Middlesex
Solar panels in Hillingdon, with the numbers shown.
A 12-panel roof in Hillingdon makes about 6,580 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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What a roof in Hillingdon can generate
From 37 kWh per kWp in December to 126.2 in July: a roof in Hillingdon makes 3.4 times as much in its best month as in its darkest, and 1,034 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 40.5 |
| February | 54.2 |
| March | 88.8 |
| April | 116 |
| May | 123 |
| June | 124 |
| July | 126 |
| August | 112 |
| September | 96.7 |
| October | 68 |
| November | 47.5 |
| December | 37 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
Our GB average is 925 kWh per kWp a year, the mean of the 85 county PVGIS estimates we publish; at 1,034, Hillingdon is 12% above it.
How Hillingdon compares
Hillingdon is one of 23 Middlesex towns we track, and it ranks 1st of 23 for solar yield. The House of Commons Library settlement classification puts it in the core city class, with a population of 328,525, which makes it one of the largest places we publish figures for. Scale changes nothing about the physics: PVGIS gives a roof here 1,034 kWh per kWp a year, 2.83 peak sun hours a day averaged across the seasons, and on the 12p scenario about £247 of the year one benefit comes from solar you use yourself, with export income adding £677.
These are starting numbers, not a quote. The calculator below opens on Hillingdon's own PVGIS figure; change the panels, the battery or the export rate and it reruns. The design call replaces every assumption with your roof and your bills.
Planning applications in Hillingdon go to its own council, and the House of Commons Library classes it as a core city.
The charger is in the installed price but left out of payback: charging savings depend on your mileage and tariff, which the design call models properly.
Your real roof and usage, worked through on a free 30-minute video call. Use the full form or leave three details below.
Price this for your roof
Three details. We call or text within one working day to book your free 30-minute design call, on video or by phone if you prefer.
The figures use PVGIS for the centre of Hillingdon (51.53292, -0.44173), a 26.32p/kWh import price and £1,000 per kWp installed; see the help page for the full method.
Connecting solar to the Hillingdon network
The distribution network operator (DNO) for Hillingdon is Scottish and Southern Electricity Networks (SSEN), which runs the Southern England licence area.
G98 is the simple route. If the inverter, plus any battery, stays at or under 3.68kW per phase, SSEN only has to be told within 28 days after the system is commissioned.
Anything bigger is a G99 case and is applied for first. SSEN says it can take up to 45 working days to issue a quotation for a generation connection above 3.68kW per phase and up to 50kW.
Sources: NESO DNO licence areas (3 May 2024); SSEN, micro-generation connections page, checked 25 September 2026. G98 vs G99, explained.
Adding a heat pump or an EV charger in Hillingdon
A heat pump in Hillingdon
Solar and a heat pump pull in opposite directions through the year: Hillingdon's roofs make 1,140 kWh from November to February on a 12-panel system, and 3,090 kWh from May to August. The heating season leans on the grid, so off-peak rates do the heavy lifting.
Grant support in England comes from the Boiler Upgrade Scheme: £7,500 for an air source or ground source heat pump, £2,500 for air-to-air, and an extra £1,500 until March 2027 where the home is heated by oil or LPG off the gas grid (gov.uk, checked 28 September 2026).
Charging an EV in Hillingdon
From April to September, 67% of a Hillingdon roof's yearly output arrives, peaking at about 800 kWh in July on 12 panels. A car parked at home in daylight can soak up what the house, at around 70 kWh of daytime use that month, cannot.
The calculator above includes a 7.4kW smart charger from £1,100 installed. Renters and flat owners with off-street parking can claim 75% of a chargepoint's cost, up to £500 per socket, until 31 March 2027 (gov.uk, checked 28 September 2026).
The packages, priced before anyone visits
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Hillingdon
Guidance is nationwide, so the benchmarks hold in Hillingdon: repair costs, service scope, and when the inverter is the real fault.
Hillingdon solar questions
What could a roof in Hillingdon generate?
PVGIS puts a roof in Hillingdon at 1,034 kWh per kWp a year, 2.83 peak sun hours a day averaged across the seasons. A 12-panel, 6.36 kWp system makes about 6,580 kWh a year, most of it between April and September.
What would 12 solar panels cost in Hillingdon?
£6,360 for 12 panels (6.36 kWp), the same as in every other place we cover, because solar is priced at £1,000 per kWp installed rather than by area. A battery adds its own installed price on top. Where Hillingdon differs is output: about 6,580 kWh a year from that system.
Do I need permission from the DNO for solar in Hillingdon?
Usually not in advance. SSEN, the network operator for Hillingdon, only needs a G98 notification within 28 days of commissioning for systems up to 3.68kW per phase. Bigger inverter or battery outputs need G99 approval first. SSEN says it can take up to 45 working days to issue a quotation for a generation connection above 3.68kW per phase and up to 50kW. "See our DNO explainer.
How much would export pay on a system in Hillingdon?
It is exported. With typical use and no battery, about 5,640 kWh of the 6,580 kWh a 12-panel system makes in Hillingdon goes to the grid, around £677 a year at 12p. A battery keeps more of it for the evening; the export rates table shows what suppliers pay.
Do solar panels work in winter in Hillingdon?
Yes, at a lower level. PVGIS gives Hillingdon 37 kWh per kWp in December and 40.5 in January, so a 12-panel system makes about 240 kWh and 260 kWh in those months, against 800 kWh in July. Winter output mostly covers daytime use rather than exporting.
How Hillingdon compares with its neighbours
The six closest towns we publish, run through the identical PVGIS query as Hillingdon.
| Town | kWh per kWp a year | vs Hillingdon |
|---|---|---|
| Hillingdon | 1,034 | this town |
| Ealing | 1,028 | −6 kWh |
| Hounslow | 1,032 | −2 kWh |
| Stanwell | 1,026 | −8 kWh |
| Gerrards Cross | 1,023 | −11 kWh |
| Harrow | 1,026 | −8 kWh |
| Ashford (Spelthorne) | 1,024 | −10 kWh |
PVGIS v5.2 for each town centroid, identical assumptions throughout. A few kWh either way is weather-year noise; a spread beyond about 30 kWh per kWp is real geography.
Also for Hillingdon: Solar panels in Hillingdon from OVO Solar & Battery
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Guides worth reading before your call
Sourced, dated and written by us. The same ground we cover on your free call.
The 0% VAT deadline: what ends on 31 March 2027, and what it costs to miss it
The install deadline is still 31 March 2027. Electricity's 0% VAT was extended to the end of June.
Read the guide →Does a standalone battery actually pay back?
No panels means one job: buy cheap, use later. The tariff decides whether it pays.
Read the guide →Smart charge point regulations, explained
Why your charger arrives pre-set to charge overnight, and why it waits before it starts.
Read the guide →Which homes suit a heat pump, and which need work first
The trial data says no property type is unsuitable. Design quality decides the outcome.
Read the guide →What the Smart Export Guarantee actually is
The scheme obliges suppliers to pay above zero, and leaves the rate to them.
Read the guide →Your MCS certificate: what it shows, when it arrives, and how a Smart Export Guarantee supplier uses it
The document your export payments hang on. Who issues it, what it shows, and how to get a copy.
Read the guide →Get my free quote
Takes about two minutes. We call or text within one working day to book your free 30-minute video design call at a time that suits you. We design it around your roof and your numbers, and our MCS-certified, fully insured installation teams install it.