Basement Renovation in Ottawa — Turn Your Unused Space Into Your Best Room
Most
Ottawa homes have a basement that's doing less than it could. Whether it's an unfinished shell, a half-finished relic from the 1990s, or a dark utility room that nobody wants to spend time in,
Trehane Renovation Inc. can change that. We've been finishing and remodelling basements across Ottawa and its suburbs since 2004 — handling everything from framing and insulation through to electrical, drywall, flooring, and final finishes. One BBB-accredited contractor, no subcontractor juggling, no surprises on the invoice.
Elevate your living with functional spaces!
What a Basement Renovation with Trehane Includes
A finished basement adds usable square footage to your Ottawa home without the cost and disruption of a home addition. We start with a site visit to assess existing conditions: ceiling height, mechanical runs, the location of the drain stack, window wells, and any signs of moisture. Moisture is the one issue that can't be covered up — if there's a water problem, it needs to be resolved before any finishing happens. We identify it early and advise on the right course before a nail is driven.
A typical basement finishing project with us covers framing, insulation on exterior walls, vapour barrier, drywall, primed and painted, pot light installation, electrical for outlets and switches, flooring, doors, and trim. Specialty rooms are built to your requirements — a home office with built-in shelving, a bathroom rough-in, a recreational space, or a wet bar area. We manage the City of Ottawa building permit process for all projects that require one.
Our basement renovation scope typically includes:
- Framing and insulation (rigid foam on exterior walls, batt on interior partitions)
- Vapour barrier and drywall throughout
- Pot lights and electrical rough-in, coordinated with licensed electricians
- Plumbing rough-in for bathroom additions, coordinated with licensed plumbers
- Flooring — luxury vinyl plank, carpet, or tile
- Doors, trim, and finishing
- City of Ottawa building permit management
Ottawa Homeowners Who Benefit Most from a Basement Renovation
- Your home was built between 1980 and 2010 and the basement is still unfinished. This is the most common situation in Ottawa's suburbs. Nepean, Barrhaven, Kanata, and Orléans are full of homes where the main and upper floors have been updated but the basement was always next year's project. The space exists — it just needs to be put to work.
- You have a half-finished basement from a previous owner. Older amateur finishing work — thin drywall screwed directly to concrete, inadequate insulation, undersized electrical — often causes more problems than it solves over time. We remove it and do it properly.
- You need a home office that actually functions. Open-concept main floors are great for family life and poor for focused work. A finished basement with a proper home office — private, well-lit, with adequate electrical to support a real workstation — solves that without adding onto the house.
- You want to accommodate family without giving up your main living space. A finished basement with its own bathroom creates a self-contained area for a returning adult child, an aging parent, or a long-term guest — private enough for everyone involved.
- You're planning to sell and the basement is dragging the listing. An unfinished basement in a market where competing listings show finished lower levels is a negotiating point — rarely in the seller's favour. A proper finish before listing pays for itself.
How We Handle Basement Renovations in Ottawa
Ottawa's basement conditions are specific to the region. The city's soil composition — a mix of Leda clay, sand, and glacial till depending on the neighbourhood — means moisture behaviour varies significantly across the city. Homes in areas with clay-heavy soils, particularly in older sections of Nepean and along the Ottawa River, face more hydrostatic pressure against foundation walls than homes built on sandier ground further south. We assess this at the initial visit and factor it into the insulation and vapour barrier approach for your specific home.
The City of Ottawa requires building permits for basement finishing projects that involve electrical work, plumbing rough-in, or structural changes. We apply for and manage the permit process, coordinate the required inspections at framing, rough electrical, and rough plumbing stages, and ensure everything is properly closed out with the city before the project is considered complete. A basement finished without proper permits creates complications at resale — we make sure yours won't.
We've been building basements in Ottawa for over 20 years and know what the city's inspectors look for, what the local building code requires, and how to sequence a basement project so nothing needs to be opened back up after it's been closed.
Basement Renovations Across Ottawa and Surrounding Communities
We complete
basement renovations in Ottawa and throughout the surrounding region. From the established neighbourhoods closer to the urban core — Alta Vista, Carlington, Overbrook — to the suburban communities of
Nepean,
Barrhaven, Kanata,
Orléans,
Gloucester, and Manotick, we've worked across Ottawa's housing stock and understand what each area's construction era presents.
What Our Clients Say
"We were very pleased with the basement renovation done by Trehane Carpentry . The bathroom bedroom and living room area are awesome. The entire Team was very professional ,great in communicating next steps and always willing to answers any questions we had. The attention to detail and quality of work was excellant ! Stayed in budget and within the time line .
Awesome results and was stress free !" — Norma Barker
Let’s give you more room for your growing needs!
Frequently Asked Questions
How long does a basement renovation take in Ottawa?
A full basement finishing project typically takes 4 to 8 weeks depending on square footage and the number of rooms. Adding a bathroom extends that timeline. We provide a specific schedule in the written quote so you know what to expect before committing.
What does a basement renovation cost in Ottawa?
Cost depends on the size of the space, the number of rooms, the finishing materials, and whether a bathroom is being added. The most accurate way to get a number is a free in-home estimate. Call us at (613) 913-9168 and we'll schedule a visit at no charge.
My basement has moisture. Should I renovate it anyway?
Not without addressing the moisture first. Finishing over a damp basement traps moisture in the wall assembly, which leads to mould and structural damage over time. We identify moisture sources at the initial visit — whether it's surface seepage, foundation cracks, or grading issues outside — and advise on the right solution before any finishing work begins.
Ready to Finish Your Ottawa Basement the Right Way?
Trehane Renovation Inc. has been transforming Ottawa basements since 2004. We bring every trade — framing, electrical, plumbing, tile, and finishing — under one roof, manage the City of Ottawa permit process, and deliver a finished space you'll actually use. BBB-accredited, locally owned, free in-home estimates.
