Almost every kitchen sold today is described as custom. Most of them are not — they are custom-finished. You chose the door profile, the paint colour, the hardware, and the countertop material from a range of options, and a set of standard-width boxes was arranged in your room with filler strips covering the gaps.
A genuinely custom kitchen is different in one specific way: its dimensions are derived from your household rather than from a cabinet catalogue. Aisle widths, counter heights, the amount of counter beside each appliance, and the total run of shelf and drawer space are all decided by who cooks in the room and how — then the cabinetry is built to fit that.
That distinction sounds subjective. It isn’t. There is a published set of numbers you can hold any kitchen design against, and asking about them is the fastest way to find out what kind of custom kitchen renovation you are actually being sold.
Custom selection versus custom design
| Custom selection | Custom design | |
|---|---|---|
| What you choose | Finishes, colours, hardware, countertop material | Dimensions, clearances, heights, storage volumes |
| What drives the layout | Available cabinet widths | How your household uses the room |
| Where compromises show | Filler panels, dead corners, awkward aisles | Documented trade-offs you agreed to |
| What you can verify | Samples | Numbers on a drawing |
Both are legitimate. Custom selection is often the right call on a budget or in a rental. But only one of them is worth paying custom cabinetry prices for, and the difference is measurable.
The standard most homeowners have never heard of
The National Kitchen & Bath Association publishes the Kitchen Planning Guidelines with Access Standards — 31 guidelines covering clearances, landing areas, storage volumes, appliance placement, and accessibility. It is the working reference for professional kitchen design in North America, and it is publicly available.
One important caveat, because it matters in British Columbia and most people get it wrong: the NKBA guidelines’ recommendations travel anywhere, but its code citations do not. The code references in the guidelines are drawn from the 2015 International Residential Code and ICC A117.1–2009 — American documents. In BC, the BC Building Code governs, and the NKBA itself instructs designers to check the laws that apply locally and follow those.
So the practical split is this: treat the NKBA numbers as design targets your kitchen design should hit or knowingly miss, and treat the BC Building Code as the legal floor your contractor must satisfy. A designer who conflates the two is guessing.
Five measurements that reveal whether a kitchen is actually custom
1. Aisle width, sized to the number of cooks
The NKBA recommends a work aisle of at least 42 inches for one cook and at least 48 inches where more than one person cooks, measured between counter fronts, tall cabinets, and appliances. A walkway that isn’t a work aisle needs at least 36 inches.
This is the single most revealing question you can ask. If nobody asked how many people cook in your kitchen at the same time, nobody sized your aisle. In a Metro Vancouver kitchen where an island is being added, those six inches between 42 and 48 are often exactly what the island depth is competing for.
2. Landing areas — the counter beside each appliance
Landing area is countertop immediately next to a sink or appliance, and it is where a kitchen either works or annoys you daily. The NKBA recommendations:
| Location | Recommended landing area |
|---|---|
| Cleanup/prep sink | 24 in. on one side, 18 in. on the other |
| Primary prep area | A continuous run 36 in. wide × 24 in. deep beside the sink |
| Cooking surface | 12 in. on one side, 15 in. on the other |
| Cooking surface on an island | Plus at least 9 in. behind the appliance, for safety |
| Refrigerator | 15 in. on the handle side |
| Oven and microwave | 15 in. adjacent |
| Dishwasher | Within 36 in. of the sink edge, with 21 in. of standing space |
Source: NKBA Kitchen Planning Guidelines with Access Standards.
There is also a rule for when two landing areas meet: take the larger of the two requirements and add 12 inches. To count as landing area at all, countertop must be at least 16 inches deep and sit between 28 and 45 inches above the floor.
The NKBA also recommends a total of 158 inches of countertop frontage at 24 inches deep, with 15 inches of clearance above, to cover landing, prep, and storage uses across a whole kitchen.
3. Storage frontage, measured rather than eyeballed
This is where custom kitchen cabinets stop being a finish decision and start being an engineering one. The NKBA sets total shelf and drawer frontage targets by kitchen size:
- Under 150 sq ft: 1,400 inches
- 151–350 sq ft: 1,700 inches
- Over 350 sq ft: 2,000 inches
Frontage is calculated by multiplying cabinet width by the number of shelves and drawers by cabinet depth in feet — so a deep drawer bank contributes far more than its face suggests. Storage more than 84 inches above the floor only counts in a miscellaneous category, which is capped.
There’s a second target that catches most builder kitchens out: a substantial share of that frontage should sit within 72 inches of the main sink centreline — at least 400 inches in a small kitchen, 480 in a medium one, 560 in a large one. And at least one corner cabinet should contain a functional storage device rather than a dead void.
Ask your designer for your kitchen’s frontage number. If they can produce it, they did the arithmetic. If the answer is “plenty of storage,” they didn’t.
4. Counter heights, plural
A standard kitchen has one counter height. The NKBA’s Access Standards recommend at least two work-counter heights — one between 28 and 36 inches above the finished floor, another between 36 and 45 inches — so the room suits people of different heights and different tasks.
Seating clearances follow the same logic. The knee space a seated diner needs changes with counter height: roughly 24 inches wide by 18 inches deep at a 30-inch table, 24 by 15 at a 36-inch counter, and 24 by 12 at a 42-inch counter. Microwave placement is explicitly personal — the NKBA puts the ideal bottom edge about 3 inches below the principal user’s shoulder and no higher than 54 inches off the floor, and if it goes below the counter, at least 15 inches up from the floor.
You cannot specify any of that from a catalogue. Someone has to know who lives in the house.
5. The work triangle, and traffic through it
The kitchen work triangle connects the cooking surface, the cleanup sink, and refrigeration. The NKBA recommends the three legs total no more than 26 feet, with no single leg shorter than 4 feet or longer than 9 feet, and no leg cutting through an island by more than 12 inches. No major traffic route should cross the triangle, and a full-height obstacle — a tall pantry or oven cabinet — shouldn’t separate two of the work centres.
Seating clearance interacts with this directly. Behind a seated diner, the NKBA suggests 32 inches where nobody passes, 36 inches for someone to edge past, and 44 inches for a normal walking route.
Islands are where these numbers collide most often. If a plan shows an island without those clearances resolved, the island is decorative.
Where a good designer breaks the rules on purpose
These are guidelines, not code. Plenty of Metro Vancouver kitchens — condo galleys, older Surrey and Burnaby homes, character houses with load-bearing walls in inconvenient places — physically cannot deliver 158 inches of frontage or a 48-inch aisle without moving structure.
That’s fine. It’s the documentation that separates custom from careless. A real custom kitchen design comes with a short list that reads something like: aisle is 44 inches rather than 48 because widening it would cost the pantry; prep area is 32 inches rather than 36 because the window position is fixed; frontage lands at 1,520 inches against a 1,700 target, with the shortfall taken from wall cabinets in favour of drawers.
You agreed to those trade-offs. That is what you were paying for. A kitchen with no such list didn’t make trade-offs — it inherited them.
The items that aren’t negotiable
Some things aren’t design preferences at all, and they’re worth confirming explicitly in your scope of work:
- Ventilation. The NKBA recommends a correctly sized, ducted system with a minimum of 150 cfm for any cooking surface. Under the IRC referenced in the guidelines, the minimum for a ducted hood is 100 cfm discharging outdoors — never into an attic, soffit, ridge vent, or crawlspace — and systems above 400 cfm need makeup air. Verify the actual requirement against the BC Building Code for your project.
- Clearance above the cooktop. The guidelines allow 24 inches to a protected non-combustible surface, versus 30 inches to combustible material or metal cabinets without an approved hood. Over-the-range microwave clearances are set by the manufacturer.
- Cooktop position. Not under an operable window, and no flammable window treatments above it.
- Electrical. GFCI protection on receptacles serving countertop surfaces, and no receptacles installed face-up in a countertop.
- Lighting. General lighting is a code item; task lighting on every work surface is a design one. Both should be on the plan.
Questions to ask before you sign
Each of these has a number for an answer. Vague answers are the finding.
- How wide is my work aisle, and how many cooks did you size it for?
- What is the total shelf and drawer frontage, and how much sits within 72 inches of the sink?
- What are the landing dimensions beside the range, the fridge, and the sink?
- How many work-counter heights are in this design, and why those?
- What are the three work-triangle legs, and does anything cross them?
- Which NKBA guidelines does this kitchen deliberately not meet, and what did we gain?
- What is the exhaust cfm, where does it discharge, and does it need makeup air?
Frequently asked questions
What is the difference between custom and semi-custom kitchen cabinets?
Semi-custom cabinets come in fixed widths with a choice of finishes, door styles, and internal fittings. Custom kitchen cabinets are built to dimensions set by your room and your storage requirements. The practical difference shows up in irregular rooms and in hitting storage frontage targets, where fixed widths force filler panels and dead corners.
Is the kitchen work triangle still relevant?
Yes, as a check rather than a rule. The NKBA still recommends three legs totalling no more than 26 feet with each leg between 4 and 9 feet, and extends the logic to additional work centres in larger kitchens. In multi-cook kitchens, designers commonly plan separate prep and cleanup zones alongside the triangle.
How much storage should a kitchen have?
The NKBA targets total shelf and drawer frontage of about 1,400 inches for a kitchen under 150 square feet, 1,700 inches for 151–350 square feet, and 2,000 inches above that — with a defined portion of it close to the sink. Frontage counts depth, so drawers contribute more than their face width suggests.
Do NKBA guidelines apply in British Columbia?
The design recommendations apply anywhere. The code citations inside the guidelines are based on American codes, so they do not. In BC, the BC Building Code and your municipality’s requirements govern, and the NKBA directs designers to follow local law.
Does a custom kitchen renovation need a permit?
It depends on scope. Replacing cabinets, countertops, and flooring generally does not, while moving walls or relocating plumbing, electrical, or gas lines generally does. Confirm with your municipality before you finalise a layout, because that answer can change your timeline substantially.
Are these numbers minimums or ideals?
Recommendations. They represent good practice for a range of users rather than legal requirements, and a skilled designer will depart from them when the room demands it — and tell you where and why.
The short version
A custom kitchen renovation is worth paying for when it changes the dimensions of your kitchen, not just its colour. There is a published standard behind that — the NKBA’s Kitchen Planning Guidelines with Access Standards — and a designer doing genuine custom kitchen design can walk you through your plan number by number, including the places where they chose to miss the target and what you gained instead.
Total Renovations designs and builds custom kitchens for homeowners across Surrey, Vancouver, Burnaby, and White Rock. If you want to see what these measurements look like against your own room, start with a conversation about your kitchen — and bring the seven questions above.