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Solar panel cost in Hounslow (TW14)

See realistic solar installation costs, savings and payback for TW14 (Hounslow) in under a minute using official UK data. Start with the calculator, then get a no-obligation quote from an MCS-certified installer. You can also ask the SolarByPostcode assistant to sanity-check your roof, bills and plans.

Solar Calculator

Change the settings below to see how costs and savings work for your situation.

System Size

Roof Direction

Battery Storage

Export Value

Your Numbers

Break-even
11.0 years
After this, it's pure profit
Upfront Cost
£7,307
What you pay to get started
Annual Benefit
£663
What you save every year
Profit Over 25 Years
£9,272
After paying itself off, you're this much ahead

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How we calculate this

Solar generation: Based on typical south-facing roof at 35° angle. We account for weather, dirt, and system losses (14%).

How much you'll use directly:

  • Without battery: You'll use about 40% of what you generate. The rest gets sold back to the grid.
  • With 5 kWh battery: You'll use about 70% (battery stores extra for evening use).
  • With 10 kWh battery: You'll use about 75% (more storage means less exported).
  • Panel-only payback: The official cost per kW is lower above 4 kW, so a 5–6 kW system can pay back a little faster than a 3–4 kW system on otherwise identical assumptions.
  • Battery & payback: Batteries raise self-use and cut bills, but added hardware cost often lengthens break-even at typical UK rates.
  • When a battery can still make sense:
    • Evening-heavy usage patterns
    • Time-of-use tariffs / cheap night rates
    • Low export rate vs. high unit rate
    • Heat pump or EV charging synergy
    • Optional backup/resilience (system-dependent)
    • Lower evening-hour CO₂ vs. grid

Panel costs: Uses March 2026 TIC mean installation costs: £1,827/kW up to 4 kW and £1,628/kW above 4 kW.

Other costs: Battery prices are modelled at £700 per kWh. Export tariffs vary by supplier (usually 5–15p per kWh).

Grid connection: Systems up to about 3.7 kW typically need just a notification (G98). Larger systems may need permission (G99).

These are typical values based on average usage patterns. Your actual results will vary based on your roof, shading, and how you use electricity.

Your area in context

In Southern, the current unit rate is 26.42p/kWh with a 49.70p/day standing charge. Your postcode’s south-facing sunshine yield is 1001 kWh/kW — 1 below the regional median (1001).

Read the full story

A typical roof here lands around 4.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1001 kWh per year on a south-facing roof. We value self-used electricity at 26.4p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.4p/kWh
Standing charge
49.7p/day
Sunshine yield (south)
1001 kWh/kW
Export price (baseline)
10p/kWh

Browse the scenarios below. Each battery size has its own expand — open the one that matches your plan (or just explore). For each system size (2–8 kW) we show annual output, how much you use directly, what gets exported, annual benefit, upfront cost, break-even, and a 20-year net. Negative numbers are possible — that’s the honest trade-off when adding more battery than your usage profile justifies.

No battery 5 kW example → Annual benefit: £829, Upfront: £9,134, Break-even: 11.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2001 kWh 801 kWh 1201 kWh £211 £120 £332 £3,654 11.0 yrs £2,978
3 kW 3002 kWh 1201 kWh 1801 kWh £317 £180 £497 £5,481 11.0 yrs £4,467
4 kW 4003 kWh 1601 kWh 2402 kWh £423 £240 £663 £7,307 11.0 yrs £5,956
5 kW 5003 kWh 2001 kWh 3002 kWh £529 £300 £829 £9,134 11.0 yrs £7,445
6 kW 6004 kWh 2402 kWh 3602 kWh £634 £360 £995 £10,961 11.0 yrs £8,934
7 kW 7005 kWh 2802 kWh 4203 kWh £740 £420 £1,161 £12,788 11.0 yrs £10,423
8 kW 8005 kWh 3202 kWh 4803 kWh £846 £480 £1,326 £14,615 11.0 yrs £11,912

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £993, Upfront: £11,234, Break-even: 11.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2001 kWh 1201 kWh 801 kWh £317 £80 £397 £5,754 14.5 yrs £2,192
3 kW 3002 kWh 1801 kWh 1201 kWh £476 £120 £596 £7,581 12.7 yrs £4,339
4 kW 4003 kWh 2402 kWh 1601 kWh £634 £160 £795 £9,407 11.8 yrs £6,485
5 kW 5003 kWh 3002 kWh 2001 kWh £793 £200 £993 £11,234 11.3 yrs £8,631
6 kW 6004 kWh 3602 kWh 2402 kWh £952 £240 £1,192 £13,061 11.0 yrs £10,777
7 kW 7005 kWh 4203 kWh 2802 kWh £1,110 £280 £1,391 £14,888 10.7 yrs £12,923
8 kW 8005 kWh 4803 kWh 3202 kWh £1,269 £320 £1,589 £16,715 10.5 yrs £15,069

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,075, Upfront: £12,634, Break-even: 11.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2001 kWh 1401 kWh 600 kWh £370 £60 £430 £7,154 16.6 yrs £1,450
3 kW 3002 kWh 2101 kWh 901 kWh £555 £90 £645 £8,981 13.9 yrs £3,924
4 kW 4003 kWh 2802 kWh 1201 kWh £740 £120 £860 £10,807 12.6 yrs £6,399
5 kW 5003 kWh 3502 kWh 1501 kWh £925 £150 £1,075 £12,634 11.7 yrs £8,874
6 kW 6004 kWh 4203 kWh 1801 kWh £1,110 £180 £1,290 £14,461 11.2 yrs £11,349
7 kW 7005 kWh 4903 kWh 2101 kWh £1,295 £210 £1,506 £16,288 10.8 yrs £13,824
8 kW 8005 kWh 5604 kWh 2402 kWh £1,480 £240 £1,721 £18,115 10.5 yrs £16,298

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,100, Upfront: £14,384, Break-even: 13.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2001 kWh 1461 kWh 540 kWh £386 £54 £440 £8,904 20.2 yrs £-103
3 kW 3002 kWh 2191 kWh 811 kWh £579 £81 £660 £10,731 16.3 yrs £2,470
4 kW 4003 kWh 2922 kWh 1081 kWh £772 £108 £880 £12,557 14.3 yrs £5,044
5 kW 5003 kWh 3652 kWh 1351 kWh £965 £135 £1,100 £14,384 13.1 yrs £7,617
6 kW 6004 kWh 4383 kWh 1621 kWh £1,158 £162 £1,320 £16,211 12.3 yrs £10,190
7 kW 7005 kWh 5113 kWh 1891 kWh £1,351 £189 £1,540 £18,038 11.7 yrs £12,764
8 kW 8005 kWh 5844 kWh 2161 kWh £1,544 £216 £1,760 £19,865 11.3 yrs £15,337

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,116, Upfront: £16,134, Break-even: 14.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2001 kWh 1501 kWh 500 kWh £397 £50 £447 £10,654 23.9 yrs £-1,722
3 kW 3002 kWh 2251 kWh 750 kWh £595 £75 £670 £12,481 18.6 yrs £917
4 kW 4003 kWh 3002 kWh 1001 kWh £793 £100 £893 £14,307 16.0 yrs £3,556
5 kW 5003 kWh 3752 kWh 1251 kWh £991 £125 £1,116 £16,134 14.5 yrs £6,196
6 kW 6004 kWh 4503 kWh 1501 kWh £1,190 £150 £1,340 £17,961 13.4 yrs £8,835
7 kW 7005 kWh 5253 kWh 1751 kWh £1,388 £175 £1,563 £19,788 12.7 yrs £11,474
8 kW 8005 kWh 6004 kWh 2001 kWh £1,586 £200 £1,786 £21,615 12.1 yrs £14,113

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,133, Upfront: £18,584, Break-even: 16.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2001 kWh 1541 kWh 460 kWh £407 £46 £453 £13,104 28.9 yrs £-4,040
3 kW 3002 kWh 2312 kWh 690 kWh £611 £69 £680 £14,931 22.0 yrs £-1,336
4 kW 4003 kWh 3082 kWh 921 kWh £814 £92 £906 £16,757 18.5 yrs £1,369
5 kW 5003 kWh 3853 kWh 1151 kWh £1,018 £115 £1,133 £18,584 16.4 yrs £4,074
6 kW 6004 kWh 4623 kWh 1381 kWh £1,221 £138 £1,360 £20,411 15.0 yrs £6,779
7 kW 7005 kWh 5394 kWh 1611 kWh £1,425 £161 £1,586 £22,238 14.0 yrs £9,484
8 kW 8005 kWh 6164 kWh 1841 kWh £1,629 £184 £1,813 £24,065 13.3 yrs £12,189

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,827, battery £/kWh = 700.

Figures are illustrative and use the same method as the calculator above. For exact results, adjust your roof direction, tariff, and usage in the calculator.

Before you request quotes in Hounslow

Use the numbers above to sanity-check installer quotes. The main things to compare are system size, battery assumptions, payback claims, MCS certification, DNO paperwork and export assumptions.

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Check what MCS certification means

Understand DNO, G98 and G99 export limits

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Insights for TW14

Figures below are tailored to TW14 — click through for full league tables.

Big-Roof Britain Rank #2029 of 2182
4.1 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #2041 of 2996
11.0 years (UK avg 10.8 years)
~£663 /yr • £7,307 upfront
Standing-Charge Drag Rank #1785 of 2996
27.3% (UK avg 26.6%) drag on savings
£181 fixed • ~£663 /yr value
Aspect Penalty View ranking →
East −21.9% West −19.4%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in TW14

Monthly generation per kilowatt of solar panels

kWh 40 Jan 53 Feb 85 Mar 112 Apr 118 May 120 Jun 121 Jul 109 Aug 93 Sep 68 Oct 46 Nov 35 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 51.1% of an average month (Dec–Feb)

Best / worst month: Jul / Dec

These figures show output per kilowatt (kW) of panels installed. In winter, a 1 kW system here produces about 43 kWh per month; the average month produces around 83 kWh. So a typical 4 kW home system would generate roughly 171 kWh in winter, or 334 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
49.70p/day
Local Sunshine
1001kWh/kW
A 1 kW system generates ~1001 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
4.0kW
For houses & bungalows in this area

Local Property Data

Property Types

Houses: 49% • Flats: 40% • Bungalows: 3% Based on 7,148 properties

Coverage

Hounslow (98%)|Hillingdon (2%)

Areas Covered

Bedfont, Feltham North, Hanworth Park, Feltham West, Heathrow Villages, Cranford, Ashford North and Stanwell South, Northwood Hills + 1 more

Data Sources & Assumptions

Solar yield: PVGIS (EU Joint Research Centre), January 2025 data

Electricity rates: Ofgem price cap, Q3 2026

Installation costs: DESNZ/MCS data, March 2026 (TIC)

Property data: EPC open data (Open Government Licence), aggregated

All estimates are typical values. Actual results vary based on your specific situation, roof characteristics, and usage patterns.

Compare nearby areas

Nearby in Southern

TW13 (Hounslow)
≈1.6 km away
Local sunshine: ~1,001 kWh/kWp · +0% vs TW14
TW4 (Hounslow)
≈2.9 km away
Local sunshine: ~996 kWh/kWp · -0% vs TW14
TW6 (Hillingdon)
≈3.2 km away
Local sunshine: ~1,007 kWh/kWp · +1% vs TW14
TW15 (Spelthorne)
≈3.6 km away
Local sunshine: ~1,001 kWh/kWp · +0% vs TW14
TW16 (Spelthorne)
≈3.8 km away
Local sunshine: ~1,001 kWh/kWp · +0% vs TW14
TW5 (Hounslow)
≈4.1 km away
Local sunshine: ~996 kWh/kWp · -0% vs TW14

Similar sunshine across the UK

NR2 (Norwich)
~1,001 kWh/kWp · -0% vs TW14
NR3 (Norwich)
~1,001 kWh/kWp · +0% vs TW14
CB6 (East Cambridgeshire)
~1,001 kWh/kWp · +0% vs TW14