Air conditioning in Harpenden
We install, service and repair air conditioning in Harpenden and the nearby villages of Redbourn and Wheathampstead. A large part of the town sits in one of the biggest conservation areas in the county, so this page starts with what that means for an outdoor unit.
- conservation area designated
- 1969
- Harpenden postcode district
- AL5
- single room, from
- £1,850
- annual service, from
- £119
A railway town around a common
Harpenden was a small, mainly agricultural village until the late nineteenth century. The council's conservation area statement traces its growth to the railways: a line from Kings Cross to Dunstable in 1860, then the Midland main line in 1868. Late Victorian and Edwardian houses spread out from the High Street and the Common, and the town has kept growing since.
That gives us three main kinds of home to work with: Victorian and Edwardian houses near the centre and the Common, interwar and post-war family houses further out, and newer flats and infill houses throughout.
Planning: St Albans City and District Council
Harpenden is in St Albans district, so planning applications go to St Albans City and District Council, not the county council. Harpenden also has a neighbourhood plan, which the council uses alongside its own policies when it decides applications in the town.
The council's own guidance says adding air conditioning to your home may be permitted development, as long as every limit and condition is met. The main ones: the unit must not be used only for cooling, it must be no bigger than 1.5 m³, and it must pass the MCS 020(a) noise check of 37 dB(A) at neighbours' windows. A semi-detached or terraced house can have one heat pump, a detached house two. Our planning guide sets out the rest.
In July 2026 the government announced that Hertfordshire's county and district councils will be replaced by four unitary councils from 1 April 2028, subject to Parliament's approval. Harpenden would join a new council covering the current St Albans and Dacorum areas. Until then, St Albans City and District Council decides applications.
The Harpenden conservation area
The Harpenden conservation area was designated in 1969 and extended in 1983, 1993 and 1999. The council's 2008 character statement calls it one of the largest in the county, made up of the town centre, the Common, Hatching Green and the suburbs built after the railway arrived. It splits the area into identity areas, including:
- The High Street and Station Road
- Luton Road, Hollybush Lane and Park Hill
- The Avenues west of the town centre, and Park Avenue
- The Common, West Common and the houses around them
- Hatching Green and the Southdown area
What the conservation area means for an outdoor unit
Inside a conservation area, a unit can't go on a wall or roof facing the road under permitted development, and it can't be closer to a bordering road than the house itself. Many older Harpenden houses are detached, or semi-detached pairs, in mature gardens, so a rear or side position usually works. Corner plots need more care, because two walls may face a road.
Listed buildings always need planning permission and listed building consent. If you're unsure, the council suggests a Lawful Development Certificate, which confirms in writing that the work doesn't need permission.
Harpenden homes and how we approach them
| Type of home | Typical areas | How we approach it |
|---|---|---|
| Late Victorian and Edwardian houses | The Avenues, Luton Road and streets near the Common | Inside the conservation area. Rear or side units with neat pipework, out of sight from the road. |
| Larger detached houses | Around the Common, West Common and Hatching Green | Room for multi-split or ducted systems. Two heat pumps are allowed on a detached house if each meets the limits. |
| Interwar and post-war family homes | Outside the conservation area, on the edges of town | Usually permitted development. A multi-split can cool several bedrooms from one outdoor unit. |
| Flats and newer infill homes | Near the station and the High Street | Freeholder consent first. One heat pump per block under permitted development, with an outdoor unit up to 0.6 m³. |
Shops, offices and parking
We fit and look after systems in shops, cafes, restaurants, salons, clinics and offices on the High Street, Station Road and across the town. Shopfronts in the conservation area need care with the outdoor unit, so we start with the siting and the paperwork. Commercial installs are done in business hours.
St Albans council runs resident permit parking on a number of Harpenden streets, each set by a traffic order with its own list of eligible addresses. If you live on one, tell us when you book and we'll agree where the van can park.
What air conditioning costs in Harpenden
Our starting prices are the same here as across Hertfordshire and London. Home prices include VAT. Business prices are plus VAT. Planning fees are separate.
- from£1,850inc. VAT
A bedroom or study
2.5 kW wall unit, 5 m pipe, fitted in a day
- from£2,050inc. VAT
A living room
3.5 kW wall unit
- from£2,450inc. VAT
Open plan or a loft
5 kW wall unit
- from£3,650inc. VAT
Two rooms, one outdoor unit
Multi-split
- from£5,100inc. VAT
Three rooms
Multi-split
- from£4,950inc. VAT
Ducted, per zone
Hidden in the ceiling, survey needed
- from£250inc. VAT
Premium range upgrade
Quieter, more efficient unit
- from£119inc. VAT
An annual service
Keeps the manufacturer warranty valid
Areas and postcodes we cover
We cover the whole town and the villages around it, including:
- AL5: Harpenden town centre, the Avenues, West Common, Hatching Green and Southdown
- AL3: Redbourn
- AL4: Wheathampstead
- Nearby: St Albans and Sandridge
Harpenden questions
Do I need planning permission for air conditioning in Harpenden?
Not always. The council says air conditioning may be permitted development if every limit and condition is met. Inside the conservation area, a unit on a wall or roof facing the road needs permission, and listed buildings always do. Applications go to St Albans City and District Council.
How do I know if my house is in the conservation area?
The council's District Mapping Service shows planning constraints, such as conservation areas and Article 4 areas, by address. We check too before we quote. The Harpenden conservation area is large, covering the town centre, the Common and many nearby streets.
Can you cool the bedrooms in a large detached house?
Yes. A multi-split runs several bedrooms from one outdoor unit, from £3,650 for two rooms and £5,100 for three, including VAT. A detached house can have two heat pumps under permitted development, which gives more options for siting.
Is ducted air conditioning possible in a Harpenden house?
Often, if there's loft or ceiling space for the indoor unit and ducts. Only the grilles show in the room. Ducted systems start from £4,950 per zone including VAT and always need a survey first.
Do you cover Redbourn and Wheathampstead?
Yes. Both are in St Albans district, so the same council handles planning. Each has its own conservation area, so we check whether your home is inside it before we quote.
How much is a service for my existing system?
An annual service starts at £119 including VAT, plus £59 for each extra indoor unit on the same visit. Regular servicing keeps the manufacturer's warranty valid. We service most brands, whoever fitted them.