FHBS 2027: Part L, L3 and HRB timelines in England

If you are learning the ropes in construction, training as an apprentice, or weighing up your first purchase, the rules for new homes in England have just been locked in. The Building Regulations etc. (Amendment) (England) Regulations 2026 were made on 23 March 2026, laid before Parliament on 24 March 2026, and most provisions start on 24 March 2027. This package implements the Future Homes and Buildings Standards (FHBS), as set out in the statutory text published by legislation.gov.uk.

Here is the simple version. Part L is retitled to focus on energy and emissions rather than just fuel and power. Requirement L1 is refreshed so designers and builders must both conserve energy and minimise greenhouse gas emissions. The term greenhouse gas takes its meaning from the Climate Change Act 2008, which brings the building rules in line with the UK’s wider climate duties.

A brand‑new requirement, L3, now sits alongside L1 and L2. When you erect a building that is or contains dwellings, you must provide a system for on‑site renewable electricity generation that residents can use. The system must be capable of a reasonable output given the building’s design and surroundings. There are targeted exemptions: certain ‘relevant buildings’ listed in regulation 7(4), sites where on‑site generation is not possible because of design or surroundings, or cases where an equivalent shared system already delivers renewable electricity to residents.

What this means for you as a learner or apprentice is practical. Expect solar PV on most new housing schemes, with shared arrays for blocks of flats. That means early thinking about roof layout, plant space, cable routes and safe access. If the team claims an exemption, they will need clear evidence and, where relevant, a shared system that genuinely serves occupants.

Fixed building services are widened. In new buildings, lifts, escalators and moving walkways now count as fixed services, except inside individual houses. Because they are counted, they must meet Part L’s expectations on energy efficiency, effective controls and commissioning. In real terms, vertical transport kit should not be an afterthought in the energy strategy.

A new handover rule matters for first‑time buyers. Where information must be given to the owner of a new dwelling under regulations 39 to 40B, it now has to be provided in an appropriate format. In plain English: you should receive usable energy and overheating information, not a jumble of inaccessible files. Expect clearer, more practical homeowner packs at completion.

Several cross‑references are updated so that pressure testing and commissioning line up with the revised L1 wording. The headline shift is the banner change to Part L itself: from conservation of fuel and power to energy and greenhouse gas emissions. That tells you what to teach and revise-fabric performance, efficient systems, and controls that actually get used.

Timelines are key for planning. Most of the instrument begins on 24 March 2027. For Higher‑Risk Building (HRB) work, and for work to existing HRBs, the amendments in regulations 3, 4, 6, 7, 8 and 9 begin later-on 24 September 2027. If your project crosses these dates, read the transitional clauses with care.

Transitional rules give non‑HRB projects a runway. If you gave a building notice, an initial notice or a full‑plans application before 24 March 2027, and you start that building before 24 March 2028, then the new amendments in regulations 3 and 4 do not apply to that work. Miss the 24 March 2028 start date, and you move onto the post‑FHBS rules.

For HRB schemes, the cut‑off is 24 September 2027. If a valid building control approval application for HRB work, for a stage of HRB work, or for work to an existing HRB was submitted to the Regulator before that date and was not rejected, the amendments made by regulation 3 do not apply to that work. Some cases can also continue under the 2021 transitional pathway where it already applies.

Older transition arrangements from 2013 and 2021 are largely revoked, but with savings. If an older saving applied to your job immediately before 24 March 2027, it can continue and the 2026 amendments in regulations 3 and 4 will not bite for that particular case-provided you start in time or the work is HRB‑related. Always check the exact dates on your notices and approvals.

Quick definitions help with class discussions. HRB refers to taller residential buildings-usually at least 18 metres or seven storeys with multiple homes-and, for the design‑and‑construction regime, certain tall hospitals and care homes. Microgeneration means small‑scale renewable electricity generation used on site, like a building’s own solar installation. Curtilage is the land directly around a building.

What this means for apprentices and site teams: coordinate PV arrays, inverters and metering with the electrical package from day one; plan for safe access and maintenance routes; and keep commissioning records tidy, because the new handover duty makes information quality visible to buyers and regulators. If you are revising, learn the L3 exceptions and the transitional dates by heart.

What this means for first‑time buyers: expect solar on your roof or a shared system for your block. Before exchange, ask your developer how you will access the renewable electricity, what the metering and billing will look like, and for the energy and overheating information required under regulations 39 to 40C. Clear packs make it easier to run your home and cut bills over time.

There is built‑in accountability. The government must review these regulations at least every five years from commencement and publish the findings. That means we should see public reports on whether the FHBS aims are being met and whether a simpler route could deliver the same results.

For transparency, this explainer is based on the statutory instrument and notes published by legislation.gov.uk, and on the Building Regulations it amends. If you teach construction, this is a good moment to refresh lesson plans on Part L and to practise reading transitional clauses carefully, using the exact dates: 24 March 2027, 24 March 2028 and 24 September 2027.