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A kitchen renovation goes wrong most often when hidden conditions, building systems, approvals, or contract responsibilities are left until after work begins. This practical checklist covers 13 preventable mistakes—from skipping an inspection to choosing an undersized exhaust hood—so you can set a realistic scope, budget, sequence, and accountability before demolition. The number 13 is an editorial checklist, not a statistical ranking, and permit and trade requirements vary by location and project scope.
Use the checklist before you sign or demolish
Work through these items in order. First establish what exists, then draw the proposed layout and system changes, confirm local approvals and qualified trades, and only then finalize the written price and schedule. Keep dated photos, measurements, plans, product specifications, approvals, invoices, and change orders in one project file. If a condition is uncertain, have the appropriate designer, engineer, electrician, plumber, gasfitter, or HVAC professional investigate it rather than pricing a guess.
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1. Starting demolition before inspecting the room
Cabinets and drywall can hide moisture damage, deteriorated framing, old supply or drain piping, unsafe wiring, and a service that cannot support modern appliances. Demolition can also destroy evidence of how the existing systems were routed. Before removing anything, inspect under sinks and dishwashers, around windows and exterior walls, at the floor transitions, in the ceiling below, and inside the electrical panel. Look for staining, swelling, musty odors, corrosion, soft framing, overloaded circuits, and improvised connections.
Photograph every wall, floor, ceiling, appliance connection, shutoff, outlet, and service label. Ask qualified trades to test suspect conditions and identify what must be replaced rather than assuming new cabinets will conceal the problem. A discovery allowance in the budget is safer than a low bid based on inaccessible conditions.
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2. Finalizing a layout without verified dimensions
Measure the room after removing only items that do not affect the permanent geometry. Record wall-to-wall dimensions at several heights, ceiling height, soffits, beams, window and door openings, trim, radiator or register locations, and the positions and sizes of plumbing, gas, electrical, and ventilation routes. Note which measurements are finished-surface dimensions and which are framing dimensions. A few millimetres can determine whether a tall cabinet clears a casing or whether an appliance door opens.
Draw an existing plan and a proposed plan with dimensions, appliance clearances, outlet locations, lighting, plumbing, mechanical work, and demolition notes. The City of Elk Grove’s kitchen-remodel guidance illustrates the level of detail some jurisdictions request: existing and proposed plans showing electrical, plumbing, and mechanical changes, with engineered documentation for structural alterations. Your municipality may require a different format, but undocumented dimensions make accurate pricing and approvals difficult.
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A photogenic elevation can still produce a frustrating kitchen. Test the measured plan with the refrigerator, range, oven, dishwasher, sink, waste bins, and primary prep surface in their actual positions. Check that doors and drawers can open without blocking a walkway, that two people can pass safely, and that the dishwasher does not prevent access to the sink or refrigerator. Include filler panels, handles, countertop overhangs, appliance ventilation clearances, and the swing of nearby room doors.
Mark where groceries enter, where food is prepared, and where dirty dishes leave. Confirm that windows, outlets, switches, heat registers, and structural posts do not conflict with cabinetry. If an appliance is not yet purchased, use its manufacturer’s installation dimensions—not a generic nominal width—and leave the clearances required by that model.
4. Leaving system changes off the plan
“New cabinets and counters” is not a complete scope when the work also moves a sink, adds a dishwasher, changes a gas line, relocates outlets, upgrades lighting, or routes a hood. Show every proposed plumbing, electrical, gas, structural, and mechanical change on the drawings and in the written scope. Identify which walls and ceilings will be opened, where access panels are needed, and who patches and finishes each opening.
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Separating the visible replacement from the concealed work exposes dependencies. A sink move may require drain slope and vent changes; an induction range may require a new circuit; a hood may require a larger duct and makeup-air provisions. Have the relevant trades confirm feasibility before cabinets are ordered.
5. Assuming a permit is never needed
Permit rules are set by the local authority and depend on the work, building type, heritage status, and jurisdiction. Cosmetic replacement may be exempt in one municipality while a change to room dimensions, structure, gas, plumbing, or electrical systems requires plans and inspections elsewhere. Contact the building department before demolition and ask for a written list of required permits, drawings, inspections, and licensed trades.
| Proposed work | Why it may trigger approval | What to verify locally |
|---|---|---|
| Cabinet, counter, or finish replacement only | Often cosmetic, but local exemptions differ | Whether the exemption applies and whether electrical or plumbing is being altered |
| Moving a wall or changing room dimensions | May affect structure, fire separation, egress, or floor area | Permit type, structural drawings, and inspection sequence |
| Relocating gas, plumbing, or electrical services | Changes regulated building systems | Trade licensing, permit applications, rough-in and final inspections |
| New or rerouted exhaust duct | May affect fire safety, exterior penetrations, and mechanical requirements | Duct, termination, clearances, and makeup-air rules |
For location-specific examples, New York City’s Department of Buildings guidance discusses permits and plans based on complexity and cites rerouted gas with added electrical outlets and moving a load-bearing wall as examples requiring ALT2 treatment in that city. Do not transfer that filing category to another municipality. Montréal’s interior-renovation page likewise distinguishes listed cosmetic work from structural or room-dimension changes and may require dimensioned plans.
6. Removing a wall without confirming its role
A wall that looks ordinary may carry joists, roof loads, a beam, utilities, or a required fire or acoustic separation. Do not rely on a partial opening or a contractor’s visual guess. Have a qualified professional trace the framing and services and specify the required beam, posts, footings, temporary shoring, and connection details when the wall is structural.
Confirm whether the proposed opening changes egress, fire separation, plumbing access, or mechanical routing. Obtain engineering documents and approvals before ordering cabinets or scheduling demolition. If the design changes after opening the wall, stop and revise the drawings and price rather than concealing an improvised support.
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7. Hiring regulated trades without checking qualifications
Kitchen work can involve electrical circuits, gas, plumbing, structural engineering, and ventilation. Licensing, insurance, bonding, and inspection requirements differ by jurisdiction and trade. Ask each contractor for the credential number or registration required where you live, proof of current insurance, and references for comparable work. Verify the information with the issuing authority when a public register exists.
Define who is responsible for each specialist and for coordinating inspections. A general contractor’s promise to “handle everything” should still identify the named electrical, plumbing, gas, and engineering professionals. Never let an unqualified worker perform regulated work merely because the task appears small.
8. Accepting an unclear estimate or verbal scope
A useful estimate states quantities, brands or performance specifications, allowances, labour, demolition, disposal, protection of occupied areas, taxes, permit costs, testing, cleanup, and exclusions. It should distinguish a fixed price from an allowance and explain how concealed conditions are priced. Attach the drawings, finish schedule, appliance list, and payment milestones to the contract.
Record every change in a dated written change order showing the revised work, price, schedule effect, and approval. Verbal instructions create disputes over whether a selection was included or whether a field adjustment was optional. Consumer protections are jurisdiction-specific; for example, Ontario’s consumer guidance, updated August 6, 2026, says that when an estimate is included in a renovation contract, the final price cannot exceed it by more than 10% unless the consumer agrees to new work or a new price. That rule does not apply automatically outside Ontario.
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Put permit ownership in the contract: who prepares drawings, submits applications, pays fees, responds to review comments, posts the permit, schedules inspections, and supplies final certificates. State that work requiring an approval will not begin until the approval is issued, and identify who pays for redesign or delay caused by an incomplete application.
Ask to see the issued permit and approved plans before demolition. Keep inspection records and verify that any conditions—such as engineered details, electrical inspection, or gas testing—are closed before finishes conceal the work. A homeowner may remain legally responsible even when a contractor says permits are included, so confirm the rule with your authority.
10. Treating ventilation as an afterthought
Cooking produces moisture, grease, combustion products, and odors. The US Environmental Protection Agency states that “Cooking in the kitchen generates a lot of moisture and odors, and requires ventilation,” and advises that a range hood capture combustion products and vent them directly outdoors (EPA, “Remodeling Your Home and Indoor Air Quality”). Plan the hood, duct route, exterior termination, electrical supply, clearances, noise, and access before cabinets and ceilings are closed.
EPA identifies 100 cubic feet per minute (cfm) as a typical range recommendation, attributing it to ASHRAE and HVI; larger fans may require makeup air. It is not a universal specification. Have the designer or HVAC professional size the system for the cooking equipment, room, duct length, elbows, and local code.
| Ventilation choice | Questions to answer before purchase |
|---|---|
| Outdoor exhaust | Can a correctly sized, smooth duct reach outdoors with an approved termination and acceptable bends? |
| Recirculating filtration | Is outdoor exhaust impossible, and are you accepting that moisture and combustion products are not removed from the room? |
| Higher-capacity hood | Will noise, electrical demand, duct size, and makeup-air requirements be met for the actual range? |
11. Ignoring moisture control and air sealing while walls are open
Once cabinets, drywall, or soffits are removed, accessible gaps around pipes, wires, ducts, and exterior-wall penetrations can be inspected and sealed where appropriate. Repair leaks, replace damaged materials, and address wet insulation or framing before closing the wall. Seal penetrations with products suitable for their location and required fire or smoke rating; do not block intentional drainage or ventilation paths.
Coordinate air sealing with insulation, vapour-control, and exterior-wall requirements for your climate and building type. Keep plumbing shutoffs and cleanouts accessible. Photograph concealed work before insulation and drywall so future repairs do not depend on memory.
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12. Discovering inadequate electrical capacity during installation
Modern kitchens may add a refrigerator, dishwasher, disposal, microwave, hood, lighting, countertop receptacles, and electric cooking equipment. Have an electrician evaluate the service, panel capacity, grounding, existing circuits, receptacle locations, and required dedicated circuits before cabinet fabrication. Check the appliance installation instructions for voltage, amperage, breaker, disconnect, and clearance requirements.
Do not solve a tripping breaker by fitting a larger breaker or using extension cords. Provide countertop receptacles and protection required by your local code, coordinate outlet heights with backsplash and cabinetry, and leave access to shutoffs and disconnects. Schedule rough-in inspection before insulation, drywall, or cabinets conceal the wiring.
13. Choosing finishes and fixtures without considering lifetime use
Compare materials on more than colour and initial price. Consider resistance to water, heat, staining, impact, and cleaning chemicals; repairability; maintenance frequency; indoor-air-quality implications; expected service life; replacement availability; and resource use. CMHC’s 2007 guide, Your Kitchen: Renovating, advises homeowners to identify desired features clearly before proceeding (Canada Mortgage and Housing Corporation). That guide is useful for planning prompts, not current code or product-performance proof.
Request current manufacturer specifications, care instructions, warranties, emissions information where relevant, and documented lead times. Test samples under your lighting and confirm that replacement filters, hardware, seals, and touch-up materials will remain available. A slightly higher upfront cost can be sensible when it reduces water damage risk, difficult cleaning, premature replacement, or waste—but make that decision from verified product information rather than a sales claim.
Quick Recap
A final pre-demolition check
- Existing conditions are photographed, measured, and tested where necessary.
- Proposed plans show dimensions, appliances, finishes, and every electrical, plumbing, gas, structural, and mechanical change.
- Local permits, inspections, licensed trades, and engineering requirements are confirmed in writing.
- The contract names permit responsibilities, inclusions, exclusions, allowances, payment milestones, and the written-change process.
- Ventilation is sized for the cooking setup, with an outdoor route and makeup-air decision documented.
- Moisture repairs, air sealing, service access, and concealed-work photographs are included in the sequence.
- Electrical capacity and appliance circuits are approved before cabinets and finishes are installed.
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