a designer, take the finished drawings to two or three contractors, and hope the quotes match the concept. Design-build puts both under one roof: the people pricing the work are the people who drew it. We explain the model in plain terms in What is design-build?
For basements this matters more than for most rooms, because so much of the cost hides in existing conditions. When the builder is in the room during design, the awkward duct, the low beam and the plumbing stack get solved on paper instead of on site. The practical result is a price attached to drawings before construction starts, and far fewer change orders after. Our guide to design-build costs in Ontario breaks down how the fees work.
What timeline to expect
From our projects, a realistic Burlington basement schedule looks like this: four to six weeks for design and drawings, a few weeks for the City’s permit review depending on the queue and the completeness of the application, then eight to twelve weeks of construction for a typical basement. A lower level with a bathroom, bar and bedroom sits at the longer end. Plan for four to six months from first meeting to furniture, and treat anyone promising much less with some caution.
Frequently asked questions
How much does it cost to finish a basement in Burlington?
About $50 to $200 per square foot. Most projects of 1,000 to 1,500 square feet land between $60,000 and $150,000, while a large, fully finished basement with a bar, bathroom and bedroom can run $150,000 to $250,000 or more.
Do I need a permit to finish a basement in Burlington?
Yes, once you are adding rooms, a bathroom or changing structure. The City of Burlington requires a complete application with two sets of drawings, and the fee for residential interior alterations is $8.25 per square metre with a $377 minimum, so a typical basement runs roughly $770 to $1,150 in permit fees. We prepare and submit everything as part of the design work.
Can I add a legal basement apartment in Burlington?
Yes. Burlington permits up to three additional residential units per property, and basement apartments qualify. The unit must be self-contained with its own kitchen, bathroom and sleeping area, and it needs its own building permit and zoning clearance. The first additional unit requires no extra parking space.
How long does a basement renovation take?
Construction itself typically takes eight to twelve weeks. With design, drawings and permit review included, plan for four to six months from first meeting to a finished space.
Ready to start?
Every basement is different, and the only number that matters is the one for your home. If you are thinking about your lower level in Burlington, get in touch and we will give you an honest range after we have seen the space.