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Solar panel cost in Hillingdon (TW6)

See realistic solar installation costs, savings and payback for TW6 (Hillingdon) 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
9.8 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£1,001
What you save every year
Profit Over 25 Years
£15,252
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 1007 kWh/kW — 5 above the regional median (1001).

Read the full story

A typical roof here lands around 6.0 kW, with most eligible homes comfortably fitting within 3–6 kW. Each kilowatt of panels produces roughly 1007 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)
1007 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: £834, Upfront: £8,139, Break-even: 9.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2013 kWh 805 kWh 1208 kWh £213 £121 £334 £3,256 9.8 yrs £3,416
3 kW 3020 kWh 1208 kWh 1812 kWh £319 £181 £500 £4,883 9.8 yrs £5,124
4 kW 4027 kWh 1611 kWh 2416 kWh £426 £242 £667 £6,511 9.8 yrs £6,832
5 kW 5033 kWh 2013 kWh 3020 kWh £532 £302 £834 £8,139 9.8 yrs £8,540
6 kW 6040 kWh 2416 kWh 3624 kWh £638 £362 £1,001 £9,767 9.8 yrs £10,248
7 kW 7047 kWh 2819 kWh 4228 kWh £745 £423 £1,168 £11,394 9.8 yrs £11,956
8 kW 8054 kWh 3221 kWh 4832 kWh £851 £483 £1,334 £13,022 9.8 yrs £13,664

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £999, Upfront: £10,239, Break-even: 10.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2013 kWh 1208 kWh 805 kWh £319 £81 £400 £5,356 13.4 yrs £2,638
3 kW 3020 kWh 1812 kWh 1208 kWh £479 £121 £600 £6,983 11.6 yrs £5,008
4 kW 4027 kWh 2416 kWh 1611 kWh £638 £161 £799 £8,611 10.8 yrs £7,377
5 kW 5033 kWh 3020 kWh 2013 kWh £798 £201 £999 £10,239 10.2 yrs £9,746
6 kW 6040 kWh 3624 kWh 2416 kWh £957 £242 £1,199 £11,867 9.9 yrs £12,115
7 kW 7047 kWh 4228 kWh 2819 kWh £1,117 £282 £1,399 £13,494 9.6 yrs £14,484
8 kW 8054 kWh 4832 kWh 3221 kWh £1,277 £322 £1,599 £15,122 9.5 yrs £16,854

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,082, Upfront: £11,639, Break-even: 10.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2013 kWh 1409 kWh 604 kWh £372 £60 £433 £6,756 15.6 yrs £1,900
3 kW 3020 kWh 2114 kWh 906 kWh £559 £91 £649 £8,383 12.9 yrs £4,599
4 kW 4027 kWh 2819 kWh 1208 kWh £745 £121 £866 £10,011 11.6 yrs £7,299
5 kW 5033 kWh 3523 kWh 1510 kWh £931 £151 £1,082 £11,639 10.8 yrs £9,999
6 kW 6040 kWh 4228 kWh 1812 kWh £1,117 £181 £1,298 £13,267 10.2 yrs £12,699
7 kW 7047 kWh 4933 kWh 2114 kWh £1,303 £211 £1,515 £14,894 9.8 yrs £15,399
8 kW 8054 kWh 5637 kWh 2416 kWh £1,489 £242 £1,731 £16,522 9.5 yrs £18,098

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,107, Upfront: £13,389, Break-even: 12.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2013 kWh 1470 kWh 544 kWh £388 £54 £443 £8,506 19.2 yrs £348
3 kW 3020 kWh 2205 kWh 815 kWh £582 £82 £664 £10,133 15.3 yrs £3,147
4 kW 4027 kWh 2940 kWh 1087 kWh £777 £109 £885 £11,761 13.3 yrs £5,946
5 kW 5033 kWh 3674 kWh 1359 kWh £971 £136 £1,107 £13,389 12.1 yrs £8,745
6 kW 6040 kWh 4409 kWh 1631 kWh £1,165 £163 £1,328 £15,017 11.3 yrs £11,544
7 kW 7047 kWh 5144 kWh 1903 kWh £1,359 £190 £1,549 £16,644 10.7 yrs £14,343
8 kW 8054 kWh 5879 kWh 2174 kWh £1,553 £217 £1,771 £18,272 10.3 yrs £17,142

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,123, Upfront: £15,139, Break-even: 13.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2013 kWh 1510 kWh 503 kWh £399 £50 £449 £10,256 22.8 yrs £-1,270
3 kW 3020 kWh 2265 kWh 755 kWh £598 £76 £674 £11,883 17.6 yrs £1,595
4 kW 4027 kWh 3020 kWh 1007 kWh £798 £101 £899 £13,511 15.0 yrs £4,460
5 kW 5033 kWh 3775 kWh 1258 kWh £997 £126 £1,123 £15,139 13.5 yrs £7,325
6 kW 6040 kWh 4530 kWh 1510 kWh £1,197 £151 £1,348 £16,767 12.4 yrs £10,191
7 kW 7047 kWh 5285 kWh 1762 kWh £1,396 £176 £1,573 £18,394 11.7 yrs £13,056
8 kW 8054 kWh 6040 kWh 2013 kWh £1,596 £201 £1,797 £20,022 11.1 yrs £15,921

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,140, Upfront: £17,589, Break-even: 15.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 2013 kWh 1550 kWh 463 kWh £410 £46 £456 £12,706 27.9 yrs £-3,588
3 kW 3020 kWh 2325 kWh 695 kWh £614 £69 £684 £14,333 21.0 yrs £-656
4 kW 4027 kWh 3101 kWh 926 kWh £819 £93 £912 £15,961 17.5 yrs £2,275
5 kW 5033 kWh 3876 kWh 1158 kWh £1,024 £116 £1,140 £17,589 15.4 yrs £5,206
6 kW 6040 kWh 4651 kWh 1389 kWh £1,229 £139 £1,368 £19,217 14.1 yrs £8,137
7 kW 7047 kWh 5426 kWh 1621 kWh £1,434 £162 £1,596 £20,844 13.1 yrs £11,069
8 kW 8054 kWh 6201 kWh 1852 kWh £1,638 £185 £1,824 £22,472 12.3 yrs £14,000

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 1,628, 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 Hillingdon

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 TW6

Figures below are tailored to TW6 — click through for full league tables.

Solar Payback Index Rank #749 of 2996
9.8 years (UK avg 10.8 years)
~£1,001 /yr • £9,767 upfront
Standing-Charge Drag Rank #232 of 2996
18.1% (UK avg 26.6%) drag on savings
£181 fixed • ~£1,001 /yr value
Aspect Penalty View ranking →
East −21.9% West −19.6%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in TW6

Monthly generation per kilowatt of solar panels

kWh 40 Jan 53 Feb 86 Mar 112 Apr 119 May 121 Jun 122 Jul 110 Aug 94 Sep 68 Oct 47 Nov 35 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 51.0% 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 84 kWh. So a typical 4 kW home system would generate roughly 171 kWh in winter, or 336 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
49.70p/day
Local Sunshine
1007kWh/kW
A 1 kW system generates ~1007 kWh per year. A typical home uses ~2,700 kWh per year.
Typical System Size
6.0kW
For houses & bungalows in this area

Local Property Data

Property Types

No EPC data available for this outcode

Coverage

Hillingdon (97%)|Hounslow (2%)|Spelthorne (1%)

Areas Covered

Heathrow Villages, Hounslow Central, Sunbury East, Hounslow West, Stanwell North, Cranford

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

TW19 (Spelthorne)
≈2.8 km away
Local sunshine: ~1,001 kWh/kWp · -1% vs TW6
TW14 (Hounslow)
≈3.2 km away
Local sunshine: ~1,001 kWh/kWp · -1% vs TW6
UB7 (Hillingdon)
≈4.3 km away
Local sunshine: ~1,007 kWh/kWp · +0% vs TW6
UB11 (Hillingdon)
≈4.4 km away
Local sunshine: ~996 kWh/kWp · -1% vs TW6
UB3 (Hillingdon)
≈4.5 km away
Local sunshine: ~996 kWh/kWp · -1% vs TW6
TW15 (Spelthorne)
≈4.6 km away
Local sunshine: ~1,001 kWh/kWp · -1% vs TW6

Similar sunshine across the UK

BR1 (Bromley)
~1,007 kWh/kWp · -0% vs TW6
RH77 (Crawley)
~1,007 kWh/kWp · -0% vs TW6
MK44 (Bedford)
~1,007 kWh/kWp · +0% vs TW6