Future Homes Standard: What Developers, Builders and Homeowners Need to Understand Before 2027

The Future Homes Standard is the most significant change to Building Regulations for new residential construction in England since the early 2000s. It is not an aspirational target or a voluntary framework — it is a mandatory shift in how new homes must be designed, specified, and built. For developers, contractors, and homeowners planning projects that will complete after 2027, understanding what is changing — and acting on it now — is not optional.

What Is the Future Homes Standard?

The Future Homes Standard (FHS) is the UK Government's policy for all new homes in England to be built with low-carbon heating and very high levels of energy efficiency. It replaces the current Part L (Conservation of Fuel and Power) requirements with a more demanding performance regime, and introduces or strengthens requirements in Part F (Ventilation) and Part O (Overheating).

The standard removes the option to install gas boilers in new homes. Instead, developers must specify low-carbon heating systems — most commonly air-source heat pumps — and demonstrate that the building fabric, insulation, and ventilation are capable of supporting these systems efficiently. Critically, compliance is assessed on whole-home energy performance, not just individual component specifications.

Why This Matters in Real Construction Terms

The gap between what the Future Homes Standard demands and how most new homes have been designed and built over the last decade is substantial. The 2021 interim uplift to Part L moved things in the right direction, but the FHS goes significantly further. Many of the changes it requires are not simply a matter of swapping one product for another — they demand a different approach to design from the earliest stages of a project.

Heat pumps, for example, operate most effectively at lower flow temperatures than gas boilers. This means the entire heat distribution system — typically underfloor heating or larger-format radiators — needs to be designed around the heating system from the outset, not retrofitted to it. Ventilation is another area where the FHS creates real change. With homes built to higher airtightness, mechanical ventilation with heat recovery (MVHR) becomes the standard solution for maintaining healthy indoor air quality. These systems require careful commissioning and ongoing maintenance — something that needs to be communicated clearly to homeowners at handover.

Building Fabric: Where Performance Is Won or Lost

A fabric-first approach does not mean ignoring technology. It means ensuring that the building envelope — walls, floor, roof, windows, and the junctions between them — performs well enough that the heating and ventilation systems are doing less work. Under the Future Homes Standard, achieving the target fabric energy efficiency rate (TFEE) is non-negotiable, and the permitted flexibility in specification is significantly reduced compared to earlier versions of Part L.

The key fabric elements that require close attention are:

• U-values — walls, floors, and roofs must meet demanding maximum U-value targets; the FHS specification is considerably tighter than current Part L standards.
• Airtightness — the target air permeability is lower than most conventional housing sites have been achieving, which requires specific design detailing and consistent on-site workmanship across all trades.
• Thermal bridges — junctions between elements, around windows, and at penetrations through the envelope must be designed and built to minimise linear heat loss.
• Glazing and overheating — window specifications must balance daylight and solar gain; Part O compliance requires either simplified calculations or dynamic thermal modelling, depending on orientation and glazing area.

None of this can be achieved through specification alone. Quality should therefore be inspected, verified and documented during the build — not assumed at handover. Insulation continuity, air barrier details, window installation, and thermal bridging mitigation all need to be checked and recorded at each relevant stage, before areas are closed up.

What Developers Should Start Doing Now

Irrespective of whether a project will complete before or after the 2027 implementation date, developers should begin adapting their processes now. Supply chains for heat pumps and MVHR systems are under significant pressure, skilled trades familiar with these technologies are in short supply, and the learning curve involved in designing and delivering FHS-compliant homes takes time to work through. Developers who start early will encounter fewer problems on live projects.

Performance Modelling and Compliance Evidence

Modern construction is increasingly evidence-led. Building Regulations, safety obligations, insurance scrutiny and client expectations all place more pressure on project teams to show how decisions were made and how work was verified. The Future Homes Standard intensifies this across every element of the dwelling's performance.

Compliance is not assessed by specification alone. The Standard Assessment Procedure (SAP) calculation, updated to SAP 10.2 or its successor, must demonstrate that the dwelling meets both the target emission rate (TER) and the target fabric energy efficiency (TFEE). These calculations must be produced at design stage and confirmed as built at completion. The project also needs evidence that what was designed has been properly built — a clear audit trail showing that substitutions were assessed, stage inspections were carried out, and test results matched the modelled assumptions.

For developers and contractors, this is where good project governance becomes valuable. A structured approach to recording design decisions, product certifications, test results, commissioning records, and inspection sign-offs — maintained consistently across all plots on a scheme — gives building control bodies the confidence they need and protects the developer in the event of any post-completion dispute.

The Challenge for Smaller Developers

Large housebuilders have the in-house technical resources to adapt relatively quickly to the Future Homes Standard. For smaller developers, small-to-medium contractors, and self-builders, the challenge is more acute. The cost of low-carbon heating systems and MVHR is currently higher than equivalent gas-based alternatives, though the gap is narrowing and running costs are lower over the lifetime of the building.

The more significant challenge for smaller developers is the skills and knowledge required to procure, specify, and manage these systems correctly. Getting specifications wrong — a heat pump undersized for the dwelling, MVHR not balanced correctly, airtightness details not coordinated between trades — can result in a home that performs well below its modelled performance. Early engagement with specialists across energy assessment, heating design, and site quality management can help identify compliance gaps before they become programme or financial problems.

In practice, smaller teams may benefit from early consultancy support, design reviews, risk workshops or independent quality inspections. This gives access to the technical expertise that larger organisations develop in-house over many projects — without the overhead of a full-time specialist team.

How Tarj Construction Approaches the Future Homes Standard

At Tarj Construction, we work with clients and their design teams from the earliest stages of a project to ensure that energy performance targets are integrated into the design — not bolted on once detailed design is complete. We understand that meeting the FHS is not simply a matter of specifying a heat pump and airtightness membrane — it requires coordination across all trades, a construction quality standard that supports the performance model, and a documentation process that gives building control and homeowners confidence in the as-built performance of the dwelling.

Whether you are a developer planning your first FHS-compliant scheme or a homeowner commissioning a new home that will complete after 2027, getting the right team around the project early is the single most effective thing you can do to manage cost, programme, and compliance risk.

Key Takeaways

• The Future Homes Standard is now a live planning concern for new housing projects in England — schemes completing after March 2027 must comply.
• Gas boilers are not permitted in new homes under the FHS — low-carbon heating (typically air-source heat pumps) must be specified and designed in from the outset.
• Building fabric performance — U-values, airtightness, and thermal bridging — must meet tighter targets than current Part L, and must be verified on site, not just specified on paper.
• Compliance is evidenced through a documented audit trail — SAP calculations, commissioning records, test results, and inspection sign-offs — not just a completed EPC at handover.
• Smaller developers and self-builders should seek specialist support early — the technical coordination required across heating, fabric, ventilation, and documentation is greater than under current standards.

"Getting to grips with the Future Homes Standard is not about compliance for compliance's sake — it is about building homes that perform well, cost less to run, and stand up to scrutiny throughout their lifetime."Tarj Construction Team