- 1The single most important question is “are the panels owned or leased?”. Owned panels are an asset that transfers cleanly with the property; leased panels (rent-a-roof or PPA) come with a long-term contract and possible mortgage friction.
- 2An active Feed-in Tariff can be worth £300-£1,500+ per year for the next 5-15 years and transfers to you on completion. Early systems (2010-2012) command the highest tariffs and add real value to the home.
- 3Request a full document pack: MCS certificate, Electrical Installation Certificate, DNO notification, panel and inverter warranties, FIT statement, and any lease/PPA agreement. Missing paperwork is the #1 cause of conveyancing delay on solar properties.
- 4Inspect the system: panel condition, inverter age, generation history. Inverters typically need replacing at 10-15 years (£800-£1,500), so factor that into your offer if the system is older.
Finding a house with solar panels already installed can be a significant bonus – free electricity generation from day one, lower bills, and no installation hassle. But solar panels on a property also require careful due diligence before you commit to buying.
The critical question is whether the panels are owned outright or subject to a lease, rental agreement, or Power Purchase Agreement. Owned panels are an asset that transfers with the property. Leased panels come with ongoing obligations that transfer to you as the new owner – sometimes with unwelcome surprises.
This guide explains everything you need to check when buying a house with solar panels, the documents to request, questions to ask, and how to ensure the solar system is a benefit rather than a burden.
Key Questions at a Glance
| Question | Why It Matters |
|---|---|
| Are the panels owned or leased? | Determines obligations and benefits |
| Is there a Feed-in Tariff? | Could be worth £300-£1,000+/year |
| How old is the system? | Affects remaining lifespan and efficiency |
| What documentation exists? | Warranties, certificates, registration |
| What condition are the panels in? | Visual inspection and performance check |
| Is everything properly registered? | DNO notification, MCS, FiT/SEG |
Owned vs Leased Panels
Why This Is the First Question
| Owned panels | Asset; you benefit from all generation; no obligations |
| Leased/rented panels | Lease transfers to you; ongoing payments; restrictions |
| PPA panels | Buy power from system; contract transfers |
| Impact on purchase | Leased panels can complicate or delay sale |
If the panels turn out to be leased, the situation is significantly more complex – see our dedicated guide to buying a house with leased solar panels for the mortgage and buyout detail.
Owned Panels
| Aspect | Details |
|---|---|
| Ownership | Panels belong to property owner |
| Transfer | Pass to you automatically with property |
| Benefits | All electricity savings are yours |
| FiT payments | Transfer to you (if applicable) |
| Maintenance | Your responsibility |
| Ideal situation | Best scenario for buyers |
Leased or Rented Panels
| Aspect | Details |
|---|---|
| Ownership | Third party owns the panels |
| Transfer | Lease agreement transfers to you |
| Obligations | Monthly payments; contract terms |
| Typical terms | 20-25 years; may have 10-15 years remaining |
| Electricity benefit | You use power free; may pay for export |
| Complications | Can affect mortgage; some lenders cautious |
Power Purchase Agreement (PPA)
| Aspect | Details |
|---|---|
| Ownership | Third party owns panels |
| How it works | You buy electricity from the system at agreed rate |
| Transfer | PPA contract transfers to you |
| Rate | Usually below retail rate; may escalate |
| Term | Typically 20-25 years |
| Key check | What is the current and future rate? |
Red Flags With Leased/PPA Systems
| Red Flag | Why It’s a Problem |
|---|---|
| High escalation rate | Payments may exceed retail electricity cost |
| Long remaining term | Locked in for many years |
| Difficult transfer process | May delay completion |
| Poor contract terms | Restrictions on roof access, removal costs |
| Unresponsive company | Problems if company hard to contact |
Feed-in Tariff (FiT)
Understanding FiT Value
| What it is | Government scheme paying for solar generation |
| Status | Closed to new applicants since April 2019 |
| Existing systems | Continue receiving payments for 20-25 years |
| Value | Can be worth £300-£1,500+ per year |
| Transfer | Payments transfer with property ownership |
FiT Payment Components
| Component | Description |
|---|---|
| Generation tariff | Paid per kWh generated (regardless of use) |
| Export tariff | Paid per kWh exported to grid |
| Index-linked | Payments increase with RPI inflation |
| Tax-free | No tax on domestic FiT payments |
FiT Rates by Installation Date
| Installation Period | Typical Generation Tariff |
|---|---|
| 2010-2012 | ~40-45p/kWh (now ~55-65p with RPI) |
| 2012-2015 | ~15-21p/kWh (now ~20-30p with RPI) |
| 2015-2019 | ~4-12p/kWh (now ~5-16p with RPI) |
FiT Transfer Process
| Step | Action |
|---|---|
| 1 | Confirm FiT is in place and payments current |
| 2 | Get FiT statement showing rate and remaining term |
| 3 | Seller notifies FiT licensee of property sale |
| 4 | Complete change of ownership form at completion |
| 5 | New owner registers with FiT licensee |
| 6 | Payments transfer to new owner |
For the regulator’s view of FIT transfer obligations and timelines, see Ofgem’s Feed-in Tariffs guidance for applicants – the same rules apply to inherited systems on house purchase.
Documentation to Request
Essential Documents
| Document | Why You Need It |
|---|---|
| MCS certificate | Proves compliant installation; required for FiT/SEG |
| Ownership proof | Confirms panels are owned, not leased |
| FiT statement | Shows tariff rate, term, payments |
| DNO notification | Confirms grid connection properly registered |
| Electrical certificate | BS 7671 compliance; Part P if applicable |
| Panel warranty | Coverage remaining; transferability |
| Inverter warranty | Coverage remaining; replacement history |
| Installation invoice | Shows date, specification, installer |
For more detail on what the Electrical Installation Certificate covers and why your buyer’s solicitor will ask for it, see our Part P building regulations guide.
For Leased/PPA Systems
| Document | Why You Need It |
|---|---|
| Lease/PPA agreement | Full terms and conditions |
| Payment schedule | Current and future payment amounts |
| Escalation clause | How payments increase over time |
| Transfer process | How lease transfers to new owner |
| End of term options | What happens when lease ends |
| Early termination | Can you buy out? At what cost? |
| Removal clause | Who pays if panels need removing? |
Nice to Have
| Document | Usefulness |
|---|---|
| Generation history | Shows actual performance over time |
| Monitoring access | Transfer of app/portal access |
| Maintenance records | Any work done; inverter replacements |
| User manuals | For panels, inverter, monitoring |
| Installer details | Contact for warranty claims |
What to Check
Visual Inspection
| Check | What to Look For |
|---|---|
| Panel condition | Cracks, discolouration, damage |
| Frame condition | Rust, corrosion, loose fittings |
| Mounting | Secure attachment; no movement |
| Cables | No exposed wiring; proper routing |
| Roof condition | Tiles intact around panels |
| Inverter | Location accessible; no warning lights |
| Shading | Any new shading since installation? |
If you spot any visible damage during a viewing, see our guide to what to do with broken solar panels for typical replacement costs to factor into your offer.
Performance Check
| Check | How to Verify |
|---|---|
| Current output | Ask to see inverter display on sunny day |
| Annual generation | Compare to expected for system size |
| FiT meter readings | Check recent readings vs historical |
| Error history | Any recurring faults on inverter? |
Expected Annual Generation
| System Size | Expected Annual Output (UK) |
|---|---|
| 2 kWp | ~1,700-2,000 kWh |
| 3 kWp | ~2,500-3,000 kWh |
| 4 kWp | ~3,400-4,000 kWh |
| 5 kWp | ~4,200-5,000 kWh |
System Age Considerations
| Age | Considerations |
|---|---|
| 0-5 years | Still under most warranties; peak efficiency |
| 5-10 years | May need inverter replacement soon |
| 10-15 years | Likely inverter replaced or due; panels still good |
| 15+ years | Check performance carefully; still years of life left |
Questions to Ask the Seller
Ownership and Financial
| Question | Why Ask |
|---|---|
| Do you own the panels outright? | Critical first question |
| Is there any finance outstanding? | Must be cleared before sale |
| Are you receiving FiT payments? | Significant financial benefit |
| What is the FiT rate? | Value varies hugely by installation date |
| How much do you earn annually? | Real-world financial benefit |
| What are your typical bills now? | Understand actual savings |
Installation and History
| Question | Why Ask |
|---|---|
| When was the system installed? | Age affects performance and warranties |
| Who installed it? | Quality and warranty support |
| Are they still in business? | Important for warranty claims |
| Has the inverter been replaced? | Common need after 10-15 years |
| Any problems or repairs? | History of issues |
| Do you have all documentation? | Essential for transfer |
If Leased/PPA
| Question | Why Ask |
|---|---|
| Who is the lease company? | Research their reputation |
| What is the monthly payment? | Ongoing cost to you |
| How many years remaining? | Length of commitment |
| What is the escalation rate? | How payments increase |
| Can the lease be bought out? | Option to own outright |
| What happens at end of term? | Your options when lease ends |
Legal Considerations
Conveyancing Checks
| Check | Details |
|---|---|
| Title search | Any charges registered against property for panels? |
| Lease registration | Is any lease properly registered? |
| Planning | Was planning permission required and obtained? |
| Building regs | Any required approvals in place? |
| Listed building | Was listed building consent obtained if needed? |
If a lease is registered against the title, your conveyancer will check it against UK Finance’s Mortgage Lenders’ Handbook clause 5.20, which sets the minimum standards lenders require for roof-space leases.
Solicitor Questions
| Ask Solicitor To | Why |
|---|---|
| Review any lease/PPA | Understand obligations you’re taking on |
| Check for charges | Encumbrances on property |
| Confirm FiT transfer | Ensure payments will transfer |
| Include in contract | Seller warranties about system |
| Verify documentation | All certificates and registrations |
Contract Inclusions
| Include in Contract | Purpose |
|---|---|
| Seller warrants ownership | Confirms no lease/finance |
| All documentation to be provided | Ensures handover |
| System in working order | Protection if faults emerge |
| FiT transfer cooperation | Seller must complete transfer |
| No outstanding payments | Clear of debts/charges |
Mortgage Considerations
Owned Panels
| Impact | Generally none – treated as property improvement |
| Valuation | May add modest value |
| Lender concerns | Usually none |
| Documentation | MCS certificate may be requested |
Leased/PPA Panels
| Impact | Some lenders cautious; may affect approval |
| Lender concerns | Third party has interest in property |
| Required info | Copy of lease agreement for lender review |
| Potential issues | Some lenders won’t lend on leased panels |
| Solutions | Choose lender experienced with solar leases |
Lender Positions
| Lender Type | Typical Position |
|---|---|
| Major high street | Most accept; may need documentation |
| Building societies | Generally flexible |
| Specialist lenders | Usually experienced with solar |
| Some smaller lenders | May be cautious about leases |
Insurance Considerations
Buildings Insurance
| Requirement | Must inform insurer of solar panels |
| Premium impact | Usually minimal or none |
| Rebuild cost | Include solar system value |
| Coverage | Check panels covered for damage, theft |
What to Tell Insurer
| Information | Why Needed |
|---|---|
| System installed | Material change to property |
| System value | Adequate rebuild coverage |
| Owned or leased | Affects whose responsibility |
| Installation date | For records |
Valuation and Pricing
Do Solar Panels Add Value?
| Owned panels | Generally yes – typically £2,000-£5,000+ |
| FiT payments | High FiT rates add significant value |
| Leased panels | Neutral to slight negative |
| EPC impact | Improves energy rating – attractive to buyers |
For a deeper look at how panels affect property value – and the conditions under which they help vs hurt – see our guide to solar panels and home value.
Valuing FiT Income
| Calculation Approach | Method |
|---|---|
| Simple method | Annual FiT income × years remaining |
| Discounted | Net present value of future payments |
| Rule of thumb | FiT systems worth 5-10× annual income premium |
Example Valuations
| Scenario | Potential Value Add |
|---|---|
| 4kW owned, no FiT | ~£2,000-£4,000 |
| 4kW with high FiT (10 years left) | ~£5,000-£10,000+ |
| 4kW with low FiT (5 years left) | ~£3,000-£5,000 |
| 4kW leased | ~£0 (or slight negative) |
After Purchase
Immediate Actions
| Action | Timeline |
|---|---|
| Register FiT transfer | Within 30 days |
| Transfer SEG registration | Promptly |
| Update insurance | Immediately |
| Set up monitoring access | First week |
| Read meters | At completion |
| File documentation | Keep safe |
FiT Transfer Steps
| Step | Action |
|---|---|
| 1 | Identify FiT licensee (energy supplier) |
| 2 | Complete change of ownership form |
| 3 | Provide proof of property purchase |
| 4 | Submit meter readings |
| 5 | Set up payment to your bank account |
| 6 | Confirm transfer complete |
SEG Registration
| If no FiT | Register for SEG to get export payments |
| Process | Apply to any SEG licensee |
| Requirements | MCS certificate; smart meter usually needed |
| Comparison | Compare SEG rates between suppliers |
If the system isn’t on FIT, register for the Smart Export Guarantee instead – use our SEG calculator to check the rate at different suppliers before signing up.
Pros and Cons
Advantages of Buying With Solar
| Advantage | Details |
|---|---|
| Immediate benefits | Lower bills from day one |
| No installation hassle | Already done; no disruption |
| FiT income | Potentially valuable payments transfer |
| Proven system | Track record of performance available |
| Better EPC | Higher energy efficiency rating |
| Depreciation done | Initial cost already absorbed |
Potential Disadvantages
| Disadvantage | Details |
|---|---|
| Leased complications | Inherited obligations; payment commitments |
| System age | Older system; less remaining life |
| Not your choice | Different specification than you’d choose |
| Unknown history | May have issues not immediately visible |
| Inverter timing | May need replacement soon |
| Documentation gaps | Seller may have lost paperwork |
Summary
| Aspect | Key Points |
|---|---|
| First question | Owned or leased? Changes everything |
| Owned panels | Asset; FiT transfers; generally positive |
| Leased panels | Obligations transfer; check terms carefully |
| FiT value | Can be worth £300-£1,500+ per year |
| Documentation | Essential – request everything |
| Due diligence | Visual check; performance; age; condition |
| Legal | Solicitor should review fully |
| After purchase | Transfer FiT/SEG; update insurance |
Buying a house with solar panels can be an excellent bonus – particularly if the system is owned outright and comes with valuable Feed-in Tariff payments. Early FIT installations from 2010-2012 can be worth over £1,000 per year in payments alone, plus electricity savings. That is real money that transfers to you as the new owner.
The key is due diligence. Confirm ownership status immediately – leased panels come with obligations that may not suit you. Request all documentation and have your solicitor review everything. Check the system’s age, condition, and performance history. Factor any remaining inverter life into your calculations.
With proper checks, a property with owned solar panels is genuinely more valuable and will deliver benefits from day one. With leased panels, you need to understand exactly what you are taking on and whether the terms are acceptable. Either way, going in with full knowledge ensures the solar system is a benefit, not a burden.
Pre-completion checklist. Before you exchange, get six things in writing: (1) confirmation panels are owned outright (or full lease document if leased); (2) MCS certificate and Electrical Installation Certificate; (3) FIT statement showing current tariff rate, RPI escalation, and remaining term; (4) DNO notification and any G98/G99 paperwork; (5) panel and inverter warranty documents with serial numbers; (6) at least 12 months of generation data from the inverter or monitoring portal.
If anything is missing, your solicitor can include warranties in the contract requiring the seller to obtain or replace it before completion. A 10-15 year-old system without paperwork isn’t a deal-breaker but it’s a negotiation lever – missing certificates can cost £500-£1,000 to regularise, and that should come off the asking price.
