The new deck looks straightforward on paper because the old one is already in roughly the right place. "Roughly" is doing some heavy lifting.
Removal is the moment to stop inheriting decisions that no longer suit the house. It is also the moment when a back door can suddenly open onto nothing.
Describe removal and replacement together
Oakville's application guidance includes demolition as well as construction. Ask Building Services what approvals apply to your specific removal and rebuild. Do not assume a permit for the new deck automatically answers every question about dismantling the old one.
Show whether the size, height, stairs, or attachment will change. Calling it a "replacement" does not make a larger or differently supported structure the same project.
Decide what happens to the house
- How the elevated door will be secured while the deck is absent.
- Whether another safe household exit and garden route remain available.
- Who will weatherproof the wall after the old ledger is removed.
- How exposed damage will be documented and priced before rebuilding.
- Where dismantled material can be carried and collected without blocking access.
These details are small on a quotation. They are large when it rains halfway through the job.
Existing footings need evidence
A footing that has stood beneath the old deck is not automatically suitable for a new layout. Its location, condition, dimensions, bearing, and proposed loads all matter. Concealed information may need investigation before reuse can be agreed.
Simpson Strong-Tie's deck guide separates retrofit from replacement and highlights the connections beneath the surface. Use that distinction to ask what is being assessed, rather than accepting "the posts look fine" as the entire reuse plan.
Keep the first scope honest
Ask the quote to distinguish removal, disposal, wall repairs, retained supports, and new construction. If hidden conditions prevent a fixed repair price, agree how findings and changes will be approved.
The best catch to discover early is that keeping one old component would force the whole new deck into an awkward shape. Sometimes starting again buys a better doorway, a simpler stair, and fewer inherited compromises.