Air conditioning installation in South London

Most air conditioning installation in south London comes down to one practical question that installers in the suburbs rarely face: how do you get the pipework from the room you want cooled to a wall where the outdoor unit is allowed to go? A mid-terrace house in Brixton, Peckham or Brockley has no side passage. The front elevation faces the street, so the condenser almost always ends up at the back, and if the room is at the front, the refrigerant pipes, the condensate drain and the cable have to cross the house to reach it. That sets the price, the disruption and the length of the installation day more than the choice of brand does.

Flats add a second question before the first: whose wall is it? Much of Lambeth, Southwark and Lewisham is Victorian houses split into two or three flats, plus post-war council estates where many homes were bought under right to buy and are now leasehold. In both cases the outside of the building belongs to someone else.

Terraces with no side access

In a south London terrace the back of the house is usually the outrigger, the narrower two-storey back addition with a kitchen below and a bathroom or small bedroom above. That gives three usual condenser positions: on brackets on the rear wall of the main house, on the flat roof of a single-storey extension, or on a ground-level pad in the garden.

A rear bedroom is the easy case: one hole through the back wall, a short pipe run, done in a day. A front bedroom or front living room is where south London jobs grow. The pipes have to travel through the loft, under floorboards, or boxed in along a ceiling line to reach the back, and an installer who has quoted without asking which way the room faces has not quoted for your house. Our cost estimator adds £300–£1,200 when pipework has to be concealed rather than run on the outside wall, and that is the line most likely to appear on a terraced-house quote here. Everything also goes in through the front door: the condenser, the brackets and the vacuum pump all come down the hall, so clear it before the day.

If you are cooling more than one room, a multi-split with one condenser at the back is usually tidier than two separate systems, because the hardest part, the route across the house, is done once. The period home guide covers routing through chimney breasts, cupboards and floor voids.

Converted flats

In a converted Victorian house the lease almost always reserves the external walls to the freeholder, and a leaseholder fitting their own condenser should expect to need planning permission as well, because permitted development covers a block of flats only as one installation for the whole building [1]. The London guide and the flats guide set out both steps and the order to take them in.

The local wrinkle is the split between floors. The upper flat in a conversion is usually the hottest, and the one with the least choice about where a condenser can go. The lower flat often has the garden. Talk to each other before either of you talks to the freeholder.

Ex-council blocks and leaseholder rules

The big post-war estates around Walworth, Kennington and Camberwell are full of leaseholders whose freeholder is still the council. That makes the council your landlord and your planning authority at once, and the two roles are handled separately: landlord consent under the lease is one application, planning permission is another, and a yes from one is not a yes from the other. Expect the landlord side to have rules on drilling into concrete panels, using communal walkways and balconies, and running anything across shared areas. Deck-access blocks rarely have anywhere for a condenser that is not shared. Ask first, in writing, before paying anyone for a survey.

Garden offices

One recent enquiry was for a garden office, and it is often the easiest room to cool. A garden room is a small, insulated box with the condenser a metre away and no pipework crossing the house. It needs its own electrical supply, normally an armoured cable from the house, which is the item worth checking first. If you live in a flat or maisonette, the condenser will need planning permission and the lease may control what can go in the garden [1].

Conservation areas from Kennington to Dulwich

Many south London streets are protected, from Kennington, Clapham and Stockwell Park in Lambeth to Camberwell Grove and Dulwich Village in Southwark [2][3]. On a terrace the conservation area rule rarely bites, because the condenser was going at the back anyway; it matters on corner and end-of-terrace houses, and the London guide sets out the rule and how to check your street.

Cost

The south London variables are the length of the route from the room to the back of the house, whether the condenser goes on a wall, a flat roof or the ground, and, in a flat, any routing conditions the freeholder attaches to consent. The cost guide has the indicative figures, and the cost estimator gives a range for your rooms.

Next step

Request an installer match. We'll review your requirements and match you with a suitable installer operating in your area. Tell us whether it is a house or a flat, which way the rooms face, and whether you have side or rear access, and if you are a leaseholder, have your freeholder's or managing agent's details ready.