Quick Answer
You cannot alter anything structural or part of the building's common elements without engineer sign-off and condo board (or property management) approval. That includes load-bearing walls, concrete slabs, plumbing risers and stacks, shared HVAC, exterior windows and doors, balconies, and the building envelope. Moving plumbing, adding heavy loads, or cutting into structure typically needs a structural or mechanical engineer's letter plus a building permit, and almost every reno needs board approval and proof of insurance before work starts.
Structural elements: load-bearing walls, slabs, and beams
You cannot remove or modify a load-bearing wall, concrete column, beam, or floor slab in a GTA condo without a structural engineer's stamped drawings and, in most cases, a City building permit plus board approval. High-rise condos are typically concrete-frame buildings, so many interior partitions are non-structural and can be reconfigured, but you can rarely tell by looking. An engineer must review the original architectural and structural drawings (usually obtained through property management) to confirm what is safe to touch. Cutting into a slab to relocate plumbing, drilling for new openings, or adding heavy finishes like stone or large tile assemblies can all exceed the floor's designed load and require engineering review. Never let a contractor open a wall on assumption. At Leo Constra, we coordinate the engineer's assessment before demolition so you know exactly what is movable, what needs a permit, and what the board will require. Getting this wrong can mean stop-work orders, costly restoration, and liability for any damage to units below or beside yours.
Plumbing stacks, risers, and shared mechanical systems
You cannot relocate or tie into the building's main plumbing stacks, risers, sprinkler lines, or shared HVAC without engineering input and board approval, because those systems serve every unit in the column. Inside your suite you can usually move fixtures a modest distance, but the further you pull a sink, toilet, or shower from the existing stack, the more drain slope you need, and in a concrete building you often cannot bury new drains in the slab. That is the single biggest constraint on condo kitchen and bathroom layouts. Sprinkler heads, in-suite fan-coil units, make-up air, and exhaust ducting are typically common elements or building-controlled, so altering them requires a licensed mechanical contractor and frequently a mechanical engineer's letter. Boards almost always require any plumbing or sprinkler work to be done by approved trades with a shut-down coordinated through management. A realistic condo renovation starts from about $15,000, but plumbing moves and engineering letters add cost. We design layouts around the existing stack first, then price relocations honestly. Final numbers come after a site visit; HST is extra and these figures are estimates.
Common elements: windows, doors, balconies, and the building envelope
You cannot change anything classified as a common element or exclusive-use common element without the condo corporation's written consent, usually through a Section 98 agreement under Ontario's Condominium Act. That category typically includes exterior windows and glazing, balcony slabs and railings, the suite entry door, the building facade, shared corridors, and the parts of walls, ceilings, and floors that form the structure or fire separation. Even changes that look interior, such as altering ceiling assemblies, penetrating demising walls, or modifying balcony surfaces, can touch common elements or fire ratings. Flooring is a common pinch point: many GTA boards mandate minimum acoustic underlay ratings to protect neighbours from noise, so your flooring choice may be restricted by the declaration. Hardwood, luxury vinyl, or tile installs often must meet a specified IIC or STC rating. Confirm your building's rules and Section 98 process with property management before you commit to materials or a layout. We review your status certificate and declaration up front so the design respects what the corporation owns and controls.
Board approval, permits, and insurance: what every condo reno needs
Before any meaningful condo renovation in the GTA, you almost always need three things in hand: written board or management approval, the correct City building permit where work is regulated, and proof of contractor insurance and WSIB coverage. Most boards require a renovation application with scope, drawings, trade licences, certificates of insurance naming the corporation, and a Section 98 agreement for anything affecting common elements. Permits are typically triggered by structural changes, plumbing relocation, new electrical circuits, and HVAC work, while like-for-like cosmetic updates often are not, though you should confirm with your municipality because rules differ across Toronto, Mississauga, Vaughan, Markham, and the rest of the region. Buildings also impose practical limits: approved working hours, elevator and loading-dock booking, dust and noise protocols, and waste-removal rules. Skipping board approval can void your ability to proceed and expose you to fines or forced restoration. Leo Constra is licensed, insured, and WSIB-cleared, with 20-plus years in GTA condos and a two-year written workmanship warranty. We assemble the approval package, coordinate the engineer and permit, and schedule work to your building's rules so the project clears the board the first time.
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