Solar Panels for Holiday Lets: Tax Changes, Costs, and Whether It Still Makes Sense

If you own a UK holiday let, the solar conversation has changed significantly since April 2025. The tax advantages that made solar a near-automatic decision for Furnished Holiday Let (FHL) owners no longer exist. But the operational case — lower running costs, stronger EPC rating, guest appeal — remains intact. This guide covers what's actually changed, what the numbers look like now, and how to think through whether solar still works for your property.

The Big Change: FHL Tax Regime Abolished April 2025

Before April 2025, the FHL regime gave qualifying holiday let owners access to:

• Annual Investment Allowance (AIA): up to £1 million of capital expenditure written off against rental income in the first year — meaning a £7,000 solar system could generate £2,800+ in immediate tax relief for a higher-rate taxpayer
• Business asset disposal relief on eventual sale, with a 10% CGT rate (now removed — gains on holiday lets are taxed at the standard residential CGT rate of 24%)
• Loss offset against other income

Under the standard rental income rules that now apply, solar is treated as a capital improvement. Capital improvements are not deductible as allowable expenses — only genuine revenue expenses (maintenance, repairs, management fees) qualify. You cannot offset the installation cost against your rental income in the year you install.

This does not mean solar is a bad idea for a holiday let. It means the decision now rests on the operational and running-cost case rather than the tax case.

How the Economics Work Now

The economics of holiday let solar have shifted from "tax-driven" to "running-cost driven." Here is what that looks like in practice.

Running costs are high. Holiday lets typically consume 3–4 times the electricity of a residential property. Hot tubs, electric heating, underfloor heating, multiple appliances running simultaneously — all add up. A 6-bedroom property sleeping 12 may use 30–50 kWh per day during peak season. At the current standard rate of around 24p/kWh, that is £7–£12 per day in electricity alone.

Self-consumption rates are unusually good. Holiday let guests occupy properties during the day — exactly when solar is generating. A commuter household might self-consume 25–35% of solar output because nobody is home during peak generation hours. A well-occupied holiday let can achieve 40–60% self-consumption. That gap is what makes the operational case compelling even without tax relief.

Example calculation: A 6 kWp system in a good UK location generates roughly 5,400 kWh per year. At 50% self-consumption (reasonable for a busy holiday let), that is 2,700 kWh saved at 24p/kWh — around £648 per year. Export of the remaining 2,700 kWh at around 5p/kWh (typical basic SEG rate) adds another £135. Total annual benefit: approximately £783.

At a system cost of £7,000–£9,000 for a 6 kWp installation, that gives a payback period of roughly 9–12 years — longer than the pre-2025 FHL calculation, but within the working life of a quality solar system (25+ years).

Self-Consumption vs Export: Occupancy Patterns Matter

Holiday lets have an unusual occupancy profile compared to residential homes, and this shapes how you should think about system sizing and tariff choice.

Peak season: High occupancy, high consumption, good solar alignment. Self-consumption is at its best during summer months when both generation and guest usage peak together.

Low season and void weeks: The property may be empty for days or weeks at a time. During these periods, solar output feeds entirely into export at SEG rates — typically 3.3–5.2p/kWh on a basic fixed tariff, or up to 15p/kWh on the best fixed-rate SEG deals. The economic case weakens during voids.

Sizing implications: Because of peak occupancy demand, holiday lets tend to need larger systems than a comparably sized residential home. The wiki guidance suggests adding 1–1.5 kWp per bedroom above a 2-bedroom baseline, and a further 1–2 kWp if there is a hot tub (which can draw 2–4 kW continuously). A 4-bedroom cottage with a hot tub might benefit from 6–8 kWp rather than the 3–4 kWp typical for a 4-bedroom home.

EPC Requirements and Future-Proofing

Holiday lets in England and Wales that are commercially let are generally required to have an EPC. As MEES obligations tighten — the 2030 standard aims for properties to meet a new dual-metric framework — solar is one of the most effective single measures for improving a SAP score.

A 4–6 kWp system typically adds 8–15 SAP points, which can shift a property by one to two EPC bands. For holiday lets currently rated D or E, this matters: future regulatory requirements may restrict or penalise lower-rated properties, and estate agents increasingly flag energy performance as a factor in property valuations.

Solar now is also a form of future-proofing against energy price rises. Running costs compound over time; a system installed today reduces exposure to electricity price increases over its entire life.

Practical Considerations: Management and Maintenance

Holiday let solar introduces operational questions that don't arise in the same way for a primary residence.

Who monitors the system? If you manage the property remotely, you need a way to know if the system stops working. Most modern inverters come with app-based monitoring that alerts you to faults or drops in output. This is worth confirming with your installer — remote monitoring is a practical necessity for unoccupied properties, not an optional extra.

What happens when the property is unoccupied? Systems continue generating during void periods. That electricity flows to export automatically. Ensure your SEG tariff is properly registered so you're receiving payment for it rather than exporting for free.

Maintenance responsibilities: Solar systems require minimal maintenance, but gutters near panels can cause shading, and panels benefit from occasional cleaning — particularly in rural locations where bird activity is higher. Budget around £100–£200 per year for cleaning and periodic inspection. Check whether your property insurance covers solar equipment; specialist holiday let insurance policies vary significantly in their treatment of solar.

Guest interaction: Guests do not need to manage anything. The system operates passively. If you have a battery (see below), ensure any physical controls are either locked or clearly labelled to avoid guests accidentally disabling the system.

Battery and Solar for Holiday Lets

Battery storage pairs particularly well with holiday lets for a few reasons beyond the standard residential case.

Off-grid appeal: Rural holiday lets increasingly market themselves on resilience and sustainability. A solar-plus-battery system can provide several hours of backup in the event of a grid outage — a genuine selling point for remote properties and an operational benefit if the area is prone to power cuts.

Hot tub efficiency: If the property has a hot tub, a battery can store solar generation during the day and use it to maintain the tub temperature overnight, reducing grid draw during peak evening hours.

Cost: A 5 kWh battery adds roughly £3,000–£4,500 to the installation cost; a 10 kWh unit runs £4,500–£6,500. The payback is harder to calculate than for the panels alone, but for holiday lets with high evening consumption or a grid reliability concern, the appeal is clear.

VAT: Still Zero-Rated Until 2027

One meaningful upfront saving remains: the 0% VAT rate on solar supply and installation applies until 31 March 2027. On a £7,500 supply-and-fit quote, this represents a saving of around £1,500 compared to the standard 20% VAT rate. After March 2027, the rate reverts to 5%.

If your holiday let is structured as a purely commercial enterprise rather than any form of residential property, the VAT position may differ from the standard residential treatment. A specialist VAT adviser can confirm your position before you proceed.

Is It Still Worth It?

The honest answer is: it depends on the property, and the decision is more marginal than it was before April 2025.

Solar is likely to make sense for a holiday let where:

• The property has high seasonal occupancy (self-consumption rates are strong)
• Electricity running costs are significant — particularly if there is a hot tub or electric heating
• The property has a suitable roof or ground-mount area
• You plan to hold the property for 10+ years (long enough for the payback to materialise)
• EPC improvement is needed or beneficial for regulatory or valuation reasons

Solar is less compelling where:

• Occupancy is low or very seasonal, meaning long void periods with export-only generation
• The property has a poor roof orientation or significant shading
• The ownership horizon is short (selling within 5–7 years)
• The upfront capital is needed elsewhere in the property

The loss of FHL tax treatment has shifted holiday let solar from an almost-automatic financial decision to one that needs to be evaluated on its own operational merits. Those merits are still real — unusually high self-consumption, meaningful running-cost reductions, EPC benefits, and guest appeal. They just need to carry the investment on their own now.

Get at least three quotes from MCS-certified installers and ask each to model the savings based on your actual occupancy profile and usage pattern. Speak to a tax adviser about your current position under the standard property rental rules, and consider whether battery storage makes sense given the property's location and how it is marketed.

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