Cornwall has roughly 13,000 holiday let properties, from converted barns in the Lizard to terraced cottages in St Ives to luxury coastal homes in Rock and Polzeath. Many have strong solar potential: south-facing roofs, peak occupancy in May-September matching peak solar generation, and high guest electricity consumption (hot tubs, EV charging, summer cooking). Solar fits the profile remarkably well. But the April 2025 abolition of the Furnished Holiday Let (FHL) tax regime changed the tax landscape. Here's the honest 2026 analysis - including a worked case study on a 6 kWp system on a typical Cornwall coastal cottage let.
The April 2025 FHL regime abolition - what changed
The Furnished Holiday Let tax regime was abolished from 1 April 2025 (Corporation Tax) and 6 April 2025 (Income Tax). Pre-2025 changes:
- FHL properties were treated as a trade for tax purposes
- Capital allowances could be claimed on furniture, equipment, AND solar PV / batteries
- Full mortgage interest was deductible from rental income
- Business Asset Disposal Relief (BADR) gave 10% CGT on sale
Post-April 2025 changes:
- FHLs treated as standard residential property businesses
- Capital allowances no longer claimable on new expenditure - this includes new solar installs
- Mortgage interest restricted to a 20% tax credit (not full deduction)
- BADR no longer applies on sale
So is holiday let solar still worth it?
Yes, just not as a tax shelter. The case rests on:
- Direct electricity bill reduction
- Smart Export Guarantee income
- EV charger draw for guests with EVs (massive growth segment)
- Marketing value - "eco" credentials drive premium pricing
- EPC band upgrade - holiday lets need EPC C from 2028 under proposed MEES rules
- 0% VAT until March 2027 for residential solar (FHL properties still count as residential)
The summer-peak alignment - why holiday lets are perfect for solar
Holiday lets have a unique consumption profile:
- Peak occupancy: late May to early September (school holidays + bank holidays)
- Peak electricity consumption: hot tubs running constantly, EV charging, summer kitchen use, air-con on luxury lets, lighting until late
- Peak generation: same period - May-August accounts for 55% of annual Cornwall solar yield
This alignment is unusual. Most domestic solar struggles with self-consumption because generation peaks in summer when household demand is moderate. Holiday lets have demand that scales with solar generation. Self-consumption rates of 65-85% are achievable - much higher than the 25-40% typical of domestic owner-occupied.
Worked case study: 6 kWp on a 3-bed coastal cottage near Padstow
Real Cornwall holiday let, peak-season weekly let rate £1,800-£2,400, off-peak £800-£1,200, ~32 weeks let per year typical.
The installation
- 6 kWp south-west facing roof (450W panels, 14 panels)
- GivEnergy hybrid inverter
- 10 kWh battery storage
- Solar-aware EV charger (Zappi or GivEnergy AC charger)
- Bird mesh (essential coastal Padstow)
- Total install: £15,500 with 0% VAT
Annual electricity profile
| Item | kWh/year |
|---|---|
| Total property electricity consumption | 9,500 |
| Solar generation (6 kWp x 1,020 yield) | 6,120 |
| Solar used directly (self-consumption 70%) | 4,280 |
| Solar exported via SEG | 1,840 |
| Grid import (consumption - self-consumed) | 5,220 |
| EV charging by guests (estimate 25 sessions/year) | +600 kWh (recharged from solar 80%) |
Annual financial benefit
- Saved imports: 4,280 kWh x 28p = £1,198
- SEG income: 1,840 kWh x 15p = £276
- EV charging income (£0.45/kWh charged to guests on £30 session avg, 25 sessions): £750 (offsetting ~£170 of cost)
- Battery time-of-use arbitrage (Octopus Flux similar): £250-£350
- Total annual benefit: £1,994 - £2,094
Payback
- £15,500 / £2,044 = 7.6 years
- Faster than typical owner-occupied home solar (8-12 years) because of higher self-consumption
Marketing premium
Cornwall holiday let booking platforms (Sykes, Cornish Cottages, Classic Cottages) increasingly highlight "EV charger available" and "eco-friendly" as filter options. Properties with solar + EV charger booking premiums seen in 2025: £30-£75/week. Across 32 weeks = £960-£2,400/year additional revenue. This is the real holiday let solar story post-2025 - not the tax angle, but the booking advantage. See Let Management Cornwall for more on holiday let marketing.
EV charger integration - the holiday let differentiator
UK EV ownership hit ~24% of new car sales in 2025. Guests increasingly expect EV charging. Solar-aware EV chargers (Zappi, GivEnergy AC, Tesla Wall Connector v3) prioritise solar surplus over grid power:
- Day arrivals at 4-5pm with battery near full and solar still generating - charging into the car at 0p marginal cost
- Evening top-ups via cheap overnight tariff if needed
- Guest charges 30-50p/kWh to the EV (revenue), property pays solar 0p or grid 7p (overnight tariff)
Revenue per charging session typically £15-£35. 20-40 sessions/year achievable in peak season. Net £400-£900 contribution to ROI on top of solar savings. See EV Charger Cornwall for charger options and installer connections.
Hot tubs - the holiday let cost villain
A typical 4-person hot tub runs at 1.5-3 kWh/day in summer (maintaining 38°C) and 4-8 kWh/day in winter. Annualised: 1,500-2,500 kWh/year. At 28p that's £420-£700/year. Solar-direct charging the hot tub during daytime running cycles can displace 40-60% of this. The marketing line "solar-powered hot tub" works for premium bookings too.
EPC compliance - the hidden upgrade driver
Holiday lets are subject to MEES (Minimum Energy Efficiency Standards). From 2028 (proposed - subject to legislation), all rented residential properties including FHLs must be EPC band C or above. Many older Cornish granite or slate cottages with limited insulation sit at band D or E. Solar PV adds 5-15 points to the EPC score, often enough to push from D to C. Combined with insulation upgrades, can take an E-band property to C without rewiring or rebuilding.
Properties failing the 2028 standard can't be let until upgraded. Solar is one of the cheaper paths to compliance.
Cornwall-specific holiday let solar gotchas
- Cleaning between bookings - holiday lets are often empty Sat-Sat with hand-over Saturdays. Solar maintenance has to fit around this
- Guest abuse of free-feeling electricity - "they pay for the cottage, why not run the hot tub 24/7" - some owners now meter EV charging separately and bill
- Battery management - guests don't manage timed export windows. Set the system to maximise self-consumption rather than expecting smart tariff arbitrage
- WiFi-dependent monitoring - many remote Cornish cottages have flaky internet. Use 4G-fallback monitoring
- Storm exposure - many holiday lets are coastal. Mounts must be wind-rated; bird mesh essential. See bird-proofing
- Conservation areas - many premier Cornish holiday let villages (Mevagissey, Padstow, St Ives) are conservation areas. Planning permission likely needed - see our planning guide
Off-mains drainage holiday lets - the septic tank angle
Many rural Cornish holiday lets are off-mains for both electricity grid stability and drainage. Solar + battery dramatically improves resilience during summer power cuts (common in storm season). Properties on septic tanks should plan electrical loads carefully - if you have an electric pump for septic effluent treatment, solar diversion during the day saves on electricity bills and improves system uptime. See Septic Tank Cornwall for related rural utility advice.
The 2026 verdict on holiday let solar
Worth doing for most Cornish holiday lets, especially those with:
- South or west-facing roof orientation
- High summer occupancy and electricity use
- Hot tub or EV charger demand
- Current EPC band D, E, or F (compliance pressure)
- Long-term ownership horizon (5+ years)
Less compelling for:
- Short hold expected before sale (capital allowances no longer accelerating return)
- North or heavily shaded roof
- Lightly let properties (under 20 weeks/year)
- Properties already at EPC band B or A
Need three Cornwall solar quotes specifically priced for holiday let properties? Submit your postcode - we'll connect you with installers who understand the holiday let economics.
Frequently asked questions
Can holiday lets still claim solar tax relief?
Not on new installs after 1 April 2025 (companies) / 6 April 2025 (individuals). The Furnished Holiday Let regime abolition removed capital allowance claims on new expenditure. Existing solar pools claimed pre-2025 continue. Standard residential property income tax rules now apply.
What's the payback on solar for a Cornwall holiday let?
Typically 6-9 years - faster than owner-occupied homes (8-12 years) because of higher self-consumption rates (65-85% vs 25-40%). Coastal premium let properties with EV charger integration can hit 6-7 year payback.
Does solar improve holiday let bookings?
Yes, increasingly. "EV charger available" and "eco-friendly" filters on Sykes, Cornish Cottages, Classic Cottages, etc. drive booking premium of £30-£75/week. Across 30+ weeks let per year that's £900-£2,400 extra revenue.
Will solar help me meet 2028 EPC band C requirement?
Often yes. Solar PV adds 5-15 points to the EPC score, often enough to push a band D property to C. Combined with insulation, can lift band E to C. From 2028 proposed MEES rules, rented residential including FHLs must be band C+ to let.
Should I include EV charging for guests?
Strongly recommended in 2026. ~24% of new UK cars sold are EVs; the share is rising. Solar-aware chargers (Zappi, GivEnergy, Tesla) prioritise free solar. Revenue per session £15-£35; 20-40 sessions/year achievable. Net contribution £400-£900/year on top of standard solar savings.
What about VAT?
FHL properties count as residential for VAT purposes; the 0% VAT on solar (in force until 31 March 2027) applies. VAT-registered FHL operators don't recover VAT separately - the 0% rate is the relief route.
What about cleaning between bookings?
Solar PV needs cleaning every 2-3 years typically. Schedule with the changeover cleaner during a weekday gap, not Saturday turnover. See our cleaning cost guide. Coastal salt and gull activity may push cleaning frequency up.
Can guests damage solar equipment?
Rarely. Panels are inaccessible from inside the property. The battery and inverter should be sited in a locked utility space or loft, not somewhere guests can reach. Monitoring apps run on owner's account, not guest WiFi.
Will solar affect my holiday let insurance?
Notify your insurer at install. Most holiday let insurance covers solar as building fabric. Some require MCS certificate to validate. Storm and theft cover should be confirmed - some policies exclude solar above a certain value.
Is solar a good marketing angle?
Yes - especially with EV charger combo. "Solar-powered, EV charging available, eco-friendly stay" performs well in Cornwall let marketing. Consider also displaying real-time generation data via a guest-facing dashboard - some owners report bookings repeat-rate uplift from the novelty factor.