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Solar panel cost in Richmond upon Thames (TW1)

See realistic solar installation costs, savings and payback for TW1 (Richmond upon Thames) 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
11.1 years
After this, it's pure profit
Upfront Cost
£5,481
What you pay to get started
Annual Benefit
£496
What you save every year
Profit Over 25 Years
£6,907
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 South East, the current unit rate is 26.67p/kWh with a 54.45p/day standing charge. Your postcode’s south-facing sunshine yield is 991 kWh/kW — 38 below the regional median (1029).

Read the full story

A typical roof here lands around 3.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 991 kWh per year on a south-facing roof. We value self-used electricity at 26.7p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
26.7p/kWh
Standing charge
54.5p/day
Sunshine yield (south)
991 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: £826, Upfront: £9,134, Break-even: 11.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1982 kWh 793 kWh 1189 kWh £211 £119 £330 £3,654 11.1 yrs £2,953
3 kW 2973 kWh 1189 kWh 1784 kWh £317 £178 £496 £5,481 11.1 yrs £4,430
4 kW 3964 kWh 1586 kWh 2378 kWh £423 £238 £661 £7,307 11.1 yrs £5,906
5 kW 4955 kWh 1982 kWh 2973 kWh £529 £297 £826 £9,134 11.1 yrs £7,383
6 kW 5946 kWh 2378 kWh 3567 kWh £634 £357 £991 £10,961 11.1 yrs £8,860
7 kW 6937 kWh 2775 kWh 4162 kWh £740 £416 £1,156 £12,788 11.1 yrs £10,336
8 kW 7928 kWh 3171 kWh 4757 kWh £846 £476 £1,321 £14,615 11.1 yrs £11,813

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: £991, 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 1982 kWh 1189 kWh 793 kWh £317 £79 £396 £5,754 14.5 yrs £2,175
3 kW 2973 kWh 1784 kWh 1189 kWh £476 £119 £595 £7,581 12.7 yrs £4,312
4 kW 3964 kWh 2378 kWh 1586 kWh £634 £159 £793 £9,407 11.9 yrs £6,450
5 kW 4955 kWh 2973 kWh 1982 kWh £793 £198 £991 £11,234 11.3 yrs £8,587
6 kW 5946 kWh 3567 kWh 2378 kWh £951 £238 £1,189 £13,061 11.0 yrs £10,724
7 kW 6937 kWh 4162 kWh 2775 kWh £1,110 £277 £1,387 £14,888 10.7 yrs £12,862
8 kW 7928 kWh 4757 kWh 3171 kWh £1,269 £317 £1,586 £16,715 10.5 yrs £14,999

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: £1,074, Upfront: £12,634, Break-even: 11.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1982 kWh 1387 kWh 595 kWh £370 £59 £429 £7,154 16.7 yrs £1,436
3 kW 2973 kWh 2081 kWh 892 kWh £555 £89 £644 £8,981 13.9 yrs £3,903
4 kW 3964 kWh 2775 kWh 1189 kWh £740 £119 £859 £10,807 12.6 yrs £6,371
5 kW 4955 kWh 3468 kWh 1486 kWh £925 £149 £1,074 £12,634 11.8 yrs £8,839
6 kW 5946 kWh 4162 kWh 1784 kWh £1,110 £178 £1,288 £14,461 11.2 yrs £11,307
7 kW 6937 kWh 4856 kWh 2081 kWh £1,295 £208 £1,503 £16,288 10.8 yrs £13,774
8 kW 7928 kWh 5549 kWh 2378 kWh £1,480 £238 £1,718 £18,115 10.5 yrs £16,242

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: £1,098, 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 1982 kWh 1447 kWh 535 kWh £386 £54 £439 £8,904 20.3 yrs £-116
3 kW 2973 kWh 2170 kWh 803 kWh £579 £80 £659 £10,731 16.3 yrs £2,451
4 kW 3964 kWh 2894 kWh 1070 kWh £772 £107 £879 £12,557 14.3 yrs £5,018
5 kW 4955 kWh 3617 kWh 1338 kWh £965 £134 £1,098 £14,384 13.1 yrs £7,584
6 kW 5946 kWh 4340 kWh 1605 kWh £1,158 £161 £1,318 £16,211 12.3 yrs £10,151
7 kW 6937 kWh 5064 kWh 1873 kWh £1,351 £187 £1,538 £18,038 11.7 yrs £12,718
8 kW 7928 kWh 5787 kWh 2140 kWh £1,543 £214 £1,757 £19,865 11.3 yrs £15,285

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: £1,115, 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 1982 kWh 1486 kWh 495 kWh £396 £50 £446 £10,654 23.9 yrs £-1,734
3 kW 2973 kWh 2230 kWh 743 kWh £595 £74 £669 £12,481 18.7 yrs £899
4 kW 3964 kWh 2973 kWh 991 kWh £793 £99 £892 £14,307 16.0 yrs £3,532
5 kW 4955 kWh 3716 kWh 1239 kWh £991 £124 £1,115 £16,134 14.5 yrs £6,165
6 kW 5946 kWh 4459 kWh 1486 kWh £1,189 £149 £1,338 £17,961 13.4 yrs £8,798
7 kW 6937 kWh 5203 kWh 1734 kWh £1,388 £173 £1,561 £19,788 12.7 yrs £11,431
8 kW 7928 kWh 5946 kWh 1982 kWh £1,586 £198 £1,784 £21,615 12.1 yrs £14,064

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: £1,131, 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 1982 kWh 1526 kWh 456 kWh £407 £46 £453 £13,104 29.0 yrs £-4,052
3 kW 2973 kWh 2289 kWh 684 kWh £611 £68 £679 £14,931 22.0 yrs £-1,353
4 kW 3964 kWh 3052 kWh 912 kWh £814 £91 £905 £16,757 18.5 yrs £1,346
5 kW 4955 kWh 3815 kWh 1140 kWh £1,018 £114 £1,131 £18,584 16.4 yrs £4,045
6 kW 5946 kWh 4578 kWh 1368 kWh £1,221 £137 £1,358 £20,411 15.0 yrs £6,744
7 kW 6937 kWh 5341 kWh 1595 kWh £1,425 £160 £1,584 £22,238 14.0 yrs £9,443
8 kW 7928 kWh 6104 kWh 1823 kWh £1,628 £182 £1,810 £24,065 13.3 yrs £12,142

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 Richmond upon Thames

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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Understand DNO, G98 and G99 export limits

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Insights for TW1

Figures below are tailored to TW1 — click through for full league tables.

Big-Roof Britain Rank #2030 of 2182
4.1 kWp (UK avg 5.1 kWp)
~9 panels (≈430 W)
Solar Payback Index Rank #1003 of 2996
9.9 years (UK avg 10.8 years)
~£991 /yr • £9,767 upfront
Standing-Charge Drag Rank #604 of 2996
20.1% (UK avg 26.6%) drag on savings
£199 fixed • ~£991 /yr value
Aspect Penalty View ranking →
East −21.8% West −19.2%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in TW1

Monthly generation per kilowatt of solar panels

kWh 39 Jan 52 Feb 84 Mar 111 Apr 117 May 120 Jun 120 Jul 107 Aug 92 Sep 67 Oct 46 Nov 35 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 50.6% 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 167 kWh in winter, or 330 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.67p/kWh
Daily Fixed Charge
54.45p/day
Local Sunshine
991kWh/kW
A 1 kW system generates ~991 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
3.0kW
For houses & bungalows in this area

⚠️ This area is predominantly flats. Many residents require freeholder approval for solar installations. System size shown reflects houses and bungalows only.

Local Property Data

Property Types

Houses: 34% • Flats: 58% • Bungalows: 1% Based on 7,555 properties

Coverage

Richmond upon Thames (88%)|Hounslow (12%)

Areas Covered

Twickenham Riverside, St Margarets & North Twickenham, Isleworth, South Twickenham, Teddington, Ham, Petersham & Richmond Riverside, West Twickenham

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 South East

TW2 (Richmond upon Thames)
≈1.3 km away
Local sunshine: ~998 kWh/kWp · +1% vs TW1
TW10 (Richmond upon Thames)
≈2.0 km away
Local sunshine: ~995 kWh/kWp · +0% vs TW1
TW11 (Richmond upon Thames)
≈2.5 km away
Local sunshine: ~998 kWh/kWp · +1% vs TW1
TW9 (Richmond upon Thames)
≈2.6 km away
Local sunshine: ~991 kWh/kWp · +0% vs TW1
TW12 (Richmond upon Thames)
≈4.3 km away
Local sunshine: ~1,000 kWh/kWp · +1% vs TW1
KT2 (Kingston upon Thames)
≈4.6 km away
Local sunshine: ~997 kWh/kWp · +1% vs TW1

Similar sunshine across the UK

RG11 (Wokingham)
~991 kWh/kWp · +0% vs TW1
RG40 (Wokingham)
~991 kWh/kWp · +0% vs TW1
WD1 (Watford)
~991 kWh/kWp · -0% vs TW1