The Future Homes Standard (Part L 2026) is now confirmed. Here’s what developers need to know about solar PV, heat pumps and the 2027 deadline.
The wait is over.
On 24th March 2026, the government published the final Approved Documents for the Future Homes Standard – the long‑anticipated update to Part L of the Building Regulations for England. After two consultations and several delays stretching back to 2019, housebuilders, designers and the wider supply chain finally have confirmed requirements and a firm implementation date.
For developers, this is more than a technical footnote. Part L 2026 moves beyond simply reducing energy use and focuses on cutting greenhouse gas emissions. The headline target is clear:
All new homes must produce at least 75% less carbon emissions than homes built to 2013 standards.
That single figure will reshape how projects are specified, costed and delivered.
This article breaks down what has changed, when it takes effect, and what developers should be doing now.
What is the Future Homes Standard?
The Future Homes Standard (FHS) is the 2026 revision of:
- Part L (Conservation of Fuel and Power)
- Supported by updates to Part F (Ventilation)
Its purpose is to ensure every new home is “zero carbon ready” – meaning it can achieve net-zero operational carbon as the UK electricity grid decarbonises, without requiring costly retrofits.
The principle is straightforward:
- Homes using heat pumps and solar PV will automatically reduce emissions over time
- As grid electricity becomes greener, operational carbon trends toward zero
- No further upgrades are required to remain compliant long-term
The Three Changes That Matter Most for Developers
1. Fossil-fuel heating is effectively over
While not explicitly banned, gas and oil systems cannot realistically meet the new carbon targets.
This makes heat pumps the default solution for:
- Space heating
- Hot water
Impact on development design:
- Larger plant space requirements
- Increased electrical demand
- Acoustic considerations
- Earlier coordination with M&E consultants and suppliers
2. Solar PV becomes a core design driver
This is one of the most significant practical changes.
Requirement:
- PV equivalent to ~40% of ground floor area, where feasible
- Or a “reasonable amount” if constraints (e.g. shading/orientation) apply
What this means:
- Roofs must be designed for maximum usable area
- Orientation and pitch become critical at planning stage
- “Token” PV systems will no longer pass
In practice: PV is now a primary design constraint—not an add-on.
3. Tighter fabric and airtightness
Despite the shift toward renewables, fabric performance remains critical.
Key change:
- Airtightness improves to ~4 m³/h·m² @ 50 Pa (down from ~5)
Implications:
- Better insulation standards
- Higher construction quality
- More detailed junction design to limit thermal bridging
How Compliance Will Be Measured
There’s an important transition in modelling methodology.
- SAP 10.3 → Required at FHS launch
- Home Energy Model (HEM) → Introduced shortly after approval
- Dual-running period → Both accepted temporarily
Developer takeaway:
- Use SAP 10.3 now for current design work
- Begin preparing for HEM’s more detailed, data-driven approach
The Timeline You Need to Plan Around
The key dates are confirmed:
- 24 March 2026 — Approved Documents published
- 24 March 2027 — FHS comes into force (all new submissions must comply)
- 24 September 2027 — Applies to higher-risk buildings (e.g. tall residential)
- 24 March 2028 — Transitional cut-off
Critical transitional rule:
Projects only stay under current standards if:
- Building control submission is made before 24 March 2027, AND
- Construction of each building begins before 24 March 2028
Starting work on the site is not enough – it must be the building itself.
This distinction will catch many developers out.
What Developers Should Do Now
If your scheme is starting within the next 12–24 months, decisions made today will determine regulatory compliance.
Priority actions:
- Model schemes in SAP 10.3 early
- Treat PV sizing and roof design as planning-stage decisions
- Integrate heat pumps from concept stage
- Map each plot against transitional deadlines
Frequently Asked Questions
Does the Future Homes Standard apply to existing homes?
No. It applies only to new dwellings. Existing homes are not required to retrofit PV, and gas boiler replacements remain permitted.
Are gas boilers banned?
Not explicitly—but the carbon targets effectively make them non-viable for new homes.
Is solar PV mandatory?
Functionally, yes. Most homes will require PV systems equivalent to ~40% of ground floor area, with limited exceptions.
How Syntegra Can Help
Navigating Part L 2026 requires early, integrated energy and building services design.
Our Chartered Engineers can:
- Model your scheme in SAP 10.3
- Design compliant solar PV systems
- Deliver cost-effective heat pump solutions
Talk to our team about your next project →
Explore related services:
- Energy modelling (Energy Strategy & SAP/SBEM Calculations)
- Heat pump solutions (Mechanical Design Consultancy)
