A dishwasher can save time, reduce the daily chore of washing dishes and make a busy kitchen considerably easier to manage.
But choosing one is not simply a matter of finding the largest or most expensive model you can afford. Dishwashers vary in size, capacity, installation requirements, programmes, noise levels, water consumption and features.
The right dishwasher needs to fit your kitchen, your household and the way you use it.
This guide explains what to consider before buying a dishwasher, whether you are replacing an old machine or installing one for the first time.
1. Decide Whether You Actually Need a Dishwasher
Before comparing models, think about how often you would use one.
A dishwasher can be particularly useful if:
- Several people live in the household
- You cook frequently
- You regularly entertain guests
- You dislike washing dishes by hand
- You want to reduce the amount of time spent cleaning the kitchen
- You tend to accumulate dishes throughout the day
For a single person or couple who rarely cook, a full-size dishwasher may not always be the most practical use of kitchen space.
However, smaller households can still benefit from a dishwasher if it fits their lifestyle.
The important question is not simply “Is a dishwasher useful?”
It is:
“Would a dishwasher save enough time and effort in my household to justify the space and cost?”
2. Measure Your Kitchen Before Shopping
This is one of the most important steps.
Don’t buy a dishwasher based solely on the dimensions listed on the product page. Measure the space where it will actually be installed.
Check:
- Available width
- Available height
- Available depth
- Door clearance
- Position of nearby cupboards
- Position of plumbing
- Position of electrical connections
- Space required to open the dishwasher fully
Also consider the route the appliance will take when it is delivered.
A dishwasher may fit perfectly into the kitchen but still be difficult to move through a narrow doorway or passage.
3. Choose the Right Dishwasher Size
Dishwashers are generally available in different widths and configurations.
A full-size dishwasher is normally intended for larger households, while narrower models can be useful where kitchen space is limited.
Full-size dishwasher
A full-size model is suitable for households that regularly generate a large number of dishes.
It can accommodate plates, bowls, glasses, cutlery, pots and other kitchen items, depending on the internal configuration.
Slimline dishwasher
A narrower dishwasher can be useful for smaller kitchens.
The trade-off is reduced capacity.
Before choosing a slimline model, consider whether the smaller capacity will still be sufficient for your household.
Compact dishwasher
Compact models can provide an alternative where a conventional dishwasher cannot be accommodated.
However, they naturally provide less capacity.
The best size isn’t necessarily the biggest one you can fit. It is the size that matches your normal washing requirements.
4. Consider Capacity Carefully
Dishwasher capacity is often described using place settings.
A place setting is intended to represent a standard set of dishes and eating utensils for one person.
However, the actual usable space can vary significantly between models.
Two dishwashers with similar advertised capacities can have very different internal layouts.
Look at photographs of the interior and consider whether you can comfortably fit the items you use most often.
For example:
- Large dinner plates
- Pasta bowls
- Mugs
- Wine glasses
- Cooking utensils
- Pots
- Pans
- Serving dishes
If you frequently use large cookware, internal flexibility may matter more than the headline capacity.
5. Pay Attention to the Internal Layout
A dishwasher’s internal design can have a major effect on how useful it is.
Look for features such as:
- Adjustable upper baskets
- Fold-down plate supports
- Adjustable tines
- Separate cutlery basket
- Cutlery tray
- Flexible loading areas
- Height-adjustable baskets
An adjustable upper basket can be particularly useful when you need to accommodate tall items.
A flexible interior may allow you to fit more dishes without increasing the physical size of the appliance.
6. Cutlery Basket or Cutlery Tray?
Different dishwashers use different approaches to cutlery.
Cutlery basket
A conventional basket sits inside the lower section of the dishwasher.
It is simple and familiar but occupies some space that could otherwise be used for dishes.
Cutlery tray
A shallow tray is positioned higher in the dishwasher.
This can provide more room in the lower basket and can separate individual pieces of cutlery more effectively.
However, some people find loading a cutlery tray less convenient.
Neither arrangement is automatically better. Consider which one fits your normal kitchen routine.
7. Look at the Washing Programmes
Modern dishwashers can offer numerous programmes.
Common options may include:
- Normal
- Eco
- Intensive
- Quick
- Delicate
- Glass
- Half load
- Automatic
- Rinse or pre-rinse
You probably won’t need every programme.
For many households, the most important considerations are whether the dishwasher provides an effective everyday cycle, an economical cycle and a more powerful option for heavily soiled cookware.
Don’t pay a premium for a long list of programmes that you are unlikely to use.
8. Understand the Eco Programme
Eco programmes are designed to use resources efficiently.
They may take considerably longer than shorter cycles.
That doesn’t necessarily mean the dishwasher is performing poorly.
The longer cycle can be part of the way the appliance reduces water and energy consumption.
If operating costs are important to you, compare the manufacturer’s published energy and water information rather than assuming that the shortest cycle is the most economical.
9. Consider Water and Energy Consumption
Running costs matter because a dishwasher is an appliance you may use several times a week.
When comparing models, look at:
- Energy consumption
- Water consumption
- Eco programme performance
- Expected annual usage information where supplied
- Available efficiency ratings
Don’t compare appliances solely on purchase price.
A slightly more expensive appliance may make more sense if it offers lower operating costs and better functionality over its expected lifespan.
10. Think About Noise
Noise can be an important consideration, especially in open-plan homes.
If your kitchen is next to the living room, dining area or bedroom, a noisy dishwasher may become irritating.
Look for the manufacturer’s noise specification and compare models within the same category.
Also remember that a dishwasher’s actual perceived noise can depend on:
- Kitchen layout
- Flooring
- Cabinet construction
- Installation
- The type of cycle being used
If you frequently run the dishwasher while people are watching television or sleeping, quiet operation becomes more important.
11. Freestanding or Built-In?
Your kitchen layout will determine which installation type is appropriate.
Freestanding dishwasher
A freestanding model is generally easier to install or replace because it does not necessarily need to be integrated into the kitchen cabinetry.
It can be a useful choice if you are renting or don’t want to make major changes to your kitchen.
Built-in dishwasher
A built-in dishwasher is designed to sit within the kitchen cabinetry.
It can provide a more integrated appearance and may be a good choice when designing or renovating a kitchen.
Fully integrated dishwasher
Fully integrated models are concealed behind a matching cabinet door.
This can create a seamless appearance, although installation can be more involved.
Before buying an integrated dishwasher, confirm that the model is compatible with your kitchen cabinetry.
12. Check the Plumbing Requirements
A dishwasher needs access to an appropriate water supply and drainage system.
Before installation, check:
- Water connection
- Drain connection
- Electrical connection
- Available space
- Position of the sink and plumbing
- Manufacturer installation requirements
If the kitchen was not originally designed for a dishwasher, professional installation may be necessary.
Don’t assume that a dishwasher can simply be placed next to the sink and plugged in.
13. Consider the Electrical Requirements
Check the manufacturer’s installation requirements before purchasing.
Electrical connections should be appropriate for the appliance and installed according to applicable safety requirements.
If you are uncertain about the electrical or plumbing requirements, use a qualified professional rather than improvising.
The purchase price of the dishwasher is only part of the total installation cost.
14. Look at the Drying Performance
Washing is only part of the job.
The dishwasher also needs to dry the dishes effectively.
Different models use different drying systems and approaches.
Look at customer feedback about whether:
- Plates come out dry
- Plastic containers retain water
- Glassware develops spots
- Items need additional drying
- The door can be opened automatically at the end of the cycle
Plastic items can be particularly difficult to dry completely in some dishwashers.
If you use many plastic food containers, consider this when comparing models.
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15. Consider How You Use Your Cookware
Some households mainly wash plates and glasses.
Others want the dishwasher to handle pots, pans and cooking utensils as well.
Think about what you actually want the dishwasher to clean.
Check the manufacturer’s instructions for items that are suitable for dishwasher cleaning.
Certain cookware, knives, wooden utensils and delicate items may require hand washing.
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16. Don’t Assume Everything Can Go in the Dishwasher
Dishwasher-safe doesn’t mean that every kitchen item should automatically be put into the machine.
Always follow the manufacturer’s instructions for individual products.
Items that may require particular care can include:
- Some wooden utensils
- Certain knives
- Delicate glassware
- Some non-stick cookware
- Items with decorative finishes
- Certain plastics
Your dishwasher’s user manual should also explain recommended loading practices.
17. Look at the Controls
Dishwasher controls can range from simple physical buttons to sophisticated touch-sensitive panels.
You may also find models with:
- Digital displays
- Remaining-time indicators
- Delay start
- Programme memory
- Automatic programme selection
- Child locks
- Wi-Fi or app connectivity
Consider whether these features genuinely improve your experience.
A simple dishwasher with controls you understand can be more useful than a highly connected appliance with features you never use.
18. Do You Need a Smart Dishwasher?
Some modern appliances can connect to a smartphone or home network.
Possible functions include:
- Starting or monitoring cycles remotely
- Notifications when a cycle finishes
- Maintenance reminders
- Diagnostic information
- Programme selection through an app
These features can be convenient, but they shouldn’t be the main reason you buy a dishwasher.
Prioritise cleaning performance, capacity, reliability, efficiency and installation compatibility first.
Connectivity is an optional extra.
19. Check the Filter and Cleaning Requirements
Dishwashers clean dishes, but the machine itself still needs maintenance.
Find out how the filter is removed and cleaned.
Also check the manufacturer’s recommendations for:
- Cleaning the interior
- Cleaning spray arms
- Removing food debris
- Descaling
- Cleaning seals
- Using dishwasher cleaner
An appliance that is easy to maintain is likely to be more convenient over the long term.
20. Consider the Dishwasher Detergent System
Different dishwashers can work with different detergent formats.
These may include:
- Powder
- Liquid
- Tablets
- Capsules
Some models have additional functions designed around specific detergent systems.
Don’t assume that the most expensive detergent will necessarily produce the best result. Follow the appliance manufacturer’s recommendations and adjust according to water conditions and cleaning requirements.
21. Think About Hard Water
Water quality can affect dishwasher performance.
Hard water can contribute to mineral deposits and may affect glassware and the internal components of the appliance.
Some dishwashers have settings or systems designed to deal with different water hardness levels.
If this is relevant in your area, check whether the dishwasher allows the appropriate adjustment and whether additional water-softening products are recommended.
22. Read Reviews Carefully
Customer reviews can be useful, but don’t focus only on the overall star rating.
Look for comments about:
- Cleaning performance
- Drying
- Noise
- Reliability
- Ease of loading
- Installation
- Customer service
- Programme length
- Internal capacity
Pay particular attention to reviews from people with a household size and kitchen setup similar to yours.
A dishwasher that works perfectly for a couple may not be ideal for a family of six.
23. Buying a Dishwasher Online
Buying appliances online can make it easier to compare models and prices.
However, check the complete purchase carefully.
Look at:
- Exact model number
- Dimensions
- Installation requirements
- Warranty
- Delivery
- Installation charges
- Removal of your old appliance
- Return conditions
- Payment options
- Availability of spare parts and service
A low advertised price is not necessarily the lowest overall cost.
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24. Think About the Warranty and After-Sales Service
A dishwasher is a substantial appliance, so after-sales support matters.
Before buying, check:
- Warranty length
- What the warranty covers
- Who performs repairs
- Availability of service centres
- Spare-parts availability
- Whether installation affects warranty conditions
A familiar brand with accessible support may provide greater peace of mind than an unfamiliar model with limited local support.
25. Don’t Forget Installation Costs
When budgeting for your dishwasher, allow for more than the purchase price.
Potential additional costs include:
- Plumbing
- Electrical work
- Installation
- Cabinet modifications
- Delivery
- Removal of the old appliance
- Accessories
If your kitchen already has a dishwasher connection, installation may be relatively straightforward.
If it doesn’t, the cost and complexity can be considerably greater.
26. Common Dishwasher Buying Mistakes
Buying without measuring
Always measure the space and confirm the appliance dimensions.
Choosing capacity based only on household size
Internal layout matters as much as advertised capacity.
Ignoring noise
This can become a major issue in an open-plan home.
Paying for features you won’t use
Smart functions and dozens of programmes aren’t essential for everyone.
Forgetting installation
Budget for plumbing, electrical work and installation where necessary.
Ignoring drying performance
Especially if you regularly wash plastic containers.
Failing to check the warranty
A dishwasher is an appliance you may expect to use for years.
Choosing the cheapest model automatically
Purchase price is only one part of the cost of ownership.
27. A Simple Dishwasher Buying Checklist
Before purchasing, check:
- Available space
- Dishwasher dimensions
- Door clearance
- Household size
- Required capacity
- Internal basket configuration
- Cutlery basket or tray
- Washing programmes
- Eco programme
- Water consumption
- Energy consumption
- Noise level
- Drying performance
- Installation requirements
- Plumbing requirements
- Electrical requirements
- Maintenance requirements
- Warranty
- After-sales support
- Delivery costs
- Installation costs
- Return policy
- Customer reviews
Final Thoughts
The best dishwasher isn’t necessarily the biggest, most expensive or most technologically advanced model.
The right choice is the one that fits your kitchen, handles the amount and type of washing your household produces, operates at an acceptable cost and provides the features you will actually use.
Start by measuring the available space and determining the capacity you need. Then compare the internal layout, programmes, efficiency, noise, drying performance and installation requirements.
Finally, look beyond the advertised purchase price. Delivery, installation, warranty and long-term running costs can all affect the real value of the appliance.
Take the time to compare these factors and you are much more likely to end up with a dishwasher that makes your kitchen easier rather than simply adding another expensive appliance to it.