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Solar panel cost in Buckinghamshire (HP15)

See realistic solar installation costs, savings and payback for HP15 (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
12.2 years
After this, it's pure profit
Upfront Cost
£12,207
What you pay to get started
Annual Benefit
£1,003
What you save every year
Profit Over 25 Years
£12,862
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: Bigger systems don’t shorten payback—cost and savings rise together per kW.
  • 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

Costs: Battery prices are typically £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 27.83p/kWh with a 45.70p/day standing charge. Your postcode’s south-facing sunshine yield is 976 kWh/kW — 26 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 976 kWh per year on a south-facing roof. We value self-used electricity at 27.8p and exported surplus at a baseline 10p via SEG. Use the calculator above for your exact tariff.

Unit rate
27.8p/kWh
Standing charge
45.7p/day
Sunshine yield (south)
976 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: £836, Upfront: £10,173, Break-even: 12.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1951 kWh 780 kWh 1171 kWh £217 £117 £334 £4,069 12.2 yrs £2,616
3 kW 2927 kWh 1171 kWh 1756 kWh £326 £176 £501 £6,104 12.2 yrs £3,924
4 kW 3902 kWh 1561 kWh 2341 kWh £434 £234 £669 £8,138 12.2 yrs £5,232
5 kW 4878 kWh 1951 kWh 2927 kWh £543 £293 £836 £10,173 12.2 yrs £6,540
6 kW 5853 kWh 2341 kWh 3512 kWh £652 £351 £1,003 £12,207 12.2 yrs £7,848
7 kW 6829 kWh 2732 kWh 4097 kWh £760 £410 £1,170 £14,242 12.2 yrs £9,157
8 kW 7804 kWh 3122 kWh 4683 kWh £869 £468 £1,337 £16,276 12.2 yrs £10,465

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

3 kWh battery 5 kW example → Annual benefit: £1,010, Upfront: £12,273, Break-even: 12.2 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1951 kWh 1171 kWh 780 kWh £326 £78 £404 £6,169 15.3 yrs £1,908
3 kW 2927 kWh 1756 kWh 1171 kWh £489 £117 £606 £8,204 13.5 yrs £3,912
4 kW 3902 kWh 2341 kWh 1561 kWh £652 £156 £808 £10,238 12.7 yrs £5,915
5 kW 4878 kWh 2927 kWh 1951 kWh £814 £195 £1,010 £12,273 12.2 yrs £7,919
6 kW 5853 kWh 3512 kWh 2341 kWh £977 £234 £1,212 £14,307 11.8 yrs £9,923
7 kW 6829 kWh 4097 kWh 2732 kWh £1,140 £273 £1,413 £16,342 11.6 yrs £11,927
8 kW 7804 kWh 4683 kWh 3122 kWh £1,303 £312 £1,615 £18,376 11.4 yrs £13,931

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

5 kWh battery 5 kW example → Annual benefit: £1,097, Upfront: £13,673, Break-even: 12.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1951 kWh 1366 kWh 585 kWh £380 £59 £439 £7,569 17.3 yrs £1,203
3 kW 2927 kWh 2049 kWh 878 kWh £570 £88 £658 £9,604 14.6 yrs £3,555
4 kW 3902 kWh 2732 kWh 1171 kWh £760 £117 £877 £11,638 13.3 yrs £5,907
5 kW 4878 kWh 3414 kWh 1463 kWh £950 £146 £1,097 £13,673 12.5 yrs £8,259
6 kW 5853 kWh 4097 kWh 1756 kWh £1,140 £176 £1,316 £15,707 11.9 yrs £10,610
7 kW 6829 kWh 4780 kWh 2049 kWh £1,330 £205 £1,535 £17,742 11.6 yrs £12,962
8 kW 7804 kWh 5463 kWh 2341 kWh £1,520 £234 £1,754 £19,776 11.3 yrs £15,314

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

7.5 kWh battery 5 kW example → Annual benefit: £1,123, Upfront: £15,423, Break-even: 13.7 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1951 kWh 1424 kWh 527 kWh £396 £53 £449 £9,319 20.8 yrs £-338
3 kW 2927 kWh 2136 kWh 790 kWh £595 £79 £674 £11,354 16.9 yrs £2,118
4 kW 3902 kWh 2849 kWh 1054 kWh £793 £105 £898 £13,388 14.9 yrs £4,574
5 kW 4878 kWh 3561 kWh 1317 kWh £991 £132 £1,123 £15,423 13.7 yrs £7,030
6 kW 5853 kWh 4273 kWh 1580 kWh £1,189 £158 £1,347 £17,457 13.0 yrs £9,486
7 kW 6829 kWh 4985 kWh 1844 kWh £1,387 £184 £1,572 £19,492 12.4 yrs £11,943
8 kW 7804 kWh 5697 kWh 2107 kWh £1,586 £211 £1,796 £21,526 12.0 yrs £14,399

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

10 kWh battery 5 kW example → Annual benefit: £1,140, Upfront: £17,173, Break-even: 15.1 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1951 kWh 1463 kWh 488 kWh £407 £49 £456 £11,069 24.3 yrs £-1,949
3 kW 2927 kWh 2195 kWh 732 kWh £611 £73 £684 £13,104 19.2 yrs £577
4 kW 3902 kWh 2927 kWh 976 kWh £814 £98 £912 £15,138 16.6 yrs £3,103
5 kW 4878 kWh 3658 kWh 1219 kWh £1,018 £122 £1,140 £17,173 15.1 yrs £5,628
6 kW 5853 kWh 4390 kWh 1463 kWh £1,222 £146 £1,368 £19,207 14.0 yrs £8,154
7 kW 6829 kWh 5122 kWh 1707 kWh £1,425 £171 £1,596 £21,242 13.3 yrs £10,680
8 kW 7804 kWh 5853 kWh 1951 kWh £1,629 £195 £1,824 £23,276 12.8 yrs £13,205

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, battery £/kWh = 700.

13.5 kWh battery 5 kW example → Annual benefit: £1,157, Upfront: £19,623, Break-even: 17.0 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1951 kWh 1502 kWh 449 kWh £418 £45 £463 £13,519 29.2 yrs £-4,260
3 kW 2927 kWh 2253 kWh 673 kWh £627 £67 £694 £15,554 22.4 yrs £-1,664
4 kW 3902 kWh 3005 kWh 897 kWh £836 £90 £926 £17,588 19.0 yrs £931
5 kW 4878 kWh 3756 kWh 1122 kWh £1,045 £112 £1,157 £19,623 17.0 yrs £3,526
6 kW 5853 kWh 4507 kWh 1346 kWh £1,254 £135 £1,389 £21,657 15.6 yrs £6,121
7 kW 6829 kWh 5258 kWh 1571 kWh £1,463 £157 £1,620 £23,692 14.6 yrs £8,717
8 kW 7804 kWh 6009 kWh 1795 kWh £1,672 £179 £1,852 £25,726 13.9 yrs £11,312

Assumptions: south-facing, sensible tilt; self-use shares from site rules; export at 10p baseline. Costs: panels £/kW = 2,035, 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.

Insights for HP15

Figures below are tailored to HP15 — click through for full league tables.

Big-Roof Britain Rank #327 of 2182
5.9 kWp (UK avg 5.1 kWp)
~12 panels (≈430 W)
Solar Payback Index Rank #1200 of 2997
12.2 years (UK avg 12.6 years)
~£1,003 /yr • £12,207 upfront
Standing-Charge Drag Rank #192 of 2997
16.6% (UK avg 24.6%) drag on savings
£167 fixed • ~£1,003 /yr value
Aspect Penalty View ranking →
East −21.2% West −19.1%
Typical output loss versus a south-facing roof (lower is better)

Your Area at a Glance

Your Electricity Rate
27.83p/kWh
Daily Fixed Charge
45.70p/day
Local Sunshine
976kWh/kW
A 1 kW system generates ~976 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: 70% • Flats: 14% • Bungalows: 14% Based on 3,516 properties

Coverage

Buckinghamshire (100%)

Areas Covered

Hazlemere, The Missendens, Ridgeway East, Abbey

Data Sources & Assumptions

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

Electricity rates: Ofgem price cap, Q1 2026

Installation costs: MCS certified installer data, March 2025

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

HP13 (Buckinghamshire)
≈3.4 km away
Local sunshine: ~983 kWh/kWp · +1% vs HP15
HP11 (Buckinghamshire)
≈3.9 km away
Local sunshine: ~981 kWh/kWp · +1% vs HP15
HP10 (Buckinghamshire)
≈5.4 km away
Local sunshine: ~993 kWh/kWp · +2% vs HP15
HP12 (Buckinghamshire)
≈5.7 km away
Local sunshine: ~987 kWh/kWp · +1% vs HP15
HP9 (Buckinghamshire)
≈6.7 km away
Local sunshine: ~984 kWh/kWp · +1% vs HP15
HP14 (Buckinghamshire)
≈8.0 km away
Local sunshine: ~986 kWh/kWp · +1% vs HP15

Similar sunshine across the UK

BT30 (Newry, Mourne and Down)
~976 kWh/kWp · +0% vs HP15
DN31 (North East Lincolnshire)
~976 kWh/kWp · +0% vs HP15
PL18 (Cornwall)
~976 kWh/kWp · +0% vs HP15