☀ Solar Panels for New Builds
New build solar PV cost guide — UK new build solar PV installation
2026 prices

New build solar PV cost guide

What does FHS-compliant solar PV cost on a new build? Indicative 2026 pricing for the five most common house types — comparing developer-volume to self-build retail.

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2026 indicative pricing

Developer-volume vs self-build retail

Bulk procurement, factory pre-fit and amortised SAP/HEM modelling cut per-plot cost by ~25%.

Developer (volume) Self-build (retail)
2-bed flat
2.8 kWp array
£4,550
£6,500
3-bed semi
3.4 kWp array
£5,200
£7,200
3-bed detached
4.0 kWp array
£5,850
£8,050
4-bed detached
5.2 kWp array
£7,000
£9,500
5-bed executive
7.6 kWp array
£9,300
£12,750

Mid-point of indicative 2026 ranges; includes panels, inverter, in-roof mounting, monitoring, MCS certification, SAP/HEM modelling and 20-year insurance-backed workmanship warranty. Battery, ASHP, MVHR and EV charger priced separately. Self-build retail includes 0% VAT on new dwellings.

Indicative 2026 prices by house type

Prices include panels, inverter, in-roof mounting, monitoring, MCS certification, SAP/HEM compliance pack and 20-year insurance-backed workmanship warranty. Battery, ASHP, MVHR and EV charger priced separately.

House type Ground floor Min kWp (40% rule) Developer volume Self-build retail
2-bed flat / terrace 35 m² 2.8 £4,200–£4,900 £5,600–£7,400
3-bed semi 42.5 m² 3.4 £4,800–£5,600 £6,200–£8,200
3-bed detached 50 m² 4.0 £5,400–£6,300 £7,000–£9,100
4-bed detached 65 m² 5.2 £6,200–£7,800 £8,500–£10,500
5-bed executive 95 m² 7.6 £8,400–£10,200 £11,500–£14,000

The full FHS package cost

Solar PV is one component of the FHS cost premium. The complete additional cost over a Part L 2021 home is about £4,350 per dwelling on national average — split roughly:

  • Air source heat pump system: £2,800 (less ~£900 gas boiler = net £1,900)
  • Solar PV array: £4,500–£7,000 (less ~£1,400 displaced legacy token PV = net £3,100–£5,600)
  • Enhanced fabric (walls, floor, roof): £1,200
  • MVHR: £2,800
  • Windows / doors upgrade: £600

Note the Impact Assessment uses retail benchmarks. Developer-volume costs are typically 20–30% lower across the package. Self-builders benefit from 0% VAT making the net retail price closer to the volume price.

How the homeowner recoups the cost

On a 3-bed semi with a 3.4 kWp array, 5 kWh battery and ASHP at 2026 tariffs:

  • Electricity bill saving: ~£950/year (86% reduction per Sunsave sample data)
  • ASHP efficiency vs gas: ~£250/year saving once gas standing charge is removed
  • SEG export tariff: ~£90/year on 6p/kWh export rate
  • Annual total saving: ~£1,290/year
  • FHS premium payback: ~3.4 years

Plus a property value uplift of 2–7% on the home itself (£6,500–£22,750 on a £325k median new build) — typically 1.5–5× the FHS cost premium.

Frequently asked questions

How much does solar PV cost on a new build?
For a typical 3-bed semi at 42.5 m² ground floor (3.4 kWp FHS minimum), in-roof solar runs £4,800–£5,600 on volume sites and £6,200–£8,200 on self-build. A 4-bed detached needs 5.2 kWp at £6,200–£7,800 volume / £8,500–£10,500 self-build. A 5-bed executive needs 7.6 kWp at £8,400–£10,200 volume / £11,500–£14,000 self-build.
Why is volume pricing cheaper than self-build retail?
Three reasons: bulk panel/inverter procurement (15–25% lower), factory pre-fit reducing site labour (£800–£1,200 saving), and the SAP/HEM modelling amortised across many plots rather than charged per project.
What does the £4,350 FHS premium per Government data cover?
The figure is the all-in FHS uplift — PV + ASHP + insulation + MVHR + windows/doors, minus the gas boiler displaced. On a typical 3-bed it breaks down: ~£3,100 net solar PV, ~£1,900 net heat pump, ~£600 windows/doors uplift, ~£800 fabric uplift, ~£2,800 MVHR. Average national £4,350.
Does 0% VAT apply to new build solar?
Yes. Under VAT Notice 708, construction of a new dwelling is zero-rated. This includes solar PV, in-roof mounting, inverter, and labour. Self-builders see this as an immediate ~17% saving versus retrofit retail pricing.
When does battery storage make economic sense?
On almost every new build under FHS. Adding a 5 kWh battery for ~£3,000 lifts self-consumption from ~30% to 70%+, materially improves the HEM Dwelling Emission Rate, and saves ~£250–£400/yr in additional bill reduction. Payback 8–12 years.
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