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Signs include drafts, fogging or condensation between the panes, rotting or damaged frames, windows that stick or won't lock, noticeable outside noise, and rooms that feel hot or cold near the glass. Sometimes repairs such as new weatherstripping or hardware can help; a contractor can tell you whether replacement is the better value.

Costs depend on the number, size and style of windows, frame material, glass package, custom shapes, and whether it's an insert or full-frame installation with exterior trim work. Because every home and scope is different, the only reliable number is a written quote. Ask two or three local businesses to visit and quote the same scope so you can compare like for like.

Energy performance depends on the whole unit — the glass (double or triple pane, low-E coatings, gas fills), the frame material, and the quality of installation. ENERGY STAR certified products are tested for Canadian climate zones. Ask contractors for each product's ratings so you can compare objectively.

Lifespan depends on the frame material, product quality, installation, exposure and maintenance. Keeping seals, caulking and weatherstripping in good condition helps windows perform longer. Check the manufacturer's warranty for a sense of expected durability.

Door replacement costs depend on the material (steel, fibreglass or wood), glass inserts, sidelights, hardware, custom sizing and whether the frame needs repair. Because every home and scope is different, the only reliable number is a written quote. Ask two or three local businesses to visit and quote the same scope so you can compare like for like.

Ask which brands they install, whether they use their own trained installers, how they insulate and seal around frames, and what both the product and installation warranties cover. Request product specifications and energy ratings in writing, and confirm how they handle exterior trim and interior finishing.