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Solar panel cost in Buckinghamshire (HP9)

See realistic solar installation costs, savings and payback for HP9 (Buckinghamshire) 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
10.0 years
After this, it's pure profit
Upfront Cost
£9,767
What you pay to get started
Annual Benefit
£978
What you save every year
Profit Over 25 Years
£14,693
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 984 kWh/kW — 17 below 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 984 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)
984 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: £815, Upfront: £8,139, Break-even: 10.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1968 kWh 787 kWh 1181 kWh £208 £118 £326 £3,256 10.0 yrs £3,267
3 kW 2953 kWh 1181 kWh 1772 kWh £312 £177 £489 £4,883 10.0 yrs £4,901
4 kW 3937 kWh 1575 kWh 2362 kWh £416 £236 £652 £6,511 10.0 yrs £6,534
5 kW 4921 kWh 1968 kWh 2953 kWh £520 £295 £815 £8,139 10.0 yrs £8,168
6 kW 5905 kWh 2362 kWh 3543 kWh £624 £354 £978 £9,767 10.0 yrs £9,801
7 kW 6889 kWh 2756 kWh 4134 kWh £728 £413 £1,141 £11,394 10.0 yrs £11,435
8 kW 7874 kWh 3149 kWh 4724 kWh £832 £472 £1,305 £13,022 10.0 yrs £13,068

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: £977, Upfront: £10,239, Break-even: 10.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1968 kWh 1181 kWh 787 kWh £312 £79 £391 £5,356 13.7 yrs £2,460
3 kW 2953 kWh 1772 kWh 1181 kWh £468 £118 £586 £6,983 11.9 yrs £4,740
4 kW 3937 kWh 2362 kWh 1575 kWh £624 £157 £782 £8,611 11.0 yrs £7,020
5 kW 4921 kWh 2953 kWh 1968 kWh £780 £197 £977 £10,239 10.5 yrs £9,300
6 kW 5905 kWh 3543 kWh 2362 kWh £936 £236 £1,172 £11,867 10.1 yrs £11,580
7 kW 6889 kWh 4134 kWh 2756 kWh £1,092 £276 £1,368 £13,494 9.9 yrs £13,860
8 kW 7874 kWh 4724 kWh 3149 kWh £1,248 £315 £1,563 £15,122 9.7 yrs £16,140

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: £1,058, Upfront: £11,639, 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 1968 kWh 1378 kWh 591 kWh £364 £59 £423 £6,756 16.0 yrs £1,706
3 kW 2953 kWh 2067 kWh 886 kWh £546 £89 £635 £8,383 13.2 yrs £4,309
4 kW 3937 kWh 2756 kWh 1181 kWh £728 £118 £846 £10,011 11.8 yrs £6,913
5 kW 4921 kWh 3445 kWh 1476 kWh £910 £148 £1,058 £11,639 11.0 yrs £9,516
6 kW 5905 kWh 4134 kWh 1772 kWh £1,092 £177 £1,269 £13,267 10.5 yrs £12,119
7 kW 6889 kWh 4823 kWh 2067 kWh £1,274 £207 £1,481 £14,894 10.1 yrs £14,722
8 kW 7874 kWh 5512 kWh 2362 kWh £1,456 £236 £1,692 £16,522 9.8 yrs £17,325

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: £1,082, Upfront: £13,389, Break-even: 12.4 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1968 kWh 1437 kWh 531 kWh £380 £53 £433 £8,506 19.7 yrs £150
3 kW 2953 kWh 2155 kWh 797 kWh £569 £80 £649 £10,133 15.6 yrs £2,850
4 kW 3937 kWh 2874 kWh 1063 kWh £759 £106 £866 £11,761 13.6 yrs £5,551
5 kW 4921 kWh 3592 kWh 1329 kWh £949 £133 £1,082 £13,389 12.4 yrs £8,251
6 kW 5905 kWh 4311 kWh 1594 kWh £1,139 £159 £1,298 £15,017 11.6 yrs £10,951
7 kW 6889 kWh 5029 kWh 1860 kWh £1,329 £186 £1,515 £16,644 11.0 yrs £13,651
8 kW 7874 kWh 5748 kWh 2126 kWh £1,519 £213 £1,731 £18,272 10.6 yrs £16,351

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: £1,098, Upfront: £15,139, Break-even: 13.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1968 kWh 1476 kWh 492 kWh £390 £49 £439 £10,256 23.3 yrs £-1,470
3 kW 2953 kWh 2214 kWh 738 kWh £585 £74 £659 £11,883 18.0 yrs £1,294
4 kW 3937 kWh 2953 kWh 984 kWh £780 £98 £879 £13,511 15.4 yrs £4,059
5 kW 4921 kWh 3691 kWh 1230 kWh £975 £123 £1,098 £15,139 13.8 yrs £6,824
6 kW 5905 kWh 4429 kWh 1476 kWh £1,170 £148 £1,318 £16,767 12.7 yrs £9,589
7 kW 6889 kWh 5167 kWh 1722 kWh £1,365 £172 £1,537 £18,394 12.0 yrs £12,353
8 kW 7874 kWh 5905 kWh 1968 kWh £1,560 £197 £1,757 £20,022 11.4 yrs £15,118

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: £1,114, Upfront: £17,589, Break-even: 15.8 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1968 kWh 1516 kWh 453 kWh £400 £45 £446 £12,706 28.5 yrs £-3,791
3 kW 2953 kWh 2274 kWh 679 kWh £601 £68 £669 £14,333 21.4 yrs £-962
4 kW 3937 kWh 3031 kWh 905 kWh £801 £91 £891 £15,961 17.9 yrs £1,868
5 kW 4921 kWh 3789 kWh 1132 kWh £1,001 £113 £1,114 £17,589 15.8 yrs £4,697
6 kW 5905 kWh 4547 kWh 1358 kWh £1,201 £136 £1,337 £19,217 14.4 yrs £7,526
7 kW 6889 kWh 5305 kWh 1585 kWh £1,402 £158 £1,560 £20,844 13.4 yrs £10,356
8 kW 7874 kWh 6063 kWh 1811 kWh £1,602 £181 £1,783 £22,472 12.6 yrs £13,185

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 Buckinghamshire

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 HP9

Figures below are tailored to HP9 — click through for full league tables.

Big-Roof Britain Rank #68 of 2182
6.8 kWp (UK avg 5.1 kWp)
~14 panels (≈430 W)
Solar Payback Index Rank #1107 of 2996
10.0 years (UK avg 10.8 years)
~£978 /yr • £9,767 upfront
Standing-Charge Drag Rank #294 of 2996
18.5% (UK avg 26.6%) drag on savings
£181 fixed • ~£978 /yr value
Aspect Penalty View ranking →
East −21.5% West −19.2%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in HP9

Monthly generation per kilowatt of solar panels

kWh 39 Jan 52 Feb 84 Mar 110 Apr 117 May 119 Jun 120 Jul 108 Aug 92 Sep 65 Oct 45 Nov 34 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 82 kWh. So a typical 4 kW home system would generate roughly 166 kWh in winter, or 328 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.42p/kWh
Daily Fixed Charge
49.70p/day
Local Sunshine
984kWh/kW
A 1 kW system generates ~984 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

Houses: 72% • Flats: 21% • Bungalows: 4% Based on 4,792 properties

Coverage

Buckinghamshire (100%)

Areas Covered

Beaconsfield, Chalfont St Giles & Little Chalfont, Penn, Tylers Green & Loudwater, Chalfont St Peter, Farnhams & Stoke Poges

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

HP10 (Buckinghamshire)
≈3.8 km away
Local sunshine: ~993 kWh/kWp · +1% vs HP9
SL8 (Buckinghamshire)
≈5.7 km away
Local sunshine: ~994 kWh/kWp · +1% vs HP9
HP8 (Buckinghamshire)
≈5.8 km away
Local sunshine: ~991 kWh/kWp · +1% vs HP9
SL9 (Buckinghamshire)
≈6.7 km away
Local sunshine: ~989 kWh/kWp · +0% vs HP9
HP15 (Buckinghamshire)
≈6.7 km away
Local sunshine: ~976 kWh/kWp · -1% vs HP9
HP13 (Buckinghamshire)
≈7.2 km away
Local sunshine: ~983 kWh/kWp · -0% vs HP9

Similar sunshine across the UK

LE13 (Melton)
~984 kWh/kWp · +0% vs HP9
GL18 (Forest of Dean)
~984 kWh/kWp · -0% vs HP9
HA8 (Barnet)
~984 kWh/kWp · +0% vs HP9