Air conditioning installation in Cheshire

Air conditioning in Cheshire starts with a question about your address. Altrincham, Hale, Bowdon, Timperley and Sale have Cheshire postal addresses and plenty of Cheshire identity, but since 1974 they have been part of Trafford, a Greater Manchester borough. The rest of the county is split between two councils: Cheshire East, which covers Wilmslow, Alderley Edge, Knutsford and Macclesfield, and Cheshire West and Chester, which covers Chester and Northwich. Which of the three you answer to matters, because wherever permitted development stops, that council decides where your outdoor unit can go. On the period streets of Bowdon, Knutsford and Chester, that happens quickly.

The second thing applies under every council: the type of house limits how many outdoor units you can fit without an application, and in the commuter belt that rule often shapes the design more than the budget does.

Two bedrooms in an Altrincham semi

One recent enquiry was for a 1930s semi in Altrincham: two bedrooms that are unbearable on summer nights, and a budget of around £4,000.

The obvious idea is two separate single split systems, one per bedroom. On a semi, that is the version most likely to need planning permission. Under the permitted development rules, a house that is not detached gets one outdoor unit as of right; a detached house gets two [1]. A second condenser on a semi needs an application to Trafford. A multi-split avoids the question: one outdoor unit feeding both bedrooms, with each room still controlled separately.

Our cost guide has the indicative range for two rooms on one condenser. The two extras that most often come up in a semi of this age are a new dedicated circuit if the consumer unit has no spare way (£400–£700 on our figures), and a condensate pump for a front bedroom whose drain cannot fall by gravity to the outside (£120–£250). Ask for both to be priced as separate lines.

Where the condenser goes is usually settled by the side passage. Semis of this period tend to have a drive or path running down the open side, a couple of metres from the next house. It looks convenient, but a narrow gap between two brick walls reflects sound, and the neighbour's side windows are right there. Permitted development depends on the MCS 020(a) calculation showing no more than 42 dB(A) at the neighbour's nearest habitable room [2]. Since May 2025 there is no longer a fixed one-metre boundary rule, so it is the sound calculation that decides how close the unit can sit [1][2]. In many semis a ground stand against the back wall, with the pipework taken up the side and through the loft to the front bedroom, passes more comfortably than a bracket in the passage.

One more condition: the unit must not be used solely for cooling [1]. Specify a reversible system, which nearly everything on the market is, and you also get efficient heating for the bedrooms in spring and autumn.

Bowdon, Hale and older streets in Trafford

South of Altrincham's centre the houses get older and larger, and more of them sit in conservation areas. Inside a conservation area the outdoor unit cannot go on a wall or roof that fronts a highway, and it cannot be nearer to any road bounding the property than the house itself [1].

Some of Bowdon's Victorian villas sit on corner plots, and a corner plot has two road-facing sides, which can leave one sensible position or none. Check Trafford's conservation area map before getting quotes.

Wilmslow, Alderley Edge and Knutsford: more rooms than two condensers

The large detached houses around Wilmslow, Alderley Edge, Prestbury and Knutsford reverse the semi problem. Two outdoor units are permitted development on a detached house [1], and a multi-split condenser can serve up to five indoor units, so most families can cover the bedrooms and a living space without an application. The difficulty comes with houses that want everything: five bedrooms, a home office and a glass-roofed kitchen extension that cooks itself in July. A third condenser needs permission.

In a full renovation, a ducted system is worth pricing for that reason as well as for looks: fitting the ductwork while the ceilings are already open avoids the disruption that rules it out in a finished house. The glazed extension is the room to size most carefully: solar gain through a roof lantern or a run of bifolds can need much more capacity than the floor area suggests. Our room sizing guide explains what the calculation should include.

Knutsford's whole town centre is a conservation area, Alderley Edge has its own, and so does the area around St Bartholomew's church in Wilmslow [5]. Large plots mean noise at the boundary is rarely the problem. The real cost is pipe length between wings, and the external unit guide covers how siting affects it.

Chester inside the walls

Chester's city centre was made a conservation area in 1969, two years after conservation areas were created in law, and the designation covers the whole historic core [3]. The City Walls are a scheduled monument and also listed, and invasive work on them needs scheduled monument consent from Historic England [4]. Most of the buildings along the Rows are individually listed [6].

For anyone living in the centre, usually in a flat above a shop or in a converted townhouse, that has two consequences. Permitted development does not apply to a listed building at all [1], so every external unit needs listed building consent. And listed building consent covers more than the outside: core-drilling a refrigerant route through a seventeenth-century wall or a panelled interior is a change to the building's character and is assessed as one. Some buildings will get consent for a carefully hidden rear-yard condenser. Some will not, and the honest alternative is a unit without an outdoor condenser or no fixed system. The period home guide covers discreet routing where consent is possible. Flats add a freeholder's written consent on top of planning.

Beyond the walls, the Victorian terraces of Hoole and Handbridge have rear yards and back additions where a condenser sits out of sight, and the one-unit rule for non-detached houses applies just as it does in Altrincham.

Macclesfield garrets and Northwich's town centre

Macclesfield's silk-weavers' cottages were built with a top-floor garret workshop and long windows to light the looms. Today those garrets are bedrooms and studies directly under the roof, and they are the rooms that overheat. A single split for the top floor is often the whole project. Macclesfield's town centre has a conservation area, and so do Christ Church and Buxton Road, so check before choosing a wall that faces the street [5].

Northwich's town centre is unusual. Many of its black-and-white buildings were timber-framed so they could be jacked back level as brine extraction caused the ground to subside, and fixing a condenser bracket to a timber frame is something to discuss at the survey.

What a Cheshire quote should show

Prices here follow our national figures in the cost guide. A quote you can rely on names the outdoor unit position, shows the MCS 020(a) result for that position, says whether the design stays within the one-unit or two-unit allowance for your type of house, and gives a heat-load figure for each room. If it includes a second condenser on a semi, it should also say who is applying for planning permission.

For leasehold flats, which have their own sequence of freeholder consent and planning application, see the tower-block section of our Manchester guide. It applies just as much to apartments in Altrincham and Chester.

If you are in Cheshire or Trafford, submit a home enquiry. We'll review your requirements and match you with a suitable installer operating in your area. Tell us whether the house is detached, semi or terraced, which rooms you want covered and where you think the outdoor unit could go. If you are still deciding between one room and several, the cooling planner sorts that out first.