Greater London · Heat pump installation
Air Source Heat Pumps in St Johns
Our engineers work in St Johns on heat pump installation. Diagnosis first, a fixed price and proper paperwork when we finish.
- Questions about where the outdoor unit can go
- Checking emitters for a heat pump
- Planning and permitted development questions
Air source heat pumps for homes and businesses in St Johns
Many air source heat pumps can be installed as permitted development in England, without a planning application. Conditions include a maximum outdoor unit size of 1.5 m³, compliance with MCS 020(a), use for more than cooling alone and a site outside the curtilage of a listed building. We check the rules for your property as part of the survey. If the problem is plans to switch to electric heating with a heat pump and ageing boilers that will need replacing, we can sort it out.
In a flat in St Johns, the lease and the freeholder typically decide where a heat pump can go. The planning rules for flats are stricter than for houses, and we check before designing.
Refrigerant work is written up in the F-Gas records: the work carried out, the refrigerant involved and the quantities. Keep the records with the manual and the warranty documents, as a manufacturer or a future engineer may ask to see them.
- Where
- St Johns (SE13, SE10, SE8)
- Wider area
- Greater London
- Costs
- £8,000–£16,000 before the grant, 0% VAT on homes
- Pricing
- Fixed, in writing
- Accreditations
- NICEIC approved, F-Gas certified, MCS
- Telephone
- 07833 053749
- Page updated
- 30 October 2026
Your questions about air source heat pumps in St Johns
Is the heat pump grant available in St Johns?
Yes, if the home and the heat pump meet the scheme’s rules: St Johns is in England, where it applies. The grant is £7,500 for an air source (air-to-water) heat pump and £2,500 for an air-to-air system that replaces the existing fossil-fuel heating. The installer applies, and we’re MCS certified.
Can I have air conditioning in a flat in St Johns?
Often, yes, but the lease and the freeholder typically have a say. Permitted development rules for flats are tighter than for houses, so we check the outdoor unit position and give you the details to send to the freeholder or managing agent.
Can I fit air conditioning or a heat pump myself?
The refrigerant side has to be done by a qualified engineer working for an F-Gas certified company. That’s the law, not just our preference, and it also matters for the manufacturer’s warranty. We can quote for the whole job, from supply to commissioning.
How long will it take to install a heat pump?
It takes a few days on site, depending on the cylinder, the radiators and the pipework involved. The cylinder, the radiators and the pipework make the biggest difference, and we confirm the timing with your quote.
How does the warranty work?
Warranty is the manufacturer’s own, on its terms. Each brand sets its own conditions and periods, so we explain them on your quote.
What’s the price of a heat pump installation?
An air-to-water heat pump costs £8,000–£16,000 (0% VAT on homes) before the grant. Eligible homes in England and Wales can get £7,500 through the Boiler Upgrade Scheme, and we confirm eligibility before you commit.
Do you look at the job first?
Yes, always. We diagnose before we treat: the survey shows what’s needed, where things go and what access we need and the fixed price is built on it.
Honest limits
We’d rather tell you now than sell you work that won’t help, so here are the limits:
- Tax advice on your own circumstances
- Improving the building’s insulation
- Any gas work on the existing boiler
If you are not sure, just call us on 07833 053749 or send an email and we will give you a straight answer.
Where we work
- Air-to-water heat pumps
- Radiator systems
- Homes heated by oil, LPG or gas
- Hot water cylinders
- Air-to-air heat pumps
- Underfloor heating
The process
If the system has to be off for part of the visit, we tell you before any work starts so it doesn’t catch you out. For businesses, we can typically work room by room or zone by zone. The work takes a few days on site, depending on the cylinder, the radiators and the pipework involved. If your building in St Johns has a managing agent, a concierge or sign-in rules, mention them when you book.
- First we talk through the property and the current system.
- We measure heat loss for every room.
- We design the system, check the radiators and cylinder and look at the outdoor unit position.
- Cost, grant and VAT appear on one fixed-price quote.
- We install, commission and register the system under MCS.
Preparing for the visit
- Move furniture away from the wall where we will be working
- Make sure we can reach the consumer unit or fuse board
- Tell us about parking and loading
Get a fixed-price quote
Our prices page gives typical ranges, but your quote is based on your job, because no two buildings, rooms or systems are the same. Once we’ve looked at the job, from photos or on a survey, you get a fixed price. To start, call us on 07833 053749 or drop us a line.
Read more
Aftercare tips
Here’s the after-treatment advice, in brief:
- Keep up with insulation and draught-proofing
- Check eligibility for the Boiler Upgrade Scheme early
- Know the servicing conditions in your warranty
We show you how to use the controls and explain how a heat pump works differently from a boiler. Steady running suits a heat pump better than switching on and off so we set the controls up with you.
Heat pumps prefer steady, low-temperature running as explained at handover.
Let and managed properties
We regularly work with managing agents. Send the address, what’s needed and how access works, and we’ll send a fixed-price quote.
Where a tenant occupies the property but the landlord owns the system, the lease or tenancy agreement normally sets out who maintains what. We are happy to deal with either side and send the records to whoever needs them.
Also in St Johns
Heat pumps in St Johns: local notes
About 36% of homes in and around St Johns were built before 1919, according to VOA council tax data, and the last census (2021) found about 72% of households live in flats. Period properties can still suit a heat pump, but the design has to start from accurate heat loss figures. Flats are often harder for air-to-water systems, so we look at whether air-to-air suits better. London homes can be short of space for an outdoor unit and cylinder, which affects the choice of heat pump.
Queen's House lies about 1.1 miles north-east. Owners of listed homes need consent before a heat pump is fitted, so it’s one of our first questions. Live in one of the older houses around Church of St John? Expect the survey to look closely at heat loss and at the building’s planning status.
St Johns is about 4 miles south-east of London, in Greater London. For air source heat pumps in and around St Johns, it’s easy to get a fixed-price quote: please ring us on 07833 053749 or fill in the contact form. We work across London and the South East, including St Johns. 764 places in Greater London are on our list, from busy centres to quieter spots.
Not far from St Johns, a recent job of ours was on Loampit Vale, Lewisham (SE13), about 1 mile south-east: installing four Daikin cassette units in the main working area and a wall-mounted unit in the private event space.
If your postcode is in SE13, SE10 and SE8, the property is within reach. That includes properties on Avon Road, Mill Lane and Clare Road and nearby roads. Places around St Johns that are also on our list: New Cross (1 mile west), Deptford (1 mile north), Lewisham (1 mile south-east), Telegraph Hill (1 mile west) and Ladywell (1 mile south). Further out, we also cover London (4 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west) and Kensington (8 miles west).
Around St Johns
In St Johns, that means homes and buildings near Wickham Arms, Brookmill Park and Addey and Stanhope School and the streets around them. Also close by are St. Paul's (0.7 miles north) and Laban Centre (0.8 miles north). St Johns has its own railway station: St Johns station. Nearby you’ll also find Fan Museum (0.9 miles north-east) and Lewisham Shopping Centre (0.7 miles south-east). The countryside around St Johns includes Brookmill Road Local Nature Reserve and Tower Hill.
A customer’s words
“Excellent service from start to finish. Two wall-mounted units installed in our home. Clean, tidy work: they protected all the floors and left no mess. The systems work brilliantly. Would highly recommend.”
Sarah M., East Grinstead