The UK Solar Postcode Lottery: Installed Costs Vary by £1,200 Depending on Where You Live

Where you live in the UK has a measurable and often overlooked effect on what you pay to go solar — and how quickly you get your money back. We modelled a 10-panel, 4.45 kWp N-Type TOPCon system (Canadian Solar TopHiku6 445W panels, Fox F3-6000 3.6kW inverter, standard pitched-roof mounting) across 12 UK regions using real labour survey data, PVGIS v5.2 irradiance figures, and Ofgem's Q2 2026 price cap. The result: installed costs span £2,796 to £3,996 — a £1,200 gap — with payback periods ranging from 3.9 years in the South East to 5.5 years in Greater London.

This is the UK solar postcode lottery in numbers.

The headline findings

The gap between the best- and worst-case regions is not trivial:

Cost spread: £1,200 on a like-for-like 4.45 kWp system (same panels, same inverter, same mounting hardware).
Payback spread: 1.6 years between the fastest-payback region (South East, 3.9 yrs) and the slowest (Greater London, 5.5 yrs).
Best region: South East — highest irradiance in our dataset (4,262 kWh/year), competitive labour costs (£2,000), annual saving of £822.
Worst payback: Greater London — premium labour (£2,800) pushes the total to £3,996 despite decent generation (3,786 kWh/year).
Average annual saving across all 12 regions: £705.

The hardware cost is fixed: £1,196 for panels, inverter, and mounting hardware. Every penny of regional variation comes from labour. That means your postcode directly determines your payback period — not through your roof's angle or your energy consumption, but through what electricians and MCS-certified installers charge in your area.

Solar-only regional league table

Ranked by payback period (fastest first). All figures assume a south-facing roof, 14% PVGIS system losses, 45% self-consumption without battery, and a modelled electricity price of 24.5p/kWh — in line with the Ofgem Q2 2026 price cap (24.67p/kWh including VAT) — plus 15p/kWh SEG for exported electricity.

Region	Installed cost	Annual generation	Annual savings	Payback
South East	£3,196	4,262 kWh	£822	3.9 yrs
East of England	£2,996	3,780 kWh	£729	4.1 yrs
East Midlands	£2,896	3,665 kWh	£706	4.1 yrs
Wales	£3,096	3,819 kWh	£736	4.2 yrs
South West	£3,396	4,079 kWh	£786	4.3 yrs
West Midlands	£2,996	3,585 kWh	£691	4.3 yrs
Yorkshire	£2,896	3,467 kWh	£668	4.3 yrs
North East	£2,796	3,410 kWh	£657	4.3 yrs
North West	£2,996	3,319 kWh	£640	4.7 yrs
Northern Ireland	£3,196	3,384 kWh	£652	4.9 yrs
Scotland	£3,296	3,312 kWh	£638	5.2 yrs
Greater London	£3,996	3,786 kWh	£730	5.5 yrs

Note that Greater London's 3,786 kWh annual generation is actually above the 12-region average — London is not a bad location for solar irradiance. The long payback period is driven entirely by the premium labour market, not by sunlight.

Browse the solar panels used in this study — including the Canadian Solar TopHiku6 445W — or see the full products catalogue for inverters and batteries.

Adding a battery: does it change the regional picture?

A Pylontech US5000 5kWh battery adds £788 to the system cost in every region (hardware is the same everywhere). Adding battery storage raises self-consumption from 45% to 78%, increasing the share of generated electricity you use directly rather than exporting at the lower SEG rate. The battery makes economic sense in every region, but the regional spread in payback period narrows slightly.

Region	Installed cost (with battery)	Annual savings (with battery)	Payback (with battery)
South East	£3,984	£955	4.2 yrs
East of England	£3,784	£847	4.5 yrs
East Midlands	£3,684	£821	4.5 yrs
Wales	£3,884	£856	4.5 yrs
South West	£4,184	£914	4.6 yrs
West Midlands	£3,784	£803	4.7 yrs
Yorkshire	£3,684	£777	4.7 yrs
North East	£3,584	£764	4.7 yrs
North West	£3,784	£744	5.1 yrs
Northern Ireland	£3,984	£758	5.3 yrs
Scotland	£4,084	£742	5.5 yrs
Greater London	£4,784	£848	5.6 yrs

With battery storage, the annual saving increase is meaningful: the South East gains an additional £133/year over solar-only (£955 vs £822), narrowing the incremental payback on the £788 battery add-on to roughly 0.3 years in the best case. Every region benefits from the battery in cash-flow terms. The battery pays for itself in less than one additional year of operation in all but the worst-case scenarios. You can see the Pylontech US5000 and other battery options in our products catalogue.

Why labour varies so much

The entire £1,200 cost spread in this study comes from one line item: installation labour. Hardware — panels, inverter, mounting rails, cables, and fixings — costs the same wherever you buy it. The regional variation in labour reflects structural differences in the UK skilled-trades market.

Demand pressure. London and the South East have consistently high demand for MCS-certified solar installers, which drives up day rates. A two-person crew installing a 10-panel system in Brighton or London commands a meaningfully different daily rate than the same job in Newcastle or Leeds.

Cost of living for tradespeople. Business overheads — van costs, insurance, workshop space, training — track the local cost of living. An Edinburgh or London-based installer's fixed costs are higher than those of a Manchester or Leicester equivalent, and those costs show up in quotes.

Travel and logistics. Urban density and traffic affect job throughput. An installer who can complete two jobs per day in a compact city might only fit one in a dispersed rural area, effectively doubling the per-job labour allocation.

The North East anomaly. Despite a higher cost of living than Yorkshire or East Midlands, Greater London's labour premium is uniquely high — nearly double the North East's £1,600. This reflects the capital's position as an outlier in the UK labour market, not a smooth regional gradient.

The implication is clear: getting multiple quotes from installers in your area is not just good practice — in high-labour regions it can save you hundreds of pounds. A South East installer quoting £3,196 installed might be competitive; the same quote in Newcastle would be well above market rate.

What this means for your install decision

If you are in the South East, East of England, or East Midlands, the maths are compelling: a 4.45 kWp system pays back in under 4.2 years and generates the strongest annual savings. You have a near-ideal combination of irradiance and labour costs.

If you are in Greater London, Scotland, or Northern Ireland, solar still makes strong financial sense — a 5.5-year payback on a system with a 25-year life expectancy is excellent — but you should be especially diligent about comparing installer quotes, since labour is where the margin for overpayment is highest. Get at least three quotes and check MCS certification for each.

Wherever you are, the Smart Export Guarantee means you are paid for every unit you export. At the 15p/kWh rate modelled here, exported electricity materially reduces payback across all regions. See our guide to the Smart Export Guarantee for how to register and which suppliers pay the best rates.

Adding battery storage is worth considering in every region studied. The incremental payback on the battery (£788) is under two years in most cases when you account for the higher self-consumption rate (45% → 78%). In practical terms, a battery converts more of your own generation into bill savings rather than letting it trickle out to the grid at export rates.

Ready to see what a system would cost for your roof and postcode? Use our Solar Planner to get a personalised estimate — it uses the same PVGIS irradiance data and regional labour benchmarks as this study.

Methodology

This study models a fixed system specification across 12 UK regions. The system comprises 10 × Canadian Solar TopHiku6 445W N-Type TOPCon panels (4.45 kWp), a Fox F3-6000 3.6kW hybrid inverter, and standard pitched-roof rail mounting. Hardware cost is fixed at £1,196 across all regions.

Regional labour costs are based on published installer survey data and market benchmarks from Which? (2025) and the Energy Saving Trust. PVGIS v5.2 annual irradiance figures are used for representative cities in each region (Brighton, Norwich, Leicester, Cardiff, Plymouth, Birmingham, Leeds, Newcastle, Manchester, Belfast, Edinburgh, London), with 14% system loss applied. Annual savings are computed using a representative electricity price of 24.5p/kWh — broadly in line with the Ofgem Q2 2026 price cap (24.67p/kWh including VAT, GB average) — and a Smart Export Guarantee rate of 15p/kWh, with 45% self-consumption assumed for solar-only and 78% with battery storage. The same electricity price is applied to every region for a like-for-like comparison; Northern Ireland sits outside the GB price cap (it has a separate energy market) but is modelled on the same basis for consistency. Battery add-on cost is fixed at £788 (Pylontech US5000). Payback is calculated as total installed cost divided by annual saving. No degradation or tariff escalation adjustments are applied; actual payback may differ.

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