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Solar panel cost in Hounslow (TW13)

See realistic solar installation costs, savings and payback for TW13 (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
£664
What you save every year
Profit Over 25 Years
£9,282
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 — 0 above 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 2003 kWh 801 kWh 1202 kWh £212 £120 £332 £3,654 11.0 yrs £2,982
3 kW 3004 kWh 1202 kWh 1802 kWh £317 £180 £498 £5,481 11.0 yrs £4,473
4 kW 4005 kWh 1602 kWh 2403 kWh £423 £240 £664 £7,307 11.0 yrs £5,964
5 kW 5006 kWh 2003 kWh 3004 kWh £529 £300 £829 £9,134 11.0 yrs £7,455
6 kW 6008 kWh 2403 kWh 3605 kWh £635 £360 £995 £10,961 11.0 yrs £8,946
7 kW 7009 kWh 2804 kWh 4205 kWh £741 £421 £1,161 £12,788 11.0 yrs £10,437
8 kW 8010 kWh 3204 kWh 4806 kWh £847 £481 £1,327 £14,615 11.0 yrs £11,928

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: £994, 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 2003 kWh 1202 kWh 801 kWh £317 £80 £398 £5,754 14.5 yrs £2,197
3 kW 3004 kWh 1802 kWh 1202 kWh £476 £120 £596 £7,581 12.7 yrs £4,346
4 kW 4005 kWh 2403 kWh 1602 kWh £635 £160 £795 £9,407 11.8 yrs £6,495
5 kW 5006 kWh 3004 kWh 2003 kWh £794 £200 £994 £11,234 11.3 yrs £8,643
6 kW 6008 kWh 3605 kWh 2403 kWh £952 £240 £1,193 £13,061 11.0 yrs £10,792
7 kW 7009 kWh 4205 kWh 2804 kWh £1,111 £280 £1,391 £14,888 10.7 yrs £12,941
8 kW 8010 kWh 4806 kWh 3204 kWh £1,270 £320 £1,590 £16,715 10.5 yrs £15,089

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: £1,076, 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 2003 kWh 1402 kWh 601 kWh £370 £60 £430 £7,154 16.6 yrs £1,455
3 kW 3004 kWh 2103 kWh 901 kWh £556 £90 £646 £8,981 13.9 yrs £3,933
4 kW 4005 kWh 2804 kWh 1202 kWh £741 £120 £861 £10,807 12.6 yrs £6,410
5 kW 5006 kWh 3505 kWh 1502 kWh £926 £150 £1,076 £12,634 11.7 yrs £8,888
6 kW 6008 kWh 4205 kWh 1802 kWh £1,111 £180 £1,291 £14,461 11.2 yrs £11,365
7 kW 7009 kWh 4906 kWh 2103 kWh £1,296 £210 £1,507 £16,288 10.8 yrs £13,843
8 kW 8010 kWh 5607 kWh 2403 kWh £1,481 £240 £1,722 £18,115 10.5 yrs £16,320

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: £1,101, 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 2003 kWh 1462 kWh 541 kWh £386 £54 £440 £8,904 20.2 yrs £-98
3 kW 3004 kWh 2193 kWh 811 kWh £579 £81 £660 £10,731 16.2 yrs £2,478
4 kW 4005 kWh 2924 kWh 1081 kWh £772 £108 £881 £12,557 14.3 yrs £5,055
5 kW 5006 kWh 3655 kWh 1352 kWh £966 £135 £1,101 £14,384 13.1 yrs £7,631
6 kW 6008 kWh 4386 kWh 1622 kWh £1,159 £162 £1,321 £16,211 12.3 yrs £10,207
7 kW 7009 kWh 5117 kWh 1892 kWh £1,352 £189 £1,541 £18,038 11.7 yrs £12,783
8 kW 8010 kWh 5848 kWh 2163 kWh £1,545 £216 £1,761 £19,865 11.3 yrs £15,359

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: £1,117, Upfront: £16,134, Break-even: 14.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2003 kWh 1502 kWh 501 kWh £397 £50 £447 £10,654 23.8 yrs £-1,716
3 kW 3004 kWh 2253 kWh 751 kWh £595 £75 £670 £12,481 18.6 yrs £926
4 kW 4005 kWh 3004 kWh 1001 kWh £794 £100 £894 £14,307 16.0 yrs £3,568
5 kW 5006 kWh 3755 kWh 1252 kWh £992 £125 £1,117 £16,134 14.4 yrs £6,210
6 kW 6008 kWh 4506 kWh 1502 kWh £1,190 £150 £1,341 £17,961 13.4 yrs £8,852
7 kW 7009 kWh 5257 kWh 1752 kWh £1,389 £175 £1,564 £19,788 12.7 yrs £11,493
8 kW 8010 kWh 6008 kWh 2003 kWh £1,587 £200 £1,788 £21,615 12.1 yrs £14,135

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: £1,134, 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 2003 kWh 1542 kWh 461 kWh £407 £46 £453 £13,104 28.9 yrs £-4,035
3 kW 3004 kWh 2313 kWh 691 kWh £611 £69 £680 £14,931 22.0 yrs £-1,327
4 kW 4005 kWh 3084 kWh 921 kWh £815 £92 £907 £16,757 18.5 yrs £1,381
5 kW 5006 kWh 3855 kWh 1151 kWh £1,018 £115 £1,134 £18,584 16.4 yrs £4,088
6 kW 6008 kWh 4626 kWh 1382 kWh £1,222 £138 £1,360 £20,411 15.0 yrs £6,796
7 kW 7009 kWh 5397 kWh 1612 kWh £1,426 £161 £1,587 £22,238 14.0 yrs £9,504
8 kW 8010 kWh 6168 kWh 1842 kWh £1,630 £184 £1,814 £24,065 13.3 yrs £12,211

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 TW13

Figures below are tailored to TW13 — click through for full league tables.

Big-Roof Britain Rank #2074 of 2182
4.0 kWp (UK avg 5.1 kWp)
~8 panels (≈430 W)
Solar Payback Index Rank #2040 of 2996
11.0 years (UK avg 10.8 years)
~£663 /yr • £7,307 upfront
Standing-Charge Drag Rank #1784 of 2996
27.3% (UK avg 26.6%) drag on savings
£181 fixed • ~£663 /yr value
Aspect Penalty View ranking →
East −21.7% West −19.5%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in TW13

Monthly generation per kilowatt of solar panels

kWh 39 Jan 52 Feb 85 Mar 112 Apr 119 May 121 Jun 122 Jul 110 Aug 93 Sep 68 Oct 47 Nov 35 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.3% 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 42 kWh per month; the average month produces around 83 kWh. So a typical 4 kW home system would generate roughly 168 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: 47% • Flats: 45% • Bungalows: 2% Based on 8,973 properties

Coverage

Hounslow (98%)|Richmond upon Thames (2%)

Areas Covered

Hanworth Park, Hanworth Village, Feltham West, West Twickenham, Feltham North

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

TW14 (Hounslow)
≈1.6 km away
Local sunshine: ~1,001 kWh/kWp · -0% vs TW13
TW16 (Spelthorne)
≈2.4 km away
Local sunshine: ~1,001 kWh/kWp · -0% vs TW13
TW15 (Spelthorne)
≈3.2 km away
Local sunshine: ~1,001 kWh/kWp · -0% vs TW13
TW4 (Hounslow)
≈3.7 km away
Local sunshine: ~996 kWh/kWp · -1% vs TW13
TW6 (Hillingdon)
≈4.6 km away
Local sunshine: ~1,007 kWh/kWp · +1% vs TW13
TW3 (Hounslow)
≈4.7 km away
Local sunshine: ~996 kWh/kWp · -1% vs TW13

Similar sunshine across the UK

PE3 (Peterborough)
~1,001 kWh/kWp · +0% vs TW13
PE1 (Peterborough)
~1,001 kWh/kWp · +0% vs TW13
NR9 (South Norfolk)
~1,001 kWh/kWp · +0% vs TW13