Start with how you want to use the space: family room, home office, storage, bathroom or a combination. Note what needs to stay accessible, including mechanical equipment, and separate essential requirements from optional features. A clear brief makes it easier to compare layouts and quotations.

Yes. Tell your contractor about past leaks, damp patches, musty smells or water after heavy rain before choosing finishes. Investigate the cause rather than covering the symptoms with new walls or flooring. Any remedial work should be considered in the renovation scope before finishes are installed.

The answer depends on the proposed work. Discuss the complete scope with your local municipal building department before construction, particularly where structural changes, plumbing or a new dwelling unit are involved. Ontario’s building permit guide explains the approval process; it is not a project-specific permit decision.

No. Finishing space for your household is different from creating a separate dwelling unit. A second unit requires a building permit and a review of the applicable requirements. Do not assume that adding a kitchen or separate entrance makes a basement an approved apartment. See Ontario’s guide to adding a second unit and confirm the property-specific requirements with your municipality.

Map the stairs, beams, ducts, pipes and equipment before settling on rooms and furniture. Consider everyday routes as well as access for maintenance and future replacement. Have proposed rooms and any ceiling changes assessed against the requirements that apply to the project; a concept layout alone does not establish compliance.

Compare the same scope, not just the total. Look for clear descriptions of demolition, preparation, partitions, insulation, electrical and plumbing work, finishes, waste removal and exclusions. Ask how allowances, unforeseen conditions and changes will be documented, and clarify who is responsible for required drawings, applications and inspections.