Solar Panel Installation Costs UK — Home Solar System Pricing, Savings and ROI Guide (2026)

Solar Panel Installation Costs by System Size

All prices below are fully installed — panels, inverter, mounting rails, AC/DC cabling, generation meter, commissioning, DNO notification and MCS certificate. Scaffolding is included where a pitched roof requires it. VAT on domestic solar installations is currently 0%, so these figures are what homeowners pay.

The wide price range within each system size reflects the biggest cost variables: panel brand (Tier 1 vs Tier 2), inverter type (string vs microinverters vs optimisers), roof difficulty, and scaffolding complexity. A straightforward south-facing single-storey roof with easy access will always come in at the lower end of the range.

What Drives the Cost of a Solar Installation

Panel brand: Tier 1 vs Tier 2

Panel manufacturers are independently rated into tiers based on bankability and manufacturing quality. Tier 1 panels — brands like SunPower, REC, Canadian Solar and JA Solar — are produced at scale in modern factories with rigorous quality control. They typically carry 25-year performance warranties and degrade at less than 0.5% per year.

Tier 2 panels are cheaper by £50–£100 per panel but carry higher long-term degradation risk. For a 10-panel system, the price difference is £500–£1,000 upfront. Over 25 years, a Tier 1 panel retaining 87% of its output versus a Tier 2 retaining 80% represents a meaningful difference in lifetime energy generation — worth factoring into customer conversations when they are comparing quotes at different price points.

Inverter type

The inverter converts DC power from the panels into AC power for the home. String inverters (one central unit) are the most cost-effective and reliable choice for unshaded roofs — brands like SolarEdge, Fronius and Growatt dominate the UK market. Microinverters (one per panel) add £300–£600 to a typical system cost but eliminate shading losses at the string level and simplify monitoring. Panel-level optimisers (SolarEdge, Tigo) offer a middle ground — string inverter efficiency with individual panel monitoring.

Roof type and scaffolding

Concrete or slate tiles on a simple pitched roof are the easiest and cheapest installation. Flat roofs require tilt frames, adding £500–£1,000 to system cost. Metal roofing (standing seam, corrugated) needs specialist clamps. Scaffold costs for a typical two-storey house run £500–£1,000 for a standard solar install; difficult access or a hip roof with multiple faces adds to this. Always price scaffolding accurately — it is frequently underquoted by less experienced installers.

Battery Storage: Cost and Options

Battery storage adds £3,000–£6,000 to a solar installation depending on capacity and brand. The business case is strongest for homes with higher evening electricity consumption, EV owners, and anyone on a time-of-use tariff like Octopus Go (where off-peak electricity is around 7p/kWh). Adding a battery does not necessarily reduce the amount exported to the grid — but it significantly increases the proportion of solar generation consumed by the household rather than exported at low SEG rates.

Battery vs no battery: the grid-tied tradeoff

A grid-tied system (no battery) is simpler, cheaper, and still earns SEG export payments for surplus generation. It is the right choice for customers on a tight budget or those who are away from home during the day. A battery-plus-solar system increases self-consumption from a typical 30–40% up to 60–80%, dramatically reducing what gets exported at low SEG rates — but the battery cost extends the payback period. The right recommendation depends on the individual household's consumption pattern, not a one-size-fits-all upsell.

Annual Savings and Payback Period

At the current standard electricity rate of around 28p/kWh, a well-sized solar system saves a household significant money — particularly for those at home during the day. The savings figures below assume 50% self-consumption for solar-only systems and 70–75% self-consumption for battery systems.

Savings include both electricity bill reduction (self-consumed solar) and SEG export income. Payback periods assume electricity prices remain broadly stable — if prices rise further, payback shortens. Solar panels carry 25-year performance warranties; most of a system's value is generated after the payback point.

Smart Export Guarantee: Rates, How to Apply, and What Customers Earn

The Smart Export Guarantee (SEG) replaced the Feed-in Tariff for new installations from January 2020. Any licensed energy supplier with 150,000 or more customers must offer at least one SEG tariff. The rate is set by each supplier independently — there is no fixed government floor, only a requirement that the rate must be above zero.

In 2026, export tariffs range from 5p/kWh on standard deals up to 15p/kWh with specialist suppliers. Octopus Energy's Outgoing Octopus is consistently among the highest-paying, typically 15p/kWh. Customers on time-of-use tariffs can sometimes earn even more by exporting during peak demand periods.

To apply for SEG, the customer contacts their energy supplier directly. They will need: the MCS certificate for the installation, the generation meter serial number, and proof of MCS installer accreditation. The entire process can be done online with most suppliers in under 30 minutes. Customers begin receiving export payments on their energy bill the following month. As the installer, make sure customers leave with all the documents they need — a checklist in your handover pack avoids delays.

At 10p/kWh and assuming 50% export rate (typical for grid-tied system with no battery), a 4kW system generating 3,400 kWh/year earns around £170/year in SEG income — on top of the electricity bill savings from self-consumed power.

MCS Accreditation: What It Is and Why It Matters

MCS (Microgeneration Certification Scheme) is the quality standard for small-scale renewable energy installations in the UK. For solar PV, MCS accreditation means:

• Your company has been audited and meets defined standards for design, installation and workmanship
• You can issue MCS certificates for completed installations — the document customers need to access SEG payments
• You appear on the MCS installer database, where homeowners actively search when shortlisting quotes
• Your installations are covered by the MCS Consumer Code, giving customers additional protection

Annual MCS membership costs £2,000–£5,000 for a small company depending on scheme body and audit complexity. It is a genuine barrier to entry and one of the strongest competitive differentiators available to an installer. Non-MCS competitors who undercut on price cannot offer customers SEG registration — a fact worth making explicit in every quote.

Planning Permission, Roof Types and EPC Impact

When planning permission is required

Solar panels on a domestic roof fall under permitted development in England, Scotland and Wales — no planning application needed in most cases. The exceptions are:

• Listed buildings: Listed building consent is required before any solar installation. The process is more involved and approval is not guaranteed — the local planning authority assesses visual impact on the listed structure.
• Conservation areas: Solar panels on a roof visible from a public road or open space may need prior approval. Rules vary between local authorities — always check before committing to a quote.
• Flats and shared buildings: A freeholder or management company may impose restrictions on solar installations. Confirm ownership and consent rights before the survey stage.

Roof suitability by type

EPC ratings and solar

Adding solar panels typically improves a property's EPC rating by 4–8 points, which can push a D-rated property to a C — the threshold that unlocks many green mortgage products and is increasingly relevant for rental properties under incoming EPC requirements. Homeowners who are already considering solar alongside a remortgage or property sale should be made aware of this benefit. It is a genuine added-value talking point that does not cost the installer anything to mention.

How to Structure a Solar Quote That Wins Jobs

Solar quotes have more technical detail than most trade jobs. Customers often compare three or four quotes side by side. A well-structured document signals professionalism and builds the confidence needed to get a signature. Include:

• System specification: Total kWp, panel brand and model, number of panels, efficiency rating, inverter make and model. Customers increasingly google panel specifications before signing.
• Shading analysis: Note the results of your shading assessment. If shading affects any part of the roof, explain what mitigation you have specified — optimisers, microinverters, or panel positioning. Leaving this unaddressed is a source of post-installation disputes.
• MCS-compliant generation estimate: Use a recognised tool (PVCalc, SAP, or similar) to produce a defensible annual generation figure based on postcode, pitch, orientation and shading. State your assumptions clearly — this protects you if the customer later disputes whether the system is performing to expectation.
• Conservative savings and payback figures: Show projected annual electricity bill saving, estimated SEG income, and simple payback period. Use the actual current electricity rate, not an optimistic future prediction. Document your assumptions on a separate page if needed.
• What is included and excluded: Be explicit about scaffolding, DNO application fees, building regulation notifications, and what the customer receives on completion — MCS certificate, warranty documents, inverter monitoring app setup, generation meter registration.

Red Flags in Solar Quotes

Helping customers understand what separates a reputable installer from a poor one builds trust and positions you as the honest choice. Homeowners are increasingly research-savvy — bring these issues up proactively rather than waiting for them to be raised:

• No MCS accreditation: Without MCS, the customer cannot register for SEG. Over 25 years at 10p/kWh, missing SEG income on a 4kW system could cost a customer £3,000–£5,000. Competitors significantly below market rate are often non-MCS or using unbranded panels with no warranty backing.
• Unverified savings claims: Any quote promising a 4–5 year payback on a £9,000 system, or projecting electricity price rises of 10% per year, is not grounded in reality. These claims generate initial excitement but lead to dissatisfied customers and negative reviews when actual savings do not materialise.
• Pressure selling tactics: Same-day-only pricing, countdown timers in emails, claims that government grants are about to end — these are hallmarks of high-pressure solar sales operations. They erode trust in the whole industry. Reputable installers let customers take time to compare quotes.
• No site survey: A quote produced from just a postcode and satellite imagery — without a physical inspection of the roof, consumer unit, and cable routes — cannot be accurate. It is a warning sign that the installer is not taking the job seriously or is subcontracting to a third party without oversight.
• Missing DNO notification: Skipping G98/G99 notification is non-compliant and can cause problems with household insurance and future property sales. Any competent installer includes DNO notification in the job — confirm this is covered in your quote.

How Trade2Base Helps MCS Solar Installers Track What Marketing Works

Solar companies typically run multiple marketing channels simultaneously — Google Ads, Checkatrade, word-of-mouth referrals, social media, leaflet drops. The problem is not getting enquiries; it is knowing which enquiries turn into signed contracts at a margin worth having.

A lead from a Google search for "solar panel installer near me" behaves very differently from a referral from a satisfied customer. Google leads often shop on price; referral leads convert more readily and negotiate less aggressively. Without tracking, solar businesses tend to invest more in the channels that generate the most enquiry volume — which is not always the same as the most profitable work.

Trade2Base tracks where every enquiry comes from and links it through to whether it converted into a survey, a signed contract, and the job value. Over time, you get a clear picture of which channels bring in your best solar customers — not just the most enquiries, but the ones who book surveys, sign contracts, and refer their neighbours. For a solar company spending £1,000–£3,000/month on Google Ads, that visibility is the difference between a tight-margin operation and a business that knows exactly where to invest its next pound of marketing spend.