2026 cost guide

Solar panel cost on a 5-bed new build

The 7.6 kWp FHS-required array for a typical 5-bed executive home. Volume developer pricing, self-build retail pricing, and the case for adding 16 kWh battery and EV charging.

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5-bed new builds — the upper end of volume housebuilder catalogues and the majority of architect-led self-build work — need the largest FHS-required solar arrays. Typical 7.6 kWp arrays produce more electricity than the household consumes during summer months, making battery storage and EV charging integration valuable for capturing the surplus. This page covers the full FHS package pricing across both volume and self-build procurement routes.

Volume developer pricing — 5-bed executive (7.6 kWp)

Item	Cost
18 × 425W mono panels (Q CELLS / LONGi)	£2,700
8 kW hybrid inverter	£1,200
In-roof mounting (larger area)	£890
Installation labour	£680
Cabling, monitoring, EV pre-fit	£420
MCS, commissioning, warranty	£380
Total PV — developer volume	£6,270

Self-build retail — 5-bed (7.6 kWp + 16 kWh battery + EV charger)

Item	Cost
18 × 425W premium panels	£3,780
10 kW hybrid inverter with optimisers	£2,100
In-roof premium mounting	£1,080
Installation labour (premium)	£1,650
Cabling, monitoring, custom integration	£580
SAP/HEM, MCS, project management	£780
Subtotal — PV only	£9,970
16 kWh battery (Tesla Powerwall 3 or GivEnergy 16.4)	£6,500
Zappi v2 7 kW EV charger (solar-aware)	£1,400
Total — self-build (0% VAT applied)	£17,870

Annual savings for a 5-bed household

5-bed households use significantly more electricity than smaller homes: typical 14,000-16,000 kWh/yr with ASHP heating, electric cooking, 2 EVs (24,000 miles combined), and home office equipment. A 7.6 kWp south-facing array generates ~7,200 kWh/yr in the South Midlands — covering roughly half of household annual consumption.

Scenario	Self-consumed	Exported	Annual £ benefit
7.6 kWp PV alone	3,960 kWh	3,240 kWh	£1,130
7.6 kWp + 16 kWh battery	5,400 kWh	1,800 kWh	£1,330
7.6 kWp + 16 kWh + EV solar-divert	6,120 kWh	1,080 kWh	£1,440

PV-only payback on a £6,270 volume developer install: 5.5 years. Self-build with battery and EV charger (£17,870): 12.4 years simple payback — recovered well within the 25-year panel performance warranty period.

For other sizes: 3-bed · 4-bed. Full breakdown: cost guide.

40% of ground floor area

PV / ground floor area

Mar 2027

FHS in force

75%

CO₂ vs 2013 baseline

£4,350 per dwelling

Per-plot premium (2025 prices, FHS Impact Assessment)

For developers and housebuilders

5-bed new build solar PV on volume new-build programmes

On a multi-plot programme, settle four things at procurement: the per-plot price and how it moves with inflation; whether the array is modelled in the SAP 10.3 calculation for every house type; what your structural warranty provider needs to see for roof-integrated PV; and who issues the MCS certificate at handover, since buyers need it to claim Smart Export Guarantee payments.

Developer guide →

For self-builders and architects

5-bed new build solar PV for one-off custom builds

On a one-off build the array is easiest to settle at RIBA Stage 2 or 3, while the roof geometry is still open. Your SAP assessor models the system for the Part L submission, your building control body signs it off, and PV installed as part of constructing a new dwelling is zero-rated for VAT under HMRC Notice 708.

Self-build guide →

How this fits into the FHS compliance pathway

Every FHS-compliant new build passes three regulatory gates. 5-bed new build solar PV sits mainly in the second, design-stage Part L compliance, but it affects building control sign-off and the handover documents too:

1
Planning permission Solar PV designed into a new dwelling is normally covered by the dwelling's own planning permission. Conservation areas, Article 4 directions and plots within the curtilage of a listed building need extra planning evidence, usually prepared by the architect or planning agent.
2
Building control: Part L compliance SAP 10.3 is the compliance calculation at FHS launch. The dwelling's emission and primary energy rates must meet their targets, with the PV array, heat pump, fabric U-values and air permeability all entered. The SAP assessor prepares the design-stage and as-built calculations that building control reviews.
3
Completion: certificates and handover The MCS certificate (needed for Smart Export Guarantee payments), the Energy Performance Certificate and the homeowner's handover documents. If your structural warranty provider has requirements for roof-integrated PV, confirm them before the roof goes on.

For a fuller walkthrough of the compliance process, see the Part L 2026 guide and the FHS PV calculator, which sizes a compliant array from your ground floor area.

FAQ — 5-bed solar cost

How big does the solar array need to be on a 5-bed?

A typical 5-bed executive new build has 200-240 m² total floor area with 85-110 m² ground floor. At FHS 40% PV coverage that's 34-44 m² of panel area — typically 16-20 panels totalling 6.8-8.4 kWp. Most 5-bed plans accommodate the larger array on a single south-facing roof pitch; a small number of asymmetric house types need east-west split arrays.

Is 7.6 kWp generation actually useful for a 5-bed household?

Yes — 5-bed households consume materially more electricity than smaller homes. Typical 5-bed annual consumption with ASHP heating, electric cooking, 2 EVs and home office equipment: 14,000-16,000 kWh. A 7.6 kWp array generates ~7,200 kWh/yr in the South Midlands. Even with a 13-16 kWh battery, self-consumption rarely exceeds 75% because household demand exceeds generation. Net result: low export, high household offset.

Does the larger PV need a 3-phase grid connection?

Above 11.04 kWp (16A per phase) most DNOs require a 3-phase connection. A 7.6 kWp array is comfortably within single-phase limits. The DNO grid connection notification (G99) is filed by us; no separate application from the homeowner is required. For installations near the 11 kWp limit a 3-phase inverter may be specified anyway to support future EV charger expansion.

FHS in force from 24 March 2027

Get a quote for FHS-compliant solar

Share your plot details and a solar installer can price a system sized to the Part L 2026 notional dwelling, with PV area equal to 40% of the ground floor area. There is no obligation to go ahead.

✓ Sized to the 40% ground-floor-area rule
✓ For developer programmes and one-off self-builds
✓ Check any installer against the MCS register before you sign

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