Sub-sector 03a — Solar Reroof

A roof that
pays for itself

Full roof solar installation — generation, weather protection and long-term financial return from a single project. For properties due for reroofing, the combined cost is lower than a conventional reroof followed by solar later.

£ return 0 Now 5yr 10yr 15yr 20yr 25yr No return — cost only Reroof cost ~8–14yr payback Combined project cost £50–80k 25yr return Conventional reroof Solar reroof — 25yr return INDICATIVE 25-YEAR FINANCIAL COMPARISON

Necessary expenditure
vs investment with return

Conventional reroof

Necessary expenditure

Replaces aging roof. No return.

A conventional reroof is a maintenance obligation. The cost is significant — typically £8,000 to £20,000 depending on property size and material — and once spent it generates no financial return. The roof protects the building. That is all it does.

Cost spent once — no ongoing return
No impact on energy bills
No generation income
Solar added later means a second project and second cost
New roof disturbed for a retrofit solar installation
Solar reroof

Investment with return

Roof becomes generation surface. Long-term return.

A solar reroof replaces conventional tiles or slates with in-roof solar modules. The roof is weathertight, insured and fully compliant — and it generates electricity from the day it is commissioned. The combined cost is lower than two separate projects.

£1,800–3,500 annual saving from year one
Combined cost lower than reroof plus retrofit
No second project — no second disruption
25-year performance warranty on modules
Payback modelled at 8–14 years

Four scenarios where
it is the right decision

04
Properties due for reroofing
01

Properties due for reroofing

If a property needs reroofing within the next five years — aging slates, failing felt, leaking valleys — a solar reroof is worth assessing now. The alternative is spending on a conventional reroof and spending again on solar later. Combining them is almost always more cost-effective.

Conservation areas and listed building settings
02

Conservation areas and listed building settings

In-roof solar tiles sit flush with the roofline and are available in slate-effect and tile-effect finishes. They are widely accepted in conservation areas where conventional solar panels would not receive planning permission. We advise on planning requirements as part of the initial assessment.

Appearance-priority projects
03

Appearance-priority projects

Properties where standard roof-mount solar is visually unacceptable — period properties, architect-designed homes, or owners who prefer a flush finish. In-roof solar achieves identical generation without visible mounting hardware or panel framing above the roofline.

Properties with full roof area available
04

Properties with full roof area available

Detached and semi-detached properties with unobstructed roof area across multiple pitches achieve the highest system yields. A four-pitch Victorian property with 10–16 kWp across all elevations generates significantly more than a restricted south-facing roof-mount system.

Indicative system & return

4-bed property
typical configuration

Figures based on a four-bedroom detached property with good roof orientation across multiple pitches. System sized against 12 months of actual consumption data. Annual saving accounts for current export tariff, avoided import and battery optimisation. A roof assessment produces your property-specific numbers.

4-bed detached — indicative figures
10–16 kWp Solar system size
16–32 kWh Battery storage
£1.8–3.5k Annual saving
8–14 yr Payback period
Free — no obligation

Everything decided
before you commit

1
Roof condition survey
Structural assessment, tile or slate condition, felt, battens and valley condition.
2
Orientation & shading
All pitches modelled for yield. Shading from trees, chimneys and neighbouring buildings assessed.
3
System specification
Module type, inverter sizing, battery specification and EV integration options.
4
Financial model
Annual saving, payback period and 25-year projection with tariff sensitivity analysis.
5
Planning assessment
Conservation area advice, permitted development confirmation or planning support where required.
Book a free roof assessment →

Frequently asked
about solar reroofing

Is a solar reroof cheaper than a normal reroof plus solar panels?

On properties that require reroofing, a combined solar reroof is typically more cost-effective than a conventional reroof followed by a solar installation later. The combined cost is lower than two separate projects, and the solar element delivers a long-term financial return that a conventional reroof does not provide.

How much does a solar reroof cost?

Solar reroof costs depend on roof size, system specification and property type. For a typical 4-bedroom property, a combined solar reroof and battery storage system delivers annual savings of £1,800 to £3,500 with a payback period of 8 to 14 years. A free roof assessment gives you property-specific figures before you commit to anything.

Can I get a solar reroof in a conservation area or on a listed building?

In-roof solar tiles sit flush with the roofline and are available in slate-effect and tile-effect finishes. They are widely accepted in conservation areas where standard solar panels would not receive planning permission. Listed building consent requirements vary by property — we advise on planning requirements as part of the free roof assessment at no charge.

How long does a solar roof last?

In-roof solar systems are designed to the same service life as a conventional roof — typically 25 to 40 years. Modules carry a 25-year performance warranty. The installation is weathertight to BS 5534 and MCS certified, with the same guarantee structure as a conventional roofing installation.

Book a free
roof assessment

The assessment covers roof condition, orientation and shading analysis, system specification and a detailed financial model — before you commit to anything. If a solar reroof makes sense for your property, you will know exactly what it returns.