Air Conditioning in a Fulham Terrace: What Fits, What Needs Planning Consent, and How to Plan a Summer Install

Installing air conditioning in a Fulham terrace really comes down to three constraints that most homeowners don't discover until they are already mid-quote, namely the size of the external unit relative to the rear elevation, whether the property sits inside a Fulham conservation area, which changes what planning consent you need, and whether the electrical supply has the capacity for a dedicated circuit, and if you scope those three things properly at the outset then almost everything else that follows is simply a question of timeline.

What kind of air conditioning fits a Fulham terrace?

The system that almost every Fulham terrace ends up with is a split-system heat pump, meaning one indoor wall unit paired with one external condenser, though a multi-split, which is a single condenser feeding two or three indoor units, works particularly well where you want to cool the front bedroom and the back living area from the same outdoor unit. Ductless is very much the standard here, because ducted systems assume the loft or ceiling void space that most Victorian terraces simply don't have, and as a rough guide a 5kW single-split will run the ground floor of a typical two- or three-bedroom Fulham terrace comfortably, while a multi-split in the 7 to 9kW range will handle the ground floor plus a bedroom.

Does air conditioning need planning permission in Fulham?

Sometimes it does and sometimes it doesn't, and which side of the line you fall on depends on where the external unit lands and whether the property sits within a conservation area. Standard permitted development will usually cover a single external unit on the rear elevation, mounted at ground floor level, provided it is not visible from the street and does not sit within a metre of the property boundary, which is enough for most Fulham terraces with rear gardens; you will, however, need to apply for consent where the unit would be visible from the front elevation, where it is going on a flat roof or a first-floor rear wall, where the property lies inside the Peterborough Conservation Area, roughly the Peterborough Estate taking in Peterborough Road, Perrymead Street and Bovingdon Road, or where it is a Grade II listed terrace, which is rare in Fulham but does exist around Parsons Green and along New King's Road. Since the council application typically takes six to eight weeks, it is well worth checking all of this before you sign a quote.

What are the electrical requirements?

An air conditioning install needs a dedicated 32-amp or 40-amp circuit running from the consumer unit to wherever the outdoor condenser sits, and because most Fulham consumer units fitted before 2010 don't have the spare capacity for that, a consumer unit upgrade often ends up being part of the job. There are two things worth checking before the electrician arrives, the first being RCD protection, which modern installation regulations require but older consumer units may not provide, and the second being the cable route, since running the electrical feed from the consumer unit, usually at the front of the house, to the condenser at the rear tends to involve either surface trunking or lifting a floor; neither is remotely complicated, but both need budgeting into the plan, and if your consumer unit happens to sit at the back of the property, which is rare in Victorian terraces though common in newer flats, this whole part of the job becomes a good deal simpler.

Where does the external condenser go on a Fulham terrace?

On a standard two-storey Fulham terrace there are really three viable positions for the external condenser. The most common by far is the ground-floor rear wall, where the unit is mounted on brackets low enough to sit behind the fence line if the garden depth allows; the second is the side return roof, where a unit can sit on a purpose-built plinth if you have a side return with a flat or lean-to structure; and the third is the rear light well, which for basement flat conversions works reasonably well acoustically but restricts airflow and so is not ideal. It is best to avoid first-floor bracket mounts, which transfer vibration into the bedrooms, boundary fences, which tend to invite neighbour objections, and anything within three metres of a habitable-room window that faces the unit.

How long does an air conditioning install take?

A single-split on a straightforward Fulham terrace generally takes three to five working days, while a multi-split serving three rooms is more like five to eight, and the shape of the week is fairly consistent: the first day is spent marking out, running the electrical feed and mounting the outdoor unit brackets, the second installing the condenser, the refrigerant piping and the indoor unit brackets, and the third fitting the indoor wall units, charging the refrigerant and commissioning the system, with a further day or two after that for any plaster and paint make-good around the wall penetrations. You should add a day if a consumer unit upgrade is part of the scope, and one to two weeks if planning consent is required, in which case the sensible approach is to book the survey now and install once the consent has landed.

When should I book air conditioning in Fulham?

The ideal pattern is to book in autumn or early spring and install in the shoulder season, for two reasons: the reputable installers across SW London are booked six to ten weeks out right through June, July and August, and carrying out install work in an occupied house over the summer is at its most disruptive precisely when you are trying to use the rooms in question. So if you happen to be reading this in the middle of a heatwave, wishing the air conditioning had been fitted last month, the best move is to book now for a late-September install, which gives you far more choice of installer, keeps the disruption to a quieter time of year, and has the system running and ready well before next summer.

What's the maintenance requirement?

Air conditioning needs an annual service, which covers a refrigerant pressure check, a coil clean and a filter replacement and usually takes only an hour or two, and it is worth staying on top of because skipping it will void most manufacturer warranties within twelve months.

Fulham BM handles the electrical preparation, the coordination and the consent process on air conditioning installs, working alongside our HVAC install partners, so if you would like a written quote setting out the scope, the electrical work, the consent status and a realistic timeline, do get in touch through fulhambm.co.uk.