Middlesex
Solar panels in Hounslow, priced before anyone visits.
A 12-panel roof in Hounslow makes about 6,560 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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Sunlight in Hounslow, in numbers
Hounslow's best month is July, at 126.7 kWh per kWp; December manages 36.8. Over the year that comes to 1,032 kWh per kWp, 1% above our Middlesex county estimate.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 40.2 |
| February | 52.9 |
| March | 88.6 |
| April | 116 |
| May | 123 |
| June | 124 |
| July | 127 |
| August | 112 |
| September | 96.8 |
| October | 67.9 |
| November | 47.5 |
| December | 36.8 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
Against Great Britain as a whole: Hounslow makes 1,032 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Hounslow is 12% above it.
How Hounslow compares
Hounslow is one of 23 Middlesex towns we track, and it ranks 2nd of 23 for solar yield. The House of Commons Library settlement classification puts it in the core city class, with a population of 297,766, which makes it one of the largest places we publish figures for. Scale changes nothing about the physics: PVGIS gives a roof here 1,032 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 £675.
Every figure here assumes a clear, south-facing roof at 35 degrees. Yours will differ, which is what the free design call is for; until then, the calculator below tests panels, batteries and export rates on Hounslow's own yield.
Hounslow is its own local planning authority area, and its House of Commons Library settlement class is 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.
Generation is modelled from PVGIS satellite data for Hounslow's own coordinates (51.46916, -0.36302), using the same 26.32p/kWh import value and £1,000 per kWp installed pricing as every Clearline estimate; the methodology is on our help page.
SSEN and your Hounslow connection
Hounslow is served by Scottish and Southern Electricity Networks (SSEN): the town's centre falls inside its Southern England licence area on NESO's boundary map.
Most home systems stay within 3.68kW per phase of inverter output, which puts them on G98, a notification to SSEN within 28 days of switch-on. Panel count does not decide it; the inverter and any battery do.
Larger systems go through G99 instead, applied for before installation. On timing: 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.
Beyond the panels: heating and car charging in Hounslow
A heat pump in Hounslow
In December, the darkest month here, 12 panels in Hounslow make about 230 kWh. That is when a heat pump runs hardest, so its running cost in Hounslow comes down to the tariff and the flow temperature rather than the roof.
In England, the Boiler Upgrade Scheme pays £7,500 towards an air source or ground source heat pump and £2,500 towards an air-to-air one, with £1,500 more until March 2027 for homes heated by oil or LPG with no mains gas (gov.uk, checked 28 September 2026).
Charging an EV in Hounslow
Summer is where a car earns its place. In July, 12 panels in Hounslow make about 810 kWh, against roughly 70 kWh a typical home uses in daylight that month on our calculator's typical-use settings, so there is surplus a smart charger can put into the car instead of exporting it.
If you rent, or own a flat, and have private off-street parking, the government chargepoint grant covers 75% of the cost, capped at £500 a socket, until 31 March 2027 (gov.uk, checked 28 September 2026). The calculator above prices a 7.4kW smart charger from £1,100 installed.
Installed prices, the same in every town
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Hounslow
The same sourced benchmarks apply in Hounslow as everywhere we cover: honest repair pricing and what a service should include.
Common questions about solar in Hounslow
How much electricity do solar panels make in Hounslow?
About 6,560 kWh a year from 12 panels (6.36 kWp), on PVGIS satellite data for Hounslow: 1,032 kWh per kWp, or 2.83 peak sun hours a day on average. July is the strongest month, at about 810 kWh.
What does a typical solar system cost in Hounslow?
Solar is priced at £1,000 per kWp installed wherever you live, so a 12-panel, 6.36 kWp system costs £6,360 in Hounslow, exactly as it would anywhere else, before any battery. Location changes what the system makes, not what it costs: here that is about 6,560 kWh a year. The final figure comes from your roof on the design call.
Which DNO covers Hounslow, and what does it need from me?
Scottish and Southern Electricity Networks (SSEN) covers Hounslow. A home system of up to 3.68kW per phase is notified to SSEN within 28 days of commissioning under G98, and nothing waits on approval. Larger outputs need a G99 application before work starts. 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.
What happens to the solar I do not use in Hounslow?
Around £675 a year at 12p per kWh, for the roughly 5,627 kWh a 12-panel system in Hounslow exports with typical use. Rates vary by supplier and some need their own tariff; the export rates table is dated and sourced.
How much solar does Hounslow get in December?
December is the low point: about 230 kWh from a 12-panel system in Hounslow, on PVGIS data, rising to 810 kWh in July. From November to February the same system makes about 1,130 kWh in total, which is why a battery charged off-peak does more of the work in winter.
How Hounslow compares with its neighbours
The six closest towns we publish, run through the identical PVGIS query as Hounslow.
| Town | kWh per kWp a year | vs Hounslow |
|---|---|---|
| Hounslow | 1,032 | this town |
| Richmond upon Thames | 1,024 | −8 kWh |
| Ealing | 1,028 | −4 kWh |
| Sunbury-on-Thames | 1,024 | −8 kWh |
| Ashford Common | 1,024 | −8 kWh |
| Stanwell | 1,026 | −6 kWh |
| Ashford (Spelthorne) | 1,024 | −8 kWh |
Same PVGIS v5.2 query for every town. Small differences are within year-to-year weather; more than about 30 kWh per kWp apart is geography.
Also for Hounslow: Solar panels in Hounslow 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.
How many solar panels do I need? The honest way to count
One panel is 2.26 square metres. The rest is measuring your roof honestly.
Read the guide →Tesla Powerwall 3 against the alternatives, and where each one wins
The strongest single box in the market, and the houses it is still wrong for.
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 →Do you need to replace your radiators for a heat pump?
Some change, most do not. The room by room arithmetic that decides which.
Read the guide →EV tariffs compared: the cheapest overnight windows
Overnight rates of 6.99p to 9p against a 26.32p capped average, compared.
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.