Is installing solar panels on investment properties worth the bother?
Different thinking applies to splashing out thousands on energy efficiency improvements for buy-to-let homes, houses in multiple occupation and short-term lets than spending the cash on your own home.
The incentives are different because the landlord pays the capital outlay, but the tenant often reaps the immediate reward of lower energy bills.
Arguments for solar panels on BTLs
- Attracting and retaining tenants: Energy efficiency is increasingly high on renters' priority lists. Properties with lower projected utility bills stand out in competitive markets, potentially reducing void periods and attracting eco-conscious or budget-conscious tenants.
- Commanding higher rent: Properties featuring lower ongoing living costs can sometimes justify a modest rent premium, though this depends on local tenant demand.
- Future-proofing against regulation: Energy efficiency standards for rental properties, such as Energy Performance Certificates, are becoming stricter. Upgrading to solar panels can drastically improve an EPC rating, protecting the property from future regulatory restrictions on renting out sub-par properties.
- Property price impact: Owned solar systems generally boost the overall resale value of a property.
Arguments against solar panels on BTLs
- The "split incentive" problem: The landlord fronts the capital expenditure, but the tenant typically saves on the electricity bill. Unless the landlord can successfully raise the rent to capture that value, the direct financial return on investment is probably not worthwhile.
- High upfront capital outlay: Quality residential solar installations require a substantial initial cash injection, which could otherwise be used for property deposits, portfolio expansion, or essential maintenance.
- Maintenance and complications: While panels are generally durable, landlords take on the responsibility and cost of inverter replacements, cleaning, or potential roof repairs. If a tenant causes damage or if system faults arise, management overhead increases.
- Lease complications: Solar leases or Power Purchase Agreements (PPAs) can complicate things immensely for landlords. Trying to pass a third-party solar contract or lease payment onto a tenant—or trying to sell a BTL property with a tied-in solar lease—often turns off prospective buyers.
Are solar panels worth the outlay?
Solar panel installation costs in the UK vary depending on whether you opt for solar-only or bundle in a battery storage system. Prices benefit from a 0% VAT rate on domestic solar installations.
Two-bed homes (smaller terraces/flats)
Two-bedroom homes typically require smaller systems (around 3kW) because of restricted roof space or lower energy consumption.
| System |
Typical cost |
Number of panels |
How it works |
| Solar panels only |
£5,000 – £6,500 |
8 to 10 panels (~3kW) |
Generates daytime electricity; surplus feeds back to the grid. |
| Solar panels with battery storage |
£8,000 – £10,500 |
8 to 10 panels + 5kWh battery |
Stores excess daytime energy for evening use. |
Three-bed UK homes (standard semi-detached/terraced)
Three-bedroom houses are well-suited to a standard 4kW to 5kW system, which maximises typical roof layouts (roughly 10 to 12 panels).
| System type |
Typical cost |
Number of panels |
How it works |
| Solar panels only |
£6,000 – £8,000 |
10 to 13 panels (~4kW) |
The baseline setup for an average family household energy profile. |
| Solar panels with battery storage |
£9,000 – £12,500 |
10 to 13 panels + 5kWh to 10kWh battery |
Higher upfront outlay, but significantly reduces reliance on peak evening grid prices. |
Cost breakdown
- Scaffolding and labour: Usually bundled into total quotes, but complex roof layouts, tight access, or multi-storey structures can add £500 to £1,000+.
- Battery integration: Adding a solar battery generally adds £3,000 to £5,000 depending on the storage capacity (kWh) and inverter capabilities.
- Buy-to-let context: If you are installing these on a rental property, remember that standard residential quotes assume the occupant is consuming the power to save on bills. If your tenants aren't home during peak generation hours (e.g. working all day), a battery becomes much more important for storing energy—or you must ensure you capture the value via Smart Export Guarantee (SEG) tariffs or adjusted rent.
Generally, outright purchase is worth it only if certain conditions are met, but rarely makes financial sense if relied upon purely for short-term rental cash flow.
| Scenario |
Are they worth it? |
Why? |
| Bills Included (HMOs / serviced accommodation) |
Yes |
If you pay the electricity bill (common in HMOs or short-lets), cutting grid reliance drops your direct operating expenses immediately, yielding a fast, calculable payback period. |
| Long-term strategic investment (Single-family BTL) |
Maybe |
If you plan to hold the property for 10+ years, want to future-proof your EPC rating, and can negotiate minor rent increases, the long-term asset appreciation and incremental income can justify the cost. |
| Short-term flip or high-churn portfolio |
No |
The payback period for solar is often 7 to 12+ years. If you don't stay the course or can't translate lower bills into higher rent, you won't recoup the capital before selling. |
Key considerations before installing solar panels
- The rent-to-cost balance: Run the numbers. If a system costs £6,000 to £10,000 to install, calculate how many months of increased rent or saved utility bills it takes to break even.
- Tax treatment: Check how capital expenses for green upgrades are treated under local tax laws (for instance, whether they can be offset against property income or capital gains).
- Control: Always buy the system outright rather than entering a lease or PPA structure on a rental property to avoid complicating future property sales or tenant handovers.
- Borrowing to invest: Many lenders have terms and conditions about the installation of solar panels on roofs, so make the call to your lender before committing to an installer.
Finding more information
Landlords looking for objective information, regulatory updates, and guidance on installing solar panels can refer to several primary UK resources:
- The Energy Saving Trust (EST): Offers comprehensive, independent guidance on domestic solar panels, battery storage, and energy efficiency. They provide calculators to help estimate system performance and output.
- GOV.UK: The official government portal provides statutory guidance on Energy Performance Certificates (EPCs), building regulations, and permitted development rights for renewable energy installations. It is also the hub for checking eligibility for schemes such as the Warm Homes: Local Grant or the Energy Company Obligation (ECO4), which occasionally fund solar measures for qualifying low-income or off-gas properties.
- Microgeneration Certification Scheme (MCS): The standards organisation for renewable energy technology in the UK. Its database is the primary tool for finding certified, reputable local installers and approved products.
- TrustMark: A government-endorsed quality scheme that helps property owners find reliable, vetted tradespeople and retrofit coordinators for energy-efficiency upgrades.
