Can I put new flooring over old flooring?

In most cases, yes - you can install new flooring over existing flooring, but success depends entirely on the condition of your current floor and what type of new flooring you're installing. This approach can save significant time and money on demolition, but only if done correctly.

The most important factor is that your existing floor must be structurally sound, level, and properly adhered. Any loose boards, squeaks, or uneven areas will telegraph through to your new floor and cause problems down the road. Walk around your current floor and check for any soft spots, creaking, or movement - these issues must be addressed first regardless of what you're installing on top.

Hardwood over existing floors works well when going over solid subfloor or existing hardwood that's in good condition. You'll need to ensure the combined floor thickness doesn't create issues with door clearances, transitions to other rooms, or appliance fit. In Ottawa's older homes, particularly those heritage properties in the Glebe or Centretown, you may discover beautiful original hardwood underneath that's worth refinishing instead of covering.

Luxury vinyl plank (LVP) and laminate are the most forgiving options for installation over existing floors. They can go over most surfaces including tile, hardwood, or existing vinyl, as long as the surface is smooth and level. Any height variations greater than 3/16" over 10 feet will need to be addressed with floor leveling compound.

Tile installation over existing floors is trickier and depends heavily on the substrate. You can tile over existing tile if it's well-bonded, but never over vinyl or carpet. The existing floor must be able to handle the additional weight and provide proper adhesion. In Ottawa's climate with significant freeze-thaw cycles, any movement in the substrate will crack new tile.

What you absolutely cannot do is install new flooring over carpet, loose or damaged existing floors, or surfaces that aren't clean and level. Also consider that adding floor height affects door swings, appliances, and transitions - in Ottawa's older homes with lower ceiling heights, this can be particularly problematic.

Professional assessment is recommended if you're unsure about the condition of your existing floor or if you're dealing with potential asbestos in older flooring materials (common in Ottawa homes built before 1980). A flooring contractor can evaluate whether your existing floor provides adequate support and identify any prep work needed.

Before starting, check if your project requires permits through the City of Ottawa - most flooring replacements don't, but structural modifications might.