Most appliance mistakes start with one measurement written down too confidently. A cavity looks square, a product card looks clear, and then the installer finds the missing 20 mm. This handbook gives you a repeatable way to measure before you spend money.
FitAppliance covers 2,188 raw spec rows across four categories: fridges, dishwashers, washing machines, and dryers. Retailer product-page links are tracked separately and shown only when reviewed. The tool is useful, but the result is only as good as the measurements you enter. Use this guide to collect those measurements properly.
The cost of getting it wrong
A wrong appliance size costs time before it costs money. You lose the delivery window, negotiate a return, search again, and may live with an empty cavity while the replacement is arranged. If the appliance has been unboxed, the return can become harder.
The cheapest fix is a better measurement routine. Spend 20 minutes with a tape measure, note the tightest points, and check the manual-specific clearances before clicking buy. That small pause can prevent a heavy object from becoming a household problem.
Tools you need
Use a tape measure that reads in millimetres, a notepad or phone note, a torch, and a second person if the cavity is tall or awkward. For narrow spaces, a rigid ruler can help check skirting boards and trim that a flexible tape misses.
Photograph each measurement with the tape visible. This is not about making a perfect record; it is about avoiding “I think it was 700 mm” later. If someone else orders the appliance, photos reduce mistakes.
Universal measurement principles
Measure width, height, and depth in more than one place. Use the smallest reading. Check the installed finish, not the drawing. Include trim, tiles, power points, hoses, handles, skirting boards, and overhead shelves.
Then add a tolerance. FitAppliance lets you test a 5 mm tolerance because household measurements are rarely perfect. A tolerance helps with tape-measure uncertainty; it does not override brand-specific clearance rules or safe delivery access.
Four category overview
Fridges need ventilation and door swing checks. Dishwashers need cavity and service checks. Washing machines need delivery route and lid or door clearance. Dryers need airflow, drain, tank, or duct planning depending on type.
When you use the same measurement method across categories, the comparison becomes easier. The appliance changes, but the discipline stays the same: real cavity, real route, real manual requirement.
Brand-specific differences quick reference
Brand-specific clearance matters most for fridges, but the idea applies elsewhere too. Samsung fridge examples can need 100 mm top clearance, while Haier examples include 25.4 mm cabinet gaps. Dishwasher panel weights and dryer cupboard ventilation are also model-specific.
If a product page says only width, height, and depth, treat that as incomplete. The installation manual is the source for the extra numbers that decide whether the appliance will work in your home.
When to use FitAppliance
Use FitAppliance after you have measured the cavity and delivery route. Enter the category, dimensions, tolerance, and any doorway limit, then filter the result list by brand, price, stars, and availability if you want a shorter shortlist.
The tool does not replace reading the final manual before purchase. It narrows the field so you spend your attention on models that are plausible for your space instead of browsing every appliance in the catalogue.
Common pitfalls
Do not measure an old appliance and assume the new one can use the same space. The old model may have different rear clearance, smaller handles, or a door that opens differently. Measure the cavity itself.
Do not forget the floor. Tiles, timber transitions, and uneven slabs can change the height or make levelling harder. Do not forget daily use either: a machine that fits while closed can still block a walkway when open.
After you measure
Write your final values as a short list: cavity width, cavity height, cavity depth, narrowest doorway, and any known service limits. Keep the list while shopping. If a model is close, check the manual before adding it to the cart.
If the numbers are uncomfortable, choose a smaller appliance rather than forcing a borderline one. The right fit is the model you can deliver, install, ventilate, open, clean, and use without treating every laundry day or grocery shop as a tight manoeuvre.
How to compare two close models
When two appliances both pass the basic fit check, compare the constraint that made the search difficult. For a fridge, that may be top clearance or door swing. For a dishwasher, it may be hose routing. For a washing machine, it may be lift depth. For a dryer, it may be ventilation and filter access.
Then look at the everyday task, not just the delivery day. Can the fridge drawers open with the island behind you? Can the dishwasher door drop without hitting the opposite cabinet? Can the washer door open far enough to load towels? Can the dryer filter be cleaned without moving the stack?
This is where a slightly smaller appliance can be the better product. A 10 mm or 20 mm margin may sound minor in a catalogue, but in a tight laundry or kitchen it can be the difference between normal use and constant irritation.
If you still cannot decide, save both measurements and compare the manuals side by side. Look for the hidden installation work: extra panel limits, plumbing locations, duct length, stacking kit compatibility, and cleaning access. The appliance with fewer hidden conditions is often easier to live with, even if another model has one more feature on the retail page.
After purchase, keep the measurement notes until installation is complete. They are useful if the installer asks why a certain gap was allowed, or if a replacement model is needed later. Good measurements are not just shopping notes; they become the record of why that appliance was chosen for that space.
Pre-purchase checklist
- Measure W/H/D at more than one point and keep the smallest reading.
- Measure the narrowest delivery route before checking product style.
- Read the installation manual for clearance, panel, duct, or hose limits.
- Use a 5 mm tolerance only for measurement uncertainty.
- Check daily-use clearance: door swing, lid lift, drawer access, and filter access.
- Save the final measurement list before comparing models.
Quick reference table
| Category | Primary fit check | Often-forgotten check |
|---|---|---|
| Fridge | Cavity plus ventilation clearance | Door swing and delivery path |
| Dishwasher | 600 mm or 450 mm bay plus services | Panel weight and hose routing |
| Washing machine | Laundry cavity and access route | Doorway turns, lift, or stairs |
| Dryer | Floor or stack space | Vent, drain, tank, and room airflow |