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Solar panel cost in Guildford (GU5)

See realistic solar installation costs, savings and payback for GU5 (Guildford) 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
£997
What you save every year
Profit Over 25 Years
£15,152
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 997 kWh/kW — 32 below the regional median (1029).

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 997 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)
997 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: £831, 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 1993 kWh 797 kWh 1196 kWh £213 £120 £332 £3,256 9.8 yrs £3,389
3 kW 2990 kWh 1196 kWh 1794 kWh £319 £179 £498 £4,883 9.8 yrs £5,084
4 kW 3987 kWh 1595 kWh 2392 kWh £425 £239 £664 £6,511 9.8 yrs £6,779
5 kW 4983 kWh 1993 kWh 2990 kWh £532 £299 £831 £8,139 9.8 yrs £8,474
6 kW 5980 kWh 2392 kWh 3588 kWh £638 £359 £997 £9,767 9.8 yrs £10,168
7 kW 6977 kWh 2791 kWh 4186 kWh £744 £419 £1,163 £11,394 9.8 yrs £11,863
8 kW 7973 kWh 3189 kWh 4784 kWh £851 £478 £1,329 £13,022 9.8 yrs £13,558

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: £997, Upfront: £10,239, Break-even: 10.3 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1993 kWh 1196 kWh 797 kWh £319 £80 £399 £5,356 13.4 yrs £2,619
3 kW 2990 kWh 1794 kWh 1196 kWh £478 £120 £598 £6,983 11.7 yrs £4,978
4 kW 3987 kWh 2392 kWh 1595 kWh £638 £159 £797 £8,611 10.8 yrs £7,337
5 kW 4983 kWh 2990 kWh 1993 kWh £797 £199 £997 £10,239 10.3 yrs £9,697
6 kW 5980 kWh 3588 kWh 2392 kWh £957 £239 £1,196 £11,867 9.9 yrs £12,056
7 kW 6977 kWh 4186 kWh 2791 kWh £1,116 £279 £1,395 £13,494 9.7 yrs £14,415
8 kW 7973 kWh 4784 kWh 3189 kWh £1,276 £319 £1,595 £15,122 9.5 yrs £16,775

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: £1,080, 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 1993 kWh 1395 kWh 598 kWh £372 £60 £432 £6,756 15.6 yrs £1,883
3 kW 2990 kWh 2093 kWh 897 kWh £558 £90 £648 £8,383 12.9 yrs £4,575
4 kW 3987 kWh 2791 kWh 1196 kWh £744 £120 £864 £10,011 11.6 yrs £7,266
5 kW 4983 kWh 3488 kWh 1495 kWh £930 £150 £1,080 £11,639 10.8 yrs £9,958
6 kW 5980 kWh 4186 kWh 1794 kWh £1,116 £179 £1,296 £13,267 10.2 yrs £12,650
7 kW 6977 kWh 4884 kWh 2093 kWh £1,302 £209 £1,512 £14,894 9.9 yrs £15,341
8 kW 7973 kWh 5581 kWh 2392 kWh £1,489 £239 £1,728 £16,522 9.6 yrs £18,033

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: £1,105, 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 1993 kWh 1455 kWh 538 kWh £388 £54 £442 £8,506 19.2 yrs £333
3 kW 2990 kWh 2183 kWh 807 kWh £582 £81 £663 £10,133 15.3 yrs £3,124
4 kW 3987 kWh 2910 kWh 1076 kWh £776 £108 £884 £11,761 13.3 yrs £5,915
5 kW 4983 kWh 3638 kWh 1346 kWh £970 £135 £1,105 £13,389 12.1 yrs £8,706
6 kW 5980 kWh 4365 kWh 1615 kWh £1,164 £161 £1,326 £15,017 11.3 yrs £11,498
7 kW 6977 kWh 5093 kWh 1884 kWh £1,358 £188 £1,547 £16,644 10.8 yrs £14,289
8 kW 7973 kWh 5821 kWh 2153 kWh £1,552 £215 £1,768 £18,272 10.3 yrs £17,080

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: £1,121, 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 1993 kWh 1495 kWh 498 kWh £399 £50 £449 £10,256 22.9 yrs £-1,284
3 kW 2990 kWh 2243 kWh 748 kWh £598 £75 £673 £11,883 17.7 yrs £1,573
4 kW 3987 kWh 2990 kWh 997 kWh £797 £100 £897 £13,511 15.1 yrs £4,431
5 kW 4983 kWh 3738 kWh 1246 kWh £997 £125 £1,121 £15,139 13.5 yrs £7,289
6 kW 5980 kWh 4485 kWh 1495 kWh £1,196 £150 £1,346 £16,767 12.5 yrs £10,147
7 kW 6977 kWh 5233 kWh 1744 kWh £1,396 £174 £1,570 £18,394 11.7 yrs £13,004
8 kW 7973 kWh 5980 kWh 1993 kWh £1,595 £199 £1,794 £20,022 11.2 yrs £15,862

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: £1,138, Upfront: £17,589, Break-even: 15.5 yrs
System Annual output Self-use Exported Bill saving Export income Annual benefit Upfront cost Break-even 20-year net
2 kW 1993 kWh 1535 kWh 458 kWh £409 £46 £455 £12,706 27.9 yrs £-3,602
3 kW 2990 kWh 2302 kWh 688 kWh £614 £69 £683 £14,333 21.0 yrs £-677
4 kW 3987 kWh 3070 kWh 917 kWh £819 £92 £910 £15,961 17.5 yrs £2,247
5 kW 4983 kWh 3837 kWh 1146 kWh £1,023 £115 £1,138 £17,589 15.5 yrs £5,171
6 kW 5980 kWh 4605 kWh 1375 kWh £1,228 £138 £1,366 £19,217 14.1 yrs £8,095
7 kW 6977 kWh 5372 kWh 1605 kWh £1,433 £160 £1,593 £20,844 13.1 yrs £11,019
8 kW 7973 kWh 6139 kWh 1834 kWh £1,637 £183 £1,821 £22,472 12.3 yrs £13,944

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 Guildford

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 GU5

Figures below are tailored to GU5 — click through for full league tables.

Big-Roof Britain Rank #101 of 2182
6.6 kWp (UK avg 5.1 kWp)
~14 panels (≈430 W)
Solar Payback Index Rank #624 of 2996
9.8 years (UK avg 10.8 years)
~£997 /yr • £9,767 upfront
Standing-Charge Drag Rank #546 of 2996
20.0% (UK avg 26.6%) drag on savings
£199 fixed • ~£997 /yr value
Aspect Penalty View ranking →
East −20.7% West −20.1%
Typical output loss versus a south-facing roof (lower is better)

Seasonal solar output in GU5

Monthly generation per kilowatt of solar panels

kWh 39 Jan 51 Feb 85 Mar 112 Apr 119 May 121 Jun 123 Jul 109 Aug 93 Sep 66 Oct 45 Nov 34 Dec
Best month Worst month Winter (Dec–Feb) Other months

Winter output: 49.8% 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 41 kWh per month; the average month produces around 83 kWh. So a typical 4 kW home system would generate roughly 165 kWh in winter, or 332 kWh in an average month.

Your Area at a Glance

Your Electricity Rate
26.67p/kWh
Daily Fixed Charge
54.45p/day
Local Sunshine
997kWh/kW
A 1 kW system generates ~997 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: 74% • Flats: 12% • Bungalows: 12% Based on 2,555 properties

Coverage

Guildford (55%)|Waverley (45%)

Areas Covered

Bramley & Wonersh, Tillingbourne, Stoke, Shalford, Cranleigh East, Cranleigh West

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

GU4 (Guildford)
≈5.3 km away
Local sunshine: ~987 kWh/kWp · -1% vs GU5
GU1 (Guildford)
≈5.6 km away
Local sunshine: ~997 kWh/kWp · +0% vs GU5
GU2 (Guildford)
≈6.4 km away
Local sunshine: ~994 kWh/kWp · -0% vs GU5
GU6 (Waverley)
≈7.3 km away
Local sunshine: ~1,021 kWh/kWp · +2% vs GU5
GU3 (Guildford)
≈7.9 km away
Local sunshine: ~999 kWh/kWp · +0% vs GU5
KT24 (Guildford)
≈10.3 km away
Local sunshine: ~997 kWh/kWp · +0% vs GU5

Similar sunshine across the UK

NN15 (North Northamptonshire)
~997 kWh/kWp · +0% vs GU5
NP18 (Newport)
~997 kWh/kWp · +0% vs GU5
EX16 (Mid Devon)
~997 kWh/kWp · -0% vs GU5