Introduction: Why This Matters Now
The construction industry is at a pivotal moment. With the government confirming on 24 March 2026 that the Future Homes Standard will come into force on 24 March 2027, a fundamental shift in how new homes are built and equipped is now locked in. The Future Homes Standard represents one of the most significant updates to building regulations in recent years — and ventilation is at its core.
If you're an electrician, HVAC contractor, specifier, self-builder, or homeowner planning a new property, what you do today determines whether your installation meets tomorrow's standards. The regulations have now been finalised following extensive industry consultation and testing throughout 2025, and the updated Approved Documents have been published.
Unlike previous incremental updates to Approved Document F, the Future Homes Standard isn't simply adjusting ventilation rates by a few litres per second. It's reshaping the entire approach to how fresh air enters homes, how stale air is removed, and how building services teams should design and install ventilation systems. The target is clear: a 75–80% reduction in carbon emissions compared to homes built under 2013 standards.
This guide breaks down what's changing, why it matters, and how to prepare — whether you're specifying MVHR systems for a new-build or upgrading bathroom extract fans in an existing property.
What Is the Future Homes Standard?
The Future Homes Standard is a government-led framework designed to drive the decarbonisation of the housing sector. It follows the Future Buildings Standard (FBS) consultation and builds on the energy efficiency targets outlined in national climate commitments.
Timeline and Context
The Future Homes Standard has been introduced in phases:
- 2024–2025: Consultation and testing phase. The government released detailed technical guidance and made the Home Energy Model (HEM) available for industry testing in mid-2025, allowing specifiers, contractors, and developers to understand how their designs perform against the new carbon targets.
- March 2026: The government published the final regulations — The Building Regulations etc. (Amendment) (England) Regulations 2026 (SI 2026/335) — alongside updated Approved Documents F and L, confirming the full technical requirements.
- 24 March 2027: The standard comes into force. From this date, all new building work must comply with the Future Homes Standard requirements (England only — Scotland, Wales, and Northern Ireland have their own timelines).
- March 2028: End of the 12-month transition period. Projects with building control applications submitted before March 2027 may still be built to previous standards, but after March 2028 all new homes must comply regardless.
The 75–80% Carbon Reduction Target
At the heart of the Future Homes Standard is a simple but demanding goal: new homes must achieve a 75–80% reduction in carbon emissions compared to 2013 Building Regulations standards. This isn't achieved through ventilation alone, but ventilation plays a crucial role alongside:
- Improved fabric performance (insulation, air-tightness, windows)
- Low-carbon heating systems — the standard effectively ends the use of gas boilers in new homes, with heat pumps becoming the default
- Mandatory on-site renewable energy generation — solar PV equivalent to 40% of each dwelling's ground floor area is now required
- Efficient hot water storage and delivery
- Ventilation systems that minimise heat loss whilst maintaining indoor air quality
The interplay between these systems is critical. A poorly designed ventilation system can undo the benefits of a high-performance building envelope and an efficient heat pump. Conversely, the right ventilation strategy — particularly heat recovery ventilation — amplifies the carbon savings across the entire dwelling.
Key Changes to Part F Ventilation Requirements
Part F of the Building Regulations (Approved Document F Volumes 1 and 2) has been updated alongside the Future Homes Standard, with the revised version now published.
Increased Whole-Dwelling Ventilation Rates
Under the 2022 revisions to Part F, minimum ventilation rates for dwellings rose significantly. The current formula requires a base rate of 13 litres per second (l/s) for a one-bedroom dwelling, with an additional 6 l/s per additional bedroom. This means a two-bedroom property now requires a minimum of 19 l/s, and rates climb further for larger homes.
With the Future Homes Standard now confirmed, the trend is firmly toward:
- Mechanical systems: Ventilation rates approaching 30 l/s or more for larger dwellings, contextualised within the Home Energy Model methodology (which accounts for property size and occupant density).
- Demand-controlled ventilation: Systems that modulate rates based on occupancy, humidity, or CO2 levels rather than operating at fixed rates 24/7. Fan controls and sensors are increasingly central to compliant system design.
- Fabric-first approach: The regulations still emphasise that high-performance ventilation should be paired with improved building fabric, not used as a substitute for poor envelope performance.
Shift from Intermittent Extract Fans to Continuous MEV and MVHR
This is perhaps the most significant practical change. Historically, the standard approach in UK homes has been background ventilators in external walls or windows, combined with intermittent extract fans in kitchens and bathrooms — often manually controlled or humidity-triggered.
This approach is increasingly seen as inadequate. Intermittent extraction leaves stale air in living spaces between fan operation, and passive background ventilation allows uncontrolled infiltration and heat loss.
The Future Homes Standard favours a shift toward:
- Continuous mechanical extraction ventilation (MEV): Either decentralised (dMEV) units serving individual rooms — such as inline mixed flow fans — or centralised systems with dedicated ductwork.
- Mechanical ventilation with heat recovery (MVHR): The gold standard for high-performance buildings, capturing heat from extracted air and transferring it to incoming fresh air. Browse the full MVHR range.
This doesn't mean intermittent fans will disappear from the market, but specifiers and contractors should expect pressure to justify their use in new dwellings. Where they are used, they'll typically be supplemented with continuous background ventilation and demand-controlled boosters.
Reclassification of Ventilation Systems
The old System 1–4 classification in earlier iterations of Part F has been superseded. The current framework categorises systems as:
- Intermittent Extract with Background Ventilators: Manual or automatic extract fans combined with passive background ventilation through trickle ventilators or passive stack ventilation.
- Continuous Mechanical Extract Ventilation (MEV): This covers both decentralised MEV (dMEV) — individual mechanical extract units serving each wet room — and centralised MEV (cMEV) — a single central unit connected via ductwork to all wet rooms. Background ventilation is still required with both variants.
- MVHR (Mechanical Ventilation with Heat Recovery): A system combining extract from all rooms and supply to living spaces, with a heat exchanger recovering warmth from exhaust air. The most stringent requirements for ductwork and fittings, airtightness, and commissioning apply.
CO2 Monitoring Requirements
The Future Homes Standard sits alongside updates to building regulations for non-domestic buildings, which now require CO2 monitoring systems in certain building types with thresholds for automatic demand-controlled ventilation. This trend is beginning to influence residential standards as well.
For domestic properties, CO2 sensors are increasingly recommended as part of demand-controlled ventilation strategies, particularly in highly airtight, mechanically ventilated homes where indoor air quality can deteriorate if systems fail.
Trickle Ventilator Mandates on Replacement Windows
When existing windows are replaced, new windows must now incorporate trickle ventilators unless the building has a mechanical ventilation system serving all rooms. For new builds under the Future Homes Standard, this requirement is superseded if a continuous mechanical extraction or MVHR system is in place.
Non-Domestic Ventilation Rates
For commercial and industrial buildings, ventilation rates have been clarified as 10 litres per person per second or 1 litre per second per square metre of floor area — whichever is higher. Demand-controlled ventilation is increasingly specified in office, educational, and retail settings.
Ventilation System Comparison
The table below compares the main ventilation system types across key criteria relevant to the Future Homes Standard and Part F compliance:
| System | Details |
|---|---|
|
Intermittent Extract £1,500–£3,500 |
Manual or humidity-triggered extract fans in wet rooms with passive background ventilation via trickle ventilators. Part F compliant if whole-dwelling rates are met. Fair energy efficiency. Best for: small to medium dwellings, retrofit, cost-conscious projects. |
|
Decentralised MEV (dMEV) £3,000–£6,500 |
Individual continuous extract fans in each wet room with background ventilator supply. Good energy efficiency with humidity and occupancy modulation options available. Best for: medium dwellings, properties where central ducting is impractical. |
|
Centralised MEV (cMEV) £4,500–£8,000 |
Single central extract unit connected via ductwork to all wet rooms. More efficient than multiple dMEV units in larger properties. Good to very good energy performance. Best for: larger dwellings, new builds with planned ductwork routes. |
|
MVHR (Heat Recovery) £6,500–£15,000+ |
Central unit extracts from all rooms and supplies fresh air via ductwork with a heat exchanger recovering 70–90% of heat. Strongly supported by the Future Homes Standard. Excellent energy efficiency. Best for: new builds targeting high energy performance and 75–80% carbon reduction. |
Notes on Cost Ranges
These figures reflect current market conditions and include materials and typical installation labour. Costs vary significantly based on property size, ductwork routing complexity, system controls, whether the installation is new build or retrofit, and regional labour rates.
What This Means for Contractors and Specifiers
The shift toward the Future Homes Standard represents both a challenge and an opportunity for contractors and building services specifiers.
Challenge: Upskilling and Compliance Knowledge
Installing an MVHR system or a well-designed dMEV system is fundamentally different from fitting a couple of intermittent extract fans. The new requirements demand:
- Understanding of ductwork design: Pressure drop calculations, sizing, and routing to minimise noise and energy loss. Whether you're working with rigid ducting, flexible ducting, or flat channel systems, the design principles matter.
- Airtightness coordination: MVHR and cMEV systems only work efficiently in airtight buildings. Contractors must work closely with the construction team to ensure the building envelope is tested and certified.
- Commissioning protocols: Mechanical systems with heat recovery require careful balancing, filter installation, and commissioning to CIBSE TM23 standards.
- Controls and monitoring: Modern systems include humidity sensors, CO2 monitors, occupancy detectors, and smart controls. Browse fan controls and sensors for compatible options.
Opportunity: Market Demand and Premium Work
Projects targeting the Future Homes Standard will specify higher-specification ventilation systems. This creates opportunities for contractors to:
- Offer consultancy: Helping developers and specifiers choose the right system for their building's performance goals.
- Become approved installers: Brands like Systemair, Vent-Axia, and S&P offer installer certification programmes increasingly valued by housebuilders and specifiers.
- Bundle services: Offering design, installation, commissioning, and post-handover support as a complete package.
- Retrofit expertise: As existing housing stock becomes less competitive on energy performance, retrofit ventilation upgrades become a growth area.
Practical Recommendations for Specifiers
When specifying ventilation for a new dwelling under the Future Homes Standard:
- Start with fabric performance: Before selecting a ventilation system, ensure the building envelope meets airtightness and insulation targets.
- Use the Home Energy Model: The HEM has now replaced SAP as the methodology for assessing residential energy performance. Input your design to see how your ventilation choice affects overall carbon performance.
- Choose MVHR for ambitious carbon targets: If the project's energy performance target is high, MVHR is almost always the right choice.
- Plan ductwork routing early: Involve the building services team from design stage. Late ductwork additions are costly and compromise efficiency.
- Specify demand control: Where budgets allow, specify CO2 or humidity-controlled ventilation to reduce energy use whilst maintaining indoor air quality.
- Commissioning is non-negotiable: Budget for full commissioning, filter installation, and a handover session with the occupants.
What This Means for Homeowners and Self-Builders
If you're building a new home or substantially refurbishing an existing one, the Future Homes Standard affects you in two key ways: cost and long-term value.
Planning Considerations
- Ductwork routing: Factor in ductwork routes from the outset. MVHR and cMEV systems require ducting to multiple rooms — this must be planned with your architect or designer. Read our guide on ducting on construction projects for a full overview of types and sizing.
- Space for central units: MVHR and cMEV units require a plant room or cupboard, typically 1–2 square metres.
- Airtightness: A high-spec ventilation system only performs well in an airtight building. Ensure your designer and builder understand the performance targets.
- Solar PV integration: With mandatory solar panels now part of the standard, consider how your ventilation strategy fits within the broader energy system — MVHR paired with a heat pump and solar PV is the combination the standard is designed around.
Cost Expectations
- Small terraced house or apartment (65–85 m²): Intermittent fans £2,000–£3,000; dMEV £3,500–£5,000; MVHR £7,000–£9,000.
- 3–4 bedroom detached house (120–180 m²): Intermittent system £3,000–£4,000; dMEV £5,000–£7,500; MVHR £10,000–£14,000.
For new-build homes under the Future Homes Standard, housebuilders increasingly absorb ventilation cost as standard rather than an upgrade. For self-builders, it's a line-item cost that should be budgeted early.
Long-Term Benefits
- Heating cost reductions: An MVHR system recovering 80% of heat from extracted air can reduce heating demand by 10–20%. Over 20 years, this saving easily outweighs the installation cost.
- Indoor air quality: Continuous mechanical ventilation removes odours, moisture, and stale air far more effectively than intermittent fans or passive ventilation.
- Humidity control: Properly installed and commissioned systems maintain relative humidity in the 40–60% range, preventing damp and excessively dry conditions.
- Resale value: A home with an efficient ventilation system is increasingly desirable as building standards tighten.
- Future-proofing: A home built to the Future Homes Standard won't face retrofit pressure when standards inevitably tighten further.
Product Recommendations by Scenario
eFans stocks a comprehensive range of ventilation products across all categories. Here's how to think about your selection:
Small Renovation or Retrofit
Best choice: Intermittent extract fans or dMEV units with background ventilators. These can often be added without major structural work. Browse our bathroom extractor fans and kitchen extractor fans for suitable units.
New Build Aiming for Good Energy Performance
Best choice: Decentralised MEV or centralised MEV with demand controls. Our inline mixed flow fans range includes options with occupancy and humidity sensing — read more in our guide to what is a mixed flow extractor fan.
New Build Targeting Future Homes Standard Compliance
Best choice: MVHR. This is non-negotiable if you're aiming for the full 75–80% carbon reduction. Our MVHR units and heat recovery systems cover compact and distributed options suitable for various dwelling sizes.
Listed Building or Heritage Project
Best choice: Intermittent fans or dMEV with careful ductwork routing to minimise visual impact. Check our domestic fans range for discreet installations.
Retrofit of 1960s–1990s Property
Best choice: dMEV or MVHR (if airtightness can be improved). Our single room heat recovery range offers options sized for existing homes that don't require whole-house ductwork.
High-Density Residential (Apartments, Flats)
Best choice: MVHR or dMEV with shared extraction risers. Centralised systems are often infeasible in multi-unit buildings. Our domestic heat recovery and compact MVHR units serve this sector.
Compliance Checklist
Use this checklist when designing and installing ventilation for a new dwelling or major refurbishment:
- Confirm applicable standard: Is the project under current Part F, or the Future Homes Standard (post-March 2027)? Does the transition period apply (applications submitted before March 2027 may use previous standards until March 2028)? Is it in England, Scotland, Wales, or Northern Ireland?
- Determine whole-dwelling ventilation rate: Calculate the rate using the applicable formula — 13 l/s base plus 6 l/s per additional bedroom, or as required by the Home Energy Model for the specific dwelling.
- Select system type: Choose from intermittent extract, continuous MEV (dMEV or cMEV), or MVHR based on building performance targets and project constraints.
- Plan ductwork layout: Map out ducting routes, sizing, and material specifications. Ensure pressure drop calculations are within acceptable limits. Use appropriate ducting fittings and grilles and valves.
- Specify airtightness targets: If using MVHR or cMEV, specify building envelope airtightness (e.g., ≤3 m³/h·m² at 50 Pa).
- Confirm background ventilation: If using intermittent extract or dMEV, verify that background ventilators or trickle vents are specified for all rooms.
- Control system design: Specify operation mode — manual, time-controlled, humidity-controlled, CO2-controlled, or occupancy-controlled. See our fan controls and sensors.
- Electrical integration: Confirm correct wiring to Building Regulations standards, with isolation switches where required.
- Commissioning protocol: Specify commissioning to CIBSE TM23 or equivalent, including balancing, filter installation, and occupant training.
- Documentation and handover: Provide operation manuals, commissioning records, and filter change schedules. We supply replacement filters for most systems.
- Use Home Energy Model: Input your design into the HEM (which has now replaced SAP) to verify the ventilation strategy contributes to the required carbon reduction target.
- Regulatory sign-off: Ensure building control is satisfied with Part F compliance before practical completion.
Conclusion
The Future Homes Standard represents a fundamental shift in how new homes are ventilated. The move away from intermittent extract fans and toward continuous mechanical extraction or MVHR isn't just a regulatory change — it's an acknowledgement that modern, airtight, high-performance buildings require a different approach to fresh air management.
For contractors and specifiers, this shift demands investment in training and systems knowledge, but it also opens doors to higher-value work and premium positioning. For homeowners and self-builders, it means higher upfront costs but significant long-term savings, improved indoor air quality, and a future-proofed asset.
With the regulations now confirmed and the March 2027 implementation date set, the time to prepare is now. Whether you're specifying a dMEV retrofit, designing MVHR for a new-build, or simply trying to understand what your builder is proposing, the principles are consistent: match the ventilation system to the building's fabric performance, plan ductwork early, commission thoroughly, and treat indoor air quality and energy efficiency as equally important goals.
Need help choosing the right system? As a specialist UK supplier of ventilation and HVAC equipment, we understand the Future Homes Standard, Part F compliance, and the practical challenges of selecting and installing the right system. Whether you're a contractor seeking product advice, a specifier planning a project, or a self-builder researching options, our team can help.
Get in touch for expert advice on ventilation solutions tailored to the Future Homes Standard.