Designing & Planning a Plant or Utility Room – Your Complete Guide

Where should a plant room be located?

Before finalising the layout, the first consideration should be its physical placement in the home’s floorplan. Avid cooks might benefit from extra prep space, a second fridge or freezer and larder storage, so a convenient location could be by the kitchen. Pet owners may need a dog shower, boot racks and drying zones to be accessed via a dedicated external door. If you can arrange flow from outside, through the utility and into the living areas, it will function naturally as a transition zone. These factors are generally lifestyle or aesthetics based, so the decision comes down to your preferences and priorities.

Build It readers Pauline and Frank Mace self built a low-energy timber frame home in the Herefordshire countryside. A host of eco technologies were incorporated to complement the highly airtight structure of the house, including an air source heat pump, which powers the hot water system and underfloor heating. Mechanical ventilation and heat recovery has also been installed to keep a fresh, airy climate inside the house. Photo: Shooting Reels

There is also a further technical element that must be taken into account. “Plan the services in advance – short runs for hot water are best, and pumps must be placed where they won’t disturb you, so not above bedrooms,” says David. Aligning the utility with the kitchen or bathrooms is a smart move, as it keeps plumbing efficient. “In some cases it might be more convenient to have two plant rooms,” says Julian Owen, managing director at Julian Owen Associates. “One reason for splitting it up like this is if you have a gas, oil or wood pellet boiler as they will need a short flue to a nearby outside wall, well away from any openable windows, which restricts the positioning options.”

This well kitted-out utility space features units from the Real Shaker Kitchen collection by deVOL

Of course, some plant equipment can be installed in the loft void – a typical solution for air handling units used in HVAC and MVHR systems. If it’s a cold roof space, this can bring added considerations in regards to insulating equipment, pipework and ducts. Plus, current guidance means solar batteries must only be installed in well-ventilated, fire-safe locations – meaning zones like the attic and below-stairs cupboards are likely to be unsuitable for these systems.

“If you have a young family, make sure your plant room has a secure, lockable door because this room is a risky place for children, full of intriguing taps, levers and control panels that are irresistible to little hands,” says Julian.

How should a plant room be laid out?

So, how do you actually configure this dual-purpose room? Planning to have the utility units on one side, and the plant kit on the other is a great way to maximise the space. “I do not advocate U-shaped surfaces as you lose the corners from an access point of view,” says David. “Instead, I’d recommend a galley layout with only up to two doors ideally opposite each other in the centre, so there’s a clear path going through the middle.”

Build It readers Gordon and Katie Aitken self built an ultra-efficient new home that is comfortable year-round and benefits from extremely low running costs. Their plant room contains the hot water cylinder with an integrated heat pump. Photo: David Barbour

On the utility side, David recommends allowing a 2.5m length for four core appliances such as a washer, dryer, sink and a cupboard – and 600mm depth. For plant equipment, expect  to need 800mm-900mm depth. Having good lighting and ventilation is essential, too.

Some of the tech will generate noise and heat, so providing air inlets and outlets is very important.  “This means you don’t have to trim the bottom off the door for ventilation – and if it’s a fire door, the fire strategy remains intact,” says David.

This Oxford Pebble Grey utility room by Benchmarx Kitchens includes practical features such as a laundry rail near the sink, and is directly accessible from the garden

Positioning MVHR systems above the utility side is often a neat solution if you’re looking at building a compact space. It’s also a wise move to tile the whole floor before starting to fit your appliances, so you have the flexibility to move things around later.

For high-spec builds, it’s a good idea to list every piece of kit before finalising the layout. “Knowing what is going to go in there exactly – such as washing machines, sinks, battery systems – allows you to incorporate more storage and ensure everything fits safely and efficiently,” explains Opinder. Careful pre-planning also helps avoid costly adjustments later, allowing you to prioritise the comfort and design of your home.