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Going custom brings more decisions and more coordination: box construction and materials, measuring and shop drawings, then an installation that has to mesh with countertops, plumbing and electrical work done by other trades. It also takes longer than buying cabinets already sitting in a warehouse, because each box is built only after you approve the drawings.
Our kitchen cabinets page covers finishes, hardware and installing new kitchen cabinets, and our cabinet refacing page covers new doors on existing boxes. This page goes deeper into what a custom shop does differently, rooms beyond the kitchen, box materials and formaldehyde, measuring and shop drawings, the installation sequence and lead times.
Custom vs semi-custom vs stock cabinets: what a cabinet shop builds differently
With stock and semi-custom lines, you fit the room to a set of standard boxes. With custom cabinets, the boxes are fitted to the room: each one is built to the width, height and depth the space calls for, so filler strips shrink or disappear and awkward corners become usable storage.
- Stock cabinets come ready-made in set sizes and a few finishes, the quickest route when the room is a simple rectangle.
- Semi-custom cabinets are standard boxes with catalogue options such as modified depths, more door styles and accessories.
- Custom cabinets leave every dimension, material and detail open, from shallow units for a narrow hallway to a vanity that clears a low window sill.
- Custom work is also the way to match existing cabinets, reproduce period details in an older home or use a species or finish no catalogue line offers.
Custom cabinets beyond the kitchen: vanities, laundry rooms, mudrooms and offices
- Bathroom vanities and linen towers, where moisture calls for water-tolerant box materials and sealed edges.
- Laundry rooms with cabinets over the machines and a folding counter, planned around the water shut-offs and the dryer vent.
- Mudroom lockers, benches and boot storage built to take wet coats and winter gear.
- Home offices, libraries and bars with desks, file drawers, open shelving and glass-front uppers.
- Frameless boxes, with doors covering the whole front, give a clean modern look and easy access to the interior.
- Face-frame boxes, with a solid wood frame around each opening, suit traditional rooms and inset doors that sit flush in the frame.
Custom cabinet box materials by room, and formaldehyde from composite panels
A custom order lets you choose the box material location by location instead of accepting one for the whole job. Many owners put plywood under sinks, in vanities and in laundry rooms, where a leak is most likely, and accept melamine-faced particleboard elsewhere, where its flat, stable panels work well. Ask how the edges are sealed, since bare particleboard and MDF edges swell when they get wet, and what the shelves and drawer boxes are made of.
Composite panels raise a second question. Health Canada lists particleboard, MDF and other composite wood among the household sources of formaldehyde, especially in newly built or renovated homes. Federal regulations set emission limits for these panels, whether sold alone or built into cabinets, and require compliance labels, so a shop should buy only compliant stock. Ask to see the labels or supplier documents, and air out the room well after installation.
Measuring and shop drawings for custom cabinets
A custom shop measures twice: once to design and price the job, and again for fabrication once the walls, windows and often the flooring are in place. The final measure records each wall at several heights, out-of-square corners, ceiling height, window and door trim, and the exact positions of pipes, drains, vents, outlets and switches.
- Choose the sink, faucet and appliances before the drawings are final, because each opening is built around their specifications.
- Shop drawings show a floor plan, an elevation of each wall and key sections, with every box, door, drawer, filler and panel dimensioned.
- Check the clearances on paper: doors and drawers that swing past handles, trim and appliances, and corner units that don't collide.
- Sign the drawings, finish samples and hardware list together, since the shop builds exactly what you approve.
- A change after sign-off can mean rebuilding boxes, so settle the layout before cutting begins.
Installing custom cabinets in sequence with countertops, plumbing and wiring
Custom cabinets sit in the middle of a chain of trades, and the order matters. Plumbing and electrical rough-ins, drywall and usually flooring come first; then the cabinets are set, levelled and fastened; then the countertop is templated on the installed boxes, fabricated and installed; and only then are the sink, faucet, cooktop and backsplash connected and finished. Stone and quartz tops are normally measured after the base cabinets are secured, which builds a wait into the schedule.
- Rough-in plumbing and wiring should follow the shop drawings, so drains and boxes land where the cabinets expect them.
- The installer cuts openings in cabinet backs and bottoms for pipes and cables but doesn't relocate them; that's work for a licensed plumber or electrician.
- Filler panels, end panels, toe kicks and crown moulding are fitted and scribed once the boxes are fixed.
- Doors and drawers get a final adjustment after the countertop and appliances are in, since their weight can shift the alignment slightly.
Custom cabinet lead times, scheduling and the written agreement
Custom cabinets are built after the drawings are signed, so the lead time runs from approval, not from the first visit. It depends on the shop's backlog, the size of the job, the materials and finish chosen and any hardware or specialty items that must be ordered, and sprayed finishes need curing time. Book the cabinet date into the renovation schedule early, because the countertop fabricator, plumber and electrician all wait on it.
- Ask for an estimated delivery window in writing and when the shop will confirm it.
- Tie deposits and progress payments to milestones such as drawing approval, fabrication and installation.
- Get the workmanship and hardware warranties in writing, including what water damage or site modifications do to them.
- Plan a temporary kitchen or bathroom setup if the room will be out of use while you wait.
Custom Cabinets: frequently asked questions
Are custom cabinets better quality than semi-custom?
Not automatically. Custom means built to your dimensions and choices; quality depends on the shop's materials, joinery and finishing. Compare box materials, drawer construction and finish samples, not the label.
Is the countertop measured before or after custom cabinets are installed?
Usually after. Stone and quartz fabricators template on the installed, levelled base cabinets, so the top fits the real boxes and walls rather than the drawings.
What should custom bathroom vanity boxes be made of?
Materials that tolerate moisture, such as plywood or well-sealed melamine panels, with every edge sealed and a finish suited to humid rooms. Good bathroom ventilation matters as much as the material.
Do custom cabinets release formaldehyde?
Their particleboard and MDF parts can, according to Health Canada. Federal rules limit emissions from those panels, so ask the shop to confirm its panels comply, and ventilate the room for a while after installation.
Why do custom cabinets take longer than stock cabinets?
Stock boxes are already built. Custom boxes are made only after you approve the drawings, often with a sprayed finish that needs time to cure, and your job is scheduled among the shop's other orders.
Sources
Written by the LokalMatch editorial team. Reviewed by Zubair Afzal on September 10, 2026. How we write and check our guides