Commercial Interior Fit-Out Cost in the GTA: What Actually Drives the Number

Two interior fit-outs on similar floor plates can price a long way apart, and neither estimator has done anything wrong. Square footage is the least informative input anyone brings to a fit-out conversation. What sets the number is how much partition goes in, how far the mechanical and electrical distribution has to move, what finish is going back, who owns the building rules, and whether the floor is empty or still occupied.

This is educational guidance from a commercial general contractor that handles framing, drywall and ceilings and coordinates licensed mechanical, electrical and sprinkler trades under one project manager. It covers commercial interior fit-out work across Toronto, Mississauga and the wider GTA. It is not a price list. No honest contractor quotes a rate before drawings, the landlord's rules and a site walk.

Partitions and the envelope of the layout

The partition package is the first real cost signal in a set of fit-out drawings, and it is the one you can read before any trade has been engaged.

Count the linear metres of new wall, then look at what kind of wall it is. Steel stud density changes with height, spacing and the load a wall has to carry. Walls that run to deck cost more than walls that stop at the ceiling grid, because they involve deflection detailing, fire-stopping at the deck flutes, insulation over the full height and coordination with everything already running through that plenum. Rated corridor assemblies and acoustic partitions between boardrooms and demising lines carry their own detailing, inspection and sequencing. Glazed office fronts move the work from a drywall problem to a lead-time and tolerance problem — framing has to be dead straight and finished before the glass shows up.

A dense layout of small offices on a floor plate costs more than an open plan of the same area even with identical finishes, simply because there is more wall. That is drywall and framing volume, and the drivers behind it are broken down in commercial drywall and framing cost in the GTA.

MEP coordination

The second driver is how far the mechanical, electrical, plumbing and sprinkler distribution has to travel to serve the new layout.

Reusing the existing distribution where the new walls roughly follow the old ones is the cheap case. Rotating the layout ninety degrees means new ductwork runs, relocated diffusers and returns, re-zoned controls, new circuits and device locations, data pathways, re-headed sprinklers to suit the new ceiling grid, and often plumbing runs for a new kitchenette or barrier-free washroom. Every one of those is an inspection item as well as a labour item.

Base-building tie-ins are where schedules get decided. A shutdown on a live riser has to be booked with property management, usually outside business hours, with notice to other tenants. Fire alarm verification and sprinkler work often need their own windows. On our projects Sofisa coordinates the licensed trades under one project manager while handling partitions and ceilings, so the rough-in, board and inspection sequence is held by one party rather than negotiated between four.

Finishes and millwork

After partitions, finish level is usually the largest rebuild variable.

Painted drywall to a standard commercial finish, T-bar ceilings and broadloom or standard LVT is the baseline. Move up to taped Level 5 in raking light, drywall ceilings and bulkheads instead of grid, feature ceilings, tile, specialty coatings, solid-core doors with commercial hardware and closers, reception casework, boardroom credenzas and custom millwork, and the same floor plate becomes a different contract.

Millwork also carries a lead-time cost that does not show up in the unit rate. Custom casework is drawn, shop-approved, fabricated and delivered on a schedule of its own, and a fit-out that is otherwise finished can sit waiting on it. Fixing the finish level early, in writing, removes more bid noise than any other single decision.

Landlord rules and TI manuals

Landlord requirements are scope, not paperwork, and they are priced as scope.

A tenant improvement manual typically sets out approved contractor and trade lists, insurance limits and additional-insured wording, WSIB clearance requirements, hoarding and signage standards, protection requirements for lobbies and elevator cabs, elevator and loading dock booking procedures, permitted noise windows, hot-work permit procedures, after-hours security and fire-watch arrangements, and waste removal rules. Some buildings also require base-building trades for anything touching life safety or the building automation system, which removes competitive pricing on those lines entirely.

None of that is optional and all of it takes labour and supervision hours. Send the TI manual with the drawings and the number you get back will be closer to the number you pay.

After-hours and occupied work

A vacant floor is priced on production. A live floor is priced on containment and interruption.

Occupied fit-outs carry hoarding and dust barriers, negative air where required, protected corridors and routes back to the dock, maintained egress, daily clean-down so the tenant's Monday looks like their Friday, and frequently night or weekend labour with premium rates and shorter productive shifts. Crews spend part of every shift setting up and tearing down protection instead of building, so productivity per hour falls even with the same people on site. Phasing a floor into zones adds mobilisations, re-protection and handbacks at each boundary.

The premium is real and belongs in the scope conversation rather than in a change order. Our longer treatment of that sits in occupied commercial renovation in the GTA.

Typical scope bands — relative effort only

These are not dollar rates and they are not per-square-foot bands. They describe relative effort between scopes, and two areas of identical size can sit at opposite ends of this list depending on partition density, finish level and access.

• Vacant grade or plaza suite, light layout change, standard finishes. Baseline relative effort — direct access, continuous loading, minimal MEP movement.
• Vacant office floor, new partitions throughout, standard ceilings and finishes, grade or dock access. Modestly above baseline, driven by rebuild volume rather than logistics.
• Tower floor with booked freight, full partition reset, standard finishes. Well above baseline on logistics alone. The daily freight ceiling, not crew size, sets duration.
• Occupied or after-hours phased fit-out. Containment and interruption dominate the number regardless of how modest the finished layout looks.
• High-finish fit-out — rated corridors, Level 5, glazed fronts, custom millwork, feature ceilings. Above baseline on rebuild effort whatever the access is like.
• Shell or cold-shell starting point. That is interior build-out rather than fit-out, and it carries a materially larger relative effort because base-building systems, washrooms and distribution do not exist yet.

If a bid does not say which of these it assumed, it is not comparable to the one next to it. The same principle applies to broader rebuild work, covered in commercial renovation cost in the GTA. Where the money is coming from a landlord allowance rather than your own capital, the mechanics of that are the subject of commercial tenant fit-out cost in the GTA.

What actually sets the timeline

Duration on a fit-out is rarely set by how fast a crew can build.

1. Landlord approvals. Drawings, contractor approval, insurance certificates and hoarding plans all clear before mobilisation.
2. Permits and inspections. Building permit, plus framing, above-ceiling, fire alarm and sprinkler inspections as hold points in the sequence.
3. Long-lead items. Custom millwork, glazed fronts, specialty lighting and tenant equipment are often the true critical path.
4. Freight and dock windows. In a tower, the booked window is a hard daily ceiling on both demolition out and material in.
5. MEP rough-in before board. Nothing gets closed up until the rough-in is inspected, so a delayed inspection stops the drywall crew, not just the trade that caused it.

Schedule detail specific to office work is set out in office fit-out timelines in the GTA. For Toronto office plates specifically — tower freight rules, landlord turnover condition and TI allowance — see office fit-out cost in Toronto.

How Sofisa quotes

Send us the following so we can prepare a fixed-scope number and the assumptions written down beside it:

• Drawings, or a marked-up plan if the design is not finished.
• The turnover condition — what is there now, and what is staying.
• The landlord's TI rules, insurance requirements and permitted access hours.
• Occupied or vacant, and whether phasing is required.
• Target finish level, including any glazing or millwork.
• Your target completion date.
• A designated substances survey if a strip-out precedes the fit-out.

we handle framing, drywall and ceilings and coordinate the licensed mechanical, electrical and sprinkler trades under one project manager, so the sequence and the hold points sit with one contractor. We quote fit-outs in Toronto, Mississauga and across the GTA.

Request a Quote: contact us or call (647) 963-4310.

Who you are dealing with

Sofisa Group Inc. is a WSIB-cleared and insured Ontario commercial general contractor in Mississauga, ON. We carry insurance documentation, and certificates go out with the quote package so landlord approval is not the thing holding up your start date.