Heating · 5 min read · 28 Apr 2026

Why "hydrogen-ready" boilers were excluded from FHS

The October 2025 consultation response confirmed hydrogen-ready boilers receive no carbon credit under Part L 2026. We explain the maths and the political context.

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For three years the boiler industry lobbied for "hydrogen-ready" gas boilers to receive partial carbon credit under the Future Homes Standard. The October 2025 consultation response rejected the proposal. The March 2026 Approved Documents confirmed it. Here is why.

The carbon emissions maths

Part L 2026 demands a 75% CO₂ reduction versus the 2013 baseline. Natural gas at 0.21 kgCO₂/kWh delivers ~30%. Hybrid heat pump + gas at typical UK operation delivers ~50%. Heat pumps on the 2025-29 forward-looking grid (0.10 kgCO₂/kWh average) deliver ~78%. Heat pump connection to a heat network can hit 80%+. Hydrogen-ready boilers — which only run on natural gas until/unless hydrogen supply arrives — score identically to standard gas. There is no carbon credit to give.

The political context

Boiler manufacturers and the gas-industry lobby (BEIS, NIA, Energy UK) argued that excluding hydrogen-ready boilers risked "stranding" investment in dual-fuel infrastructure. The Government's response was that domestic hydrogen has no national rollout plan, the gas distribution network is not converting any time soon, and "future-proofing" buyers against a non-existent fuel switch is not a policy goal. The October 2025 response was unusually direct.

What it means for new builds

In new dwellings from 24 March 2027, only air source heat pumps, ground source heat pumps and connection to heat networks meet the Part L 2026 carbon targets. Gas boilers — including hydrogen-ready ones — are out. Existing homes are unaffected; gas boiler replacements in existing properties remain legal and will remain legal for the foreseeable future.

The 2027 supply-chain question

UK heat pump installation capacity will need to roughly triple by 2027 — from ~70,000/year in 2025 to ~250,000/year. MCS-certified installers, parts supply (refrigerants, controls) and hot water cylinder manufacturing all face capacity constraints. Bulk procurement frameworks like ours hedge against the price spikes that capacity-constrained markets produce.

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40% of ground floor area

PV / ground floor area

Mar 2027

FHS in force

75%

CO₂ vs 2013 baseline

£4,350 per dwelling

Per-plot premium

For developers and housebuilders

Why "hydrogen-ready" boilers were excluded from fhs for volume new-build programmes

Per-plot pricing locked at procurement. Factory pre-fit on panelised roof cassettes. SAP/HEM modelling for every house type included. NHBC, LABC, Premier and Buildmark warranty-accepted workmanship. 20-year insurance-backed system warranty. We work with developers from 50 plots to 5,000+ across multi-site frameworks — agreed pricing, agreed programme, agreed warranty stack.

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For self-builders and architects

Why "hydrogen-ready" boilers were excluded from fhs for one-off custom builds

Engagement from RIBA Stage 2. PV sizing collaborative with the architect. SAP/HEM modelling that gives the architect freedom on glazing ratios and roof geometry. Building Control submission pack ready for the Approved Inspector. 0% VAT on new-build dwellings. Staged invoicing aligned to your self-build mortgage drawdowns. We work with custom-build buyers across England, Wales and Scotland.

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How this fits into the FHS compliance pathway

Every FHS-compliant new build must pass three regulatory gates. Why "hydrogen-ready" boilers were excluded from fhs fits primarily into the second gate — design-stage Part L compliance — but has knock-on implications for Building Control sign-off and post-completion warranty:

1
Planning permission Most solar PV on new dwellings is consented within the dwelling\'s primary planning consent. Conservation Areas, Article 4 directions and listed-curtilage plots require additional planning consideration — we handle the planning evidence required for these.
2
Building Control — Part L compliance SAP 10.3 or HEM compliance modelling demonstrating Dwelling Emission Rate ≤ Target Emission Rate. PV specification, ASHP capacity, fabric U-values and air permeability all entered into the modelling. We provide the full compliance file ready for the Approved Inspector.
3
Post-completion — warranty & EPC MCS certificate, EPC, monitoring app onboarding and 20-year insurance-backed workmanship warranty. NHBC, LABC, Premier and Buildmark all accept our installation specification without query — important if you\'re relying on a structural warranty for buyer mortgageability.

For a fuller walkthrough of the compliance process, see our Part L 2026 page and the FHS PV calculator which sizes a compliant system from your ground floor area in 30 seconds.

Frequently asked

Common questions

Answers to the questions we get most often when discussing why "hydrogen-ready" boilers were excluded from fhs with new clients.

When does the Future Homes Standard come into force?

24 March 2027 in England, with a 12-month transitional period running to 24 March 2028 for projects already under construction. The Approved Documents L and F were published on 24 March 2026 (Government statement HCWS1445), giving the industry exactly 12 months of certainty before regulatory commencement. Scotland, Wales and Northern Ireland are following with broadly equivalent regulations on roughly aligned timetables, although devolved nuances apply — Welsh regulations are typically 6 months ahead.

What does FHS-compliant solar PV actually cost per plot?

The Government Impact Assessment puts the total FHS premium at ~£4,350 per dwelling per dwelling (2025 prices, weighted average across heat pump, solar PV, MVHR and enhanced fabric). Of that, solar PV is roughly £4,200 — covering ~3.4 kWp for a typical 3-bed semi (panels, in-roof mounting, inverter, monitoring, MCS certification and 20-year insurance-backed warranty). Larger dwellings cost proportionately more; volume procurement reduces per-plot cost by 20–25%.

Will the 40% PV rule actually be enforced?

Yes — the rule is a functional requirement in the Approved Document, not guidance. Building Control sign-off requires SAP/HEM modelling demonstrating compliance. The previous Part L 2021 token "2-panel" systems no longer pass, since they fall ~85% below the 40% benchmark. The deemed-to-satisfy route requires the full 40%; alternative compliance through enhanced fabric is possible but rarely cost-effective.

Can I exceed FHS minimum specifications?

Yes — and many self-builders and premium developers do. Marginal capital cost of a larger array (e.g. 5 kWp instead of 3.4 kWp on a 3-bed) is only £1,000–£1,200, while the additional generation pays back in 3–4 years at 2026 electricity tariffs. Upgrades that fit easily on top of an FHS-compliant base include battery storage (£3,500–£5,000), larger array size, EV charge point pre-fit (£600) and air permeability below 2 (achievable with deliberate detail).

FHS 2027 deadline approaching

Get an FHS-compliant solar quote in 48 hours

Tell us your plot details — ground floor area, location and target start-on-site date. We return a fully-costed system sized to Part L 2026 (40% PV rule), with the SAP/HEM compliance pack included.

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