Air conditioning in Hemel Hempstead
We install, service and repair air conditioning in homes and businesses across Hemel Hempstead, from the Old Town and Boxmoor to the new town neighbourhoods and Maylands. Here's how the town's homes, Dacorum's planning rules and parking affect an install.
- designated a new town
- 1947
- businesses at Maylands
- 650+
- single room, from
- £1,850
- annual service, from
- £119
A new town built around an old market town
Hemel Hempstead was designated a new town in 1947. The master plan kept the old market town and its High Street, and ringed it with new neighbourhoods, each with its own shops, churches and open space. Adeyfield came first: the foundation stone for its first house was laid in April 1949.
That history shapes most installs we quote here. The new town neighbourhoods, such as Adeyfield, Bennetts End, Chaulden, Gadebridge, Grovehill and Warners End, are mostly terraces and semis with gardens at the back, plus low-rise blocks of flats. The Old Town and the streets near the station are older. Newer estates sit on the edges of town.
Hemel Hempstead homes and what they mean for an install
| Type of home | Typical areas | What it means for the install |
|---|---|---|
| New town terraces and semis | Adeyfield, Bennetts End, Chaulden, Gadebridge, Grovehill, Warners End | Outdoor unit on the back wall or a ground pad, with short pipe runs to the rear bedrooms. Usually fitted in a day for one room. |
| Low-rise flats and maisonettes | Across the new town neighbourhoods | Freeholder consent first. Permitted development allows one heat pump per block, so we check the block before quoting. |
| Older terraces and period houses | The Old Town, Boxmoor and streets near the station | Parts are in a conservation area. A rear position, out of sight from the street, is the usual answer. |
| Newer estates | Edges of town, including the growth areas to the north and east | Simple installs in well-insulated homes. Check your planning permission and deeds for conditions or covenants about external equipment. |
Planning: Dacorum Borough Council
Planning in Hemel Hempstead is handled by Dacorum Borough Council at The Forum, not by Hertfordshire County Council.
A heating-capable outdoor unit on a house is often permitted development, so no application is needed if every limit 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 terraced or semi-detached house can have one heat pump under these rules. Our planning guide sets out the rest.
The Hemel Hempstead conservation area takes in the Old Town and High Street. It was designated in August 1968, one of the first in the county. Here a unit can't go on a wall or roof facing the road without permission. Nearby villages with their own conservation areas include Piccotts End, Water End, Winkwell, Bovingdon, Flaunden and Great Gaddesden.
When we checked in October 2026, Dacorum's list of Article 4 directions named places such as Berkhamsted, Tring and Northchurch, not Hemel Hempstead. Listed buildings always need consent. If you're unsure, the council's conservation team is happy to advise before you start.
Air conditioning for Maylands and Hemel businesses
Dacorum describes Maylands as the largest employment area in Hertfordshire, with more than 650 businesses and around 20,000 employees. We fit and look after systems in offices, warehouses with office space, showrooms, shops, clinics and small server rooms there and across the town.
Ceiling cassettes suit offices with suspended ceilings. Wall units suit meeting rooms and smaller shops. Commercial installs are done in business hours. We can take over servicing from another installer, set up a maintenance contract for several sites, and carry out F-Gas leak checks where your system needs them.
Parking on install day
Dacorum runs controlled parking zones in parts of Hemel Hempstead, set up because of commuter parking and terraced housing near the stations and the town centre. Permits only work in their own zone. If you live in a zone, tell us when you book and we'll agree where the van can park, because we need to unload the outdoor unit close to the house.
What air conditioning costs in Hemel Hempstead
Our starting prices are the same here as across Hertfordshire and London. Home prices include VAT. Business prices are plus VAT. The survey turns these into a fixed written price.
- 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£3,650inc. VAT
Two rooms, one outdoor unit
Multi-split
- from£5,100inc. VAT
Three rooms
Multi-split
- from£1,795+ VAT
Commercial wall unit
Fitted in business hours
- from£2,750+ VAT
Ceiling cassette
In a suitable suspended ceiling
- from£119inc. VAT
An annual service
Keeps the manufacturer warranty valid
- from£125inc. VAT
Repair diagnostic visit
First hour on site, deducted if you go ahead
Areas and postcodes we cover
We cover the whole town and the villages around it, including:
- HP1: Boxmoor, Chaulden, Gadebridge, Warners End, Bourne End, Piccotts End and Water End
- HP2: Adeyfield, Grovehill, Maylands and Gaddesden Row
- HP3: Apsley, Bennetts End, Leverstock Green, Felden, Bovingdon and Flaunden
- Nearby: Kings Langley, Berkhamsted and Tring
Hemel Hempstead questions
Do I need planning permission for air conditioning in Hemel Hempstead?
Often not. A heating-capable unit on a house can be permitted development if it meets the size, position and noise limits. You'll need permission for a listed building, a cooling-only unit, or a unit on a wall facing the road in the Old Town conservation area. Applications go to Dacorum Borough Council.
I want to cool three bedrooms in my new town semi. How does that work?
On a semi-detached or terraced house, permitted development allows one heat pump. A multi-split solves that: one outdoor unit serves up to three or four indoor units. Three rooms start from £5,100 including VAT. We survey the pipe routes first.
I live in the Old Town. Can I still have air conditioning?
Usually, yes, with care. In a conservation area the outdoor unit can't go on a wall or roof facing the road under permitted development, so we look for a rear or side position. If the building is listed, you'll need listed building consent as well. We help you prepare the details.
Can I fit air conditioning in a flat in a low-rise block?
Sometimes. You'll need the freeholder's written consent whatever the planning position. Permitted development allows one heat pump on a block of flats, with an outdoor unit up to 0.6 m³. If the block already has one, a planning application is needed.
Do you fit air conditioning for businesses at Maylands?
Yes. We fit wall units, ceiling cassettes and multi-room systems, and service existing systems of most brands. Commercial wall units start from £1,795 plus VAT and cassettes from £2,750 plus VAT. Office installs happen in business hours.
How much is a service for an 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. If something has gone wrong, a repair diagnostic visit is £125, deducted if you go ahead.