Are commercial solar panels worth it for offices in 2026?

The short answer

For UK office buildings of 2,000 sqm or larger consuming >150 MWh/year at current commercial electricity rates, solar PV is almost always economically positive in 2026. Typical payback lands at 5-7 years on cash purchase, with system NPV over 25 years usually 5-7× the capex outlay.

The “almost always” rather than “always” caveat applies in five specific situations: north-shaded rooftops, severely structurally-constrained roofs, very short remaining lease terms (under 5 years) with no tenant green-lease provisions, buildings already due for major fabric upgrades that would conflict with PV install, and listed buildings where Heritage Consent risk is high.

For 90%+ of UK commercial offices, the answer is yes.

Worked-out economics across five building profiles

Profile 1: 1,500 sqm SME office, Manchester suburbs

Annual electricity: 380 MWh / £114k. System: 240 kWp. Capex: £216k. Annual saving: £58k. Payback: 3.7 years. 25-year NPV: £730k.

Profile 2: 5,000 sqm professional services HQ, Birmingham

Annual electricity: 1.2 GWh / £360k. System: 720 kWp. Capex: £576k. Annual saving: £180k. Payback: 3.2 years. 25-year NPV: £2.4m.

Profile 3: 12,000 sqm multi-let office, London (multi-let landlord install)

Annual electricity (landlord areas): 1.8 GWh / £540k. System: 950 kWp. Capex: £760k. Annual saving (service-charge recovery): £198k. Payback: 3.8 years. 25-year NPV: £2.9m.

Profile 4: 3,500 sqm coworking building, Edinburgh

Annual electricity: 850 MWh / £255k. System: 380 kWp. Capex: £342k. Annual saving: £106k. Payback: 3.2 years. 25-year NPV: £1.5m.

Profile 5: 25,000 sqm public-sector HQ, Cardiff (Salix PSDS-funded)

Annual electricity: 3.6 GWh / £1.08m. System: 1,800 kWp. Capex: £1.44m (100% PSDS-funded = £0 net). Annual saving: £356k. Payback: 0 years (grant-funded). 25-year NPV: £6.8m.

Why offices are particularly favoured

Three structural factors make office buildings more favourable for solar than warehouses, retail, or hospitality:

Demand profile alignment. Mon-Fri 8am-6pm pattern matches PV generation almost perfectly — self-consumption ratios of 70-85% without battery, vs 40-55% on warehouses.
High HVAC load in summer. Cooling demand peaks exactly when PV generation peaks. Self-consumption ratio rises further in summer.
MEES 2030 timing. 21% of UK office stock currently sub-EPC-B; landlord MEES compliance creates a powerful additional driver beyond pure ROI.

When the answer is “no”

There are situations where solar doesn’t make economic sense for an office. These include:

Severely shaded roofs. Buildings in dense city-centre canyons where multiple adjacent buildings block sunlight for 6+ hours of the typical day. Site survey will identify these.
Buildings due for demolition or major redevelopment within 5 years. Capex doesn’t pay back over short remaining building life.
Very short tenant lease with no landlord interest. Tenant install needs minimum 7-8 year remaining lease for cash payback; landlord install for service-charge recovery needs landlord engagement.
Buildings with already-failing roofs. PV install requires sound roof first. If the roof needs replacing in 2-3 years, integrate PV with the roof replacement; don’t install PV on a failing roof.

We turn down roughly 8% of incoming office solar enquiries because the economics don’t work. We’d rather lose the enquiry than deliver a poor-performing install.

Request a free feasibility study — we’ll be honest if your site doesn’t suit solar.