Solar panels on new builds are set to become the norm in the UK. The Future Homes Standard, which comes into force in 2027, will require virtually all new homes to be built to near-zero carbon specifications, with solar panels as the default way of meeting that standard on the vast majority of plots. If you’re buying a new build now, understanding what solar provision the developer is including, and what your options are if they’re not including enough, is increasingly important. And if you own an existing property near a new development, the same technology, costs, and grants apply to you.
This guide covers what the rules actually say, what solar systems look like on new build homes in 2026, what the costs and savings are, and what to ask your developer if you’re buying off-plan.
Contents
- 1 Key Takeaways
- 2 The Future Homes Standard and Solar Panels
- 3 What Solar Systems Do New Build Homes Currently Include?
- 4 New Build Solar Costs and Savings
- 5 MCS Certification on New Build Solar
- 6 Smart Export Guarantee on New Builds
- 7 Retrofitting Solar to an Existing Property Near New Builds
- 8 What to Ask a New Build Developer About Solar
- 9 Case Study: Manchester New Build Estate, South-Facing Aspect
- 10 Expert Insights From Our Solar Panel Installers About New Build Solar
- 11 Frequently Asked Questions
- 11.1 Are solar panels compulsory on new builds in the UK?
- 11.2 Do new build solar panels qualify for the Smart Export Guarantee?
- 11.3 Can I add battery storage to a new build solar system?
- 11.4 What size solar system do new builds typically have?
- 11.5 Does solar on a new build affect the house price?
- 11.6 What is the Future Homes Standard?
- 11.7 Can I negotiate better solar on a new build?
- 11.8 Do I need planning permission for solar on a new build?
- 12 Summing Up
Key Takeaways
- The Future Homes Standard (2027) will require new homes to produce 75–80% less carbon than current regulations, with solar panels the primary compliance route for most developers.
- Many developers are already including solar panels on new builds ahead of the 2027 deadline to meet current Part L building regulations.
- New build solar systems are typically 3–4kWp, generating 2,500–3,400kWh per year and saving around £550–£700 annually on energy bills.
- New build solar panels qualify for the Smart Export Guarantee (SEG), earning export income on surplus electricity sent to the grid.
- Developer-installed panels may not be MCS-certified if installed as part of the build rather than by a specialist installer. Check the documentation before buying.
- Adding battery storage to a new build solar system significantly increases self-consumption and annual savings.
The Future Homes Standard and Solar Panels
The Future Homes Standard is the UK government’s framework for new residential construction from 2027. Its core requirement is that new homes produce 75–80% less carbon from heating and hot water than homes built under current regulations. The standard effectively rules out gas boilers in new builds and requires low-carbon heating, high levels of insulation, and renewable energy generation.
Solar photovoltaic panels are the primary tool developers will use to meet the generation requirement. For most housing types, a rooftop solar array combined with a heat pump for heating gives developers the clearest route to compliance. The government confirmed in its 2024 Future Homes Standard consultation response that solar will be the default specification for new homes where the roof geometry allows.
Ahead of the 2027 full implementation, the 2021 Part L update to building regulations already significantly tightened carbon targets for new homes, pushing many developers to include solar panels in standard specifications. If you’re buying a new build in 2026, the solar panels may already be included, but the specification, size, and quality vary significantly between developers.
What Solar Systems Do New Build Homes Currently Include?
The typical new build solar system in 2026 runs between 3kWp and 4kWp, covering 6–10 panels on the south, south-east, or south-west facing roof slopes. Larger detached properties and some semi-detached homes may have 4–6kWp systems. Terraced houses on east-west streets often receive smaller arrays, or in some cases bifacial panels to capture light from both sides.
Battery storage is included in a growing minority of new build specifications, particularly in premium developments and those developed by builders focusing on energy credentials. Most standard-specification new builds deliver the solar array only, leaving the buyer to add battery storage at additional cost post-completion. Given that battery costs have fallen significantly, adding a 10kWh battery for £4,500–£7,000 post-purchase is a straightforward upgrade that significantly improves the system’s financial performance.
New Build Solar Costs and Savings
When solar panels are developer-installed, the cost is typically included in the house price without being separately quoted. As a standalone purchase, the equivalent system costs £5,500–£8,000 for a 3–4kWp installation by an MCS-certified installer. The developer inclusion means you effectively receive this system at no additional cost, but it’s worth recognising it as a financial asset when comparing developments.
| System Size | Annual Generation | Annual Bill Saving | SEG Income (est.) | Total Annual Benefit |
|---|---|---|---|---|
| 3 kWp | 2,500 kWh | £480 | £120 | £600 |
| 4 kWp | 3,400 kWh | £640 | £160 | £800 |
| 4 kWp + 10kWh battery | 3,400 kWh | £980 | £60 | £1,040 |
Figures based on 24p/kWh electricity, 12p/kWh SEG rate, south-facing roof, South England yield. The battery row assumes 80% self-consumption reducing exported surplus.
MCS Certification on New Build Solar
This is a critical question for new build buyers. The MCS (Microgeneration Certification Scheme) is the UK quality standard that certifies both solar installers and equipment. MCS certification is required to register for the Smart Export Guarantee (SEG) and to ensure the system meets the technical standards that protect warranty claims.
The problem is that solar panels installed as part of a building contract by the developer’s main contractor are not always MCS-certified. The panels may be structurally sound and connected correctly, but if the installer isn’t MCS-registered, you may be unable to register for SEG and may have limited warranty protection compared to a standalone MCS installation.
Before exchanging contracts on a new build with solar panels, ask the developer explicitly whether the installation is MCS-certified. Request the MCS certificate number and installer credentials. If the developer cannot provide these, it is worth negotiating for the solar installation to be carried out by a named MCS-certified specialist, or factoring in the absence of SEG eligibility when assessing the property’s value.
Smart Export Guarantee on New Builds
Assuming the installation is MCS-certified, new build solar panels qualify for the Smart Export Guarantee in exactly the same way as any other domestic solar installation. You’ll need a SMETS2 smart meter installed by your energy supplier to record export readings, then register with an SEG licensee of your choice.
The major energy suppliers are obligated to offer SEG tariffs. Octopus Energy’s Outgoing Octopus tariff currently pays 15p/kWh, making it the market leader. Most other suppliers pay 8–12p/kWh. On a 4kWp system exporting around 1,500kWh per year (without battery), SEG income runs to £120–£225 annually depending on the rate. With a battery increasing self-consumption to 80%, exports drop and SEG income reduces, but the bill savings increase enough to more than compensate.
Retrofitting Solar to an Existing Property Near New Builds
If you own an existing home and are looking at solar installation, the same technology available to new build developers is available to you as a retrofit. The key difference is that retrofit installations require scaffolding, roof penetration assessment, and in some cases structural surveys, which are all included in the installer’s quote. An MCS-certified installer will assess your specific roof, provide a generation estimate, and handle the planning and DNO notification process.
The financial case for retrofitting in 2026 is strong. At current electricity prices, a 4kWp system with a 10kWh battery typically delivers £1,000+ in annual benefits (bill savings plus SEG income), with payback of 8–12 years and a 25-year system life. The 0% VAT relief (in force until at least March 2027) reduces the upfront cost compared to what you’d pay at standard 20% VAT.
What to Ask a New Build Developer About Solar
If you’re buying off-plan or early in a development phase, you may have the opportunity to influence the solar specification. The following questions establish whether the solar provision is genuine or a box-ticking exercise: Is the installation MCS-certified? Who is the named installer? What is the system size in kWp? What are the panel brand and model? Is battery storage included or available as an upgrade? What is the orientation and pitch of the panels? Are there any shared-roof complications with adjacent properties?
On larger developments, some builders offer solar and battery upgrades as factory-fitted options. These can be good value compared to retrofitting post-completion, particularly if the builder is using MCS-certified installers and the upgrade is included in the stamp duty calculation (potentially saving a percentage point of stamp duty on the system value).
Case Study: Manchester New Build Estate, South-Facing Aspect
Background
A family purchased a 4-bedroom detached new build property on a development in South Manchester. The developer had included a 4kWp solar system as standard. The buyers confirmed the installation was MCS-certified and registered for SEG with Octopus at 15p/kWh on completion.
Project Overview
The system comprised 10 panels at 400W each on a south-facing 35-degree pitch. No battery was included. The family added a 9.5kWh GivEnergy battery six months after moving in for £5,200 including installation.
Implementation
First-year generation was 3,800kWh (slightly above the expected 3,400kWh for a south-facing system in central England, attributed to an unusually sunny summer). Without the battery, SEG income in the first six months was £89. After battery installation, monthly bill savings approximately doubled as more generation was consumed directly rather than exported.
Results
Combined annual benefit in the second full year (with battery): £1,080. Split approximately £880 in bill savings and £200 in SEG income. The battery is on track to pay back in 6–7 years from the additional savings it delivers compared to solar-only. The family estimate their total energy bills are around 55% lower than equivalent homes on the same street without solar.
Expert Insights From Our Solar Panel Installers About New Build Solar
“The biggest issue we see with new build solar is buyers assuming MCS certification is automatic. It isn’t. Some volume housebuilders use their main electrical contractor to connect the panels, which doesn’t trigger MCS registration. The buyer moves in, finds they can’t register for SEG, and then has to pay an MCS installer to inspect and re-certify the system, which costs several hundred pounds. Always ask for the MCS certificate number before you exchange,” says one of our senior solar panel installers with over 13 years of UK residential experience.
Frequently Asked Questions
Are solar panels compulsory on new builds in the UK?
Not yet, but from 2027 the Future Homes Standard will require new homes to meet near-zero carbon specifications that will effectively make solar panels the standard solution for most developers. In the meantime, the updated Part L building regulations (2021) have already pushed many developers to include solar as part of their standard specification to meet tighter carbon targets.
Do new build solar panels qualify for the Smart Export Guarantee?
Yes, provided the installation is MCS-certified. Always ask the developer to confirm MCS certification before exchanging contracts. Without MCS certification, you cannot register for SEG payments, which are worth £100–£250 per year on a typical new build system.
Can I add battery storage to a new build solar system?
Yes, and it’s often easiest and cheapest to do this at the point of purchase or shortly after moving in. Some developers offer battery storage as a factory-fitted upgrade option. If not included, an MCS-certified installer can add a compatible battery after completion. Costs typically run £4,500–£7,000 for a 10kWh lithium battery with installation.
What size solar system do new builds typically have?
Most new build detached and semi-detached houses include 3–4kWp systems (6–10 panels). Larger executive homes may have 5–6kWp. Terraced houses with east-west orientated roofs often receive smaller systems or bifacial panels. The exact specification depends on the developer and the plot’s roof geometry.
Does solar on a new build affect the house price?
Yes positively. Research consistently shows that solar panels add 1–4% to property values. On a £400,000 new build, a developer-installed 4kWp solar system may add £4,000–£16,000 to the resale value compared to an equivalent home without solar. The EPC rating improvement from solar (typically pushing a house from B to A rating) also supports faster sales and better mortgage terms.
What is the Future Homes Standard?
The Future Homes Standard is the UK government’s new building regulation framework taking effect in 2027. It requires new homes to produce 75–80% less carbon from heating and hot water than homes built under current regulations. Solar panels combined with heat pumps are the primary compliance route. The standard effectively rules out gas boilers in new construction.
Can I negotiate better solar on a new build?
Often yes, particularly if buying early in a development phase when the developer has more flexibility. You can negotiate for larger panel arrays, MCS certification by a named specialist installer, battery storage as an included upgrade, or a price reduction if the developer’s standard specification doesn’t include solar. Having a clear specification in writing is essential.
Do I need planning permission for solar on a new build?
For standard rooftop solar on a new build, permitted development rights apply in the same way as for any other property, provided the panels don’t protrude more than 200mm from the roof plane and other standard conditions are met. Developer-installed systems are typically designed to fall within permitted development. Listed building or conservation area restrictions don’t typically apply to new build developments.
Summing Up
Solar panels on new builds are transitioning from a premium optional extra to a standard feature of new UK housing, driven by tightening building regulations and the impending Future Homes Standard. If you’re buying a new build with solar included, confirm MCS certification before exchanging, register for SEG promptly on completion, and consider adding battery storage to maximise your annual savings. If you’re retrofitting an existing property, the same financial case applies. Contact us for a free quote from our MCS-certified installer network.
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