Quick Answer
Most GTA condos require board approval before you replace carpet with hardwood, plus an acoustic underlay that meets a minimum impact-sound rating set in your declaration, rules, or alteration agreement (commonly an IIC/STC of 50 or higher, sometimes 60+). You'll typically submit a flooring sample, the underlay's lab-tested rating, a contractor's certificate of insurance, and a signed alteration agreement before any work starts. Rules vary by building, so always confirm the exact threshold and paperwork with your property manager first.
Yes, you almost always need board approval and an acoustic underlay
In nearly every GTA condo, swapping carpet for hardwood is a regulated alteration, not a free choice. Carpet naturally absorbs footstep noise, so when you go to a hard surface you must replace that lost sound control with an engineered acoustic underlay. Your condo's declaration, rules, and standard alteration agreement spell out the minimum sound rating and the approval steps, and the board can refuse or reverse non-compliant work. Start by emailing your property manager for the building's flooring policy and alteration application before you buy materials or book a contractor. Expect to provide the flooring type, the underlay's lab-tested acoustic rating, your contractor's licence and certificate of insurance naming the corporation as additional insured, and a signed undertaking accepting responsibility for noise complaints. Some buildings also require a deposit, restricted work hours, and elevator booking with protective padding. Skipping approval is the most common and costly mistake we see across Toronto, Mississauga, Vaughan, and Markham. We handle this paperwork as part of every condo flooring project we take on.
Understand IIC and STC ratings and the number your building requires
The two ratings that govern condo flooring are IIC and STC. IIC (Impact Insulation Class) measures how well an assembly blocks impact noise like footsteps, dropped objects, and dog claws, which is the main concern under hardwood. STC (Sound Transmission Class) measures airborne noise such as voices and music. Higher numbers mean better isolation. The Ontario Building Code sets a baseline for sound control between units, and many GTA condo declarations require a finished floor assembly meeting roughly IIC 50 to 55, with newer or higher-end buildings demanding 60 or more. The critical detail is that the rating applies to the whole assembly, including the concrete slab, underlay, and flooring, not the underlay alone, so you need an underlay tested in a comparable assembly. Ask the manufacturer for a lab report, not a marketing sheet. Cork, rubber, and engineered foam underlays each perform differently, and thickness alone does not guarantee compliance. We match the underlay's tested rating to your building's required number and keep the documentation on file for the board.
Documents, samples, and the approval timeline to plan for
Plan for a paper-heavy approval before any demolition. A typical GTA condo alteration package includes a completed alteration or modification application, a flooring sample or specification sheet, the underlay's acoustic test report showing the assembly IIC and STC, your contractor's WSIB clearance and certificate of insurance with the condo corporation named as additional insured, and a signed agreement accepting liability for future noise issues. Many boards also want a refundable deposit and proof of a licensed installer. Review cycles vary widely: some managers approve within a week, while boards that meet monthly can take four to six weeks, so apply early. Building rules usually restrict work to weekday business hours, require elevator booking and floor protection, and limit dust and debris in common areas. Budget realistically too: condo flooring projects in the GTA generally run from about $3,000 to $15,000 depending on square footage, material, and access, and that is an estimate only. We give you a real quote after a site visit, and HST is extra. Leo Constra manages the full submission so approval does not stall your schedule.
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