London
Building Compliance in Hounslow
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Hounslow homes: a growing private rented sector
ONS Census 2021 findings for Hounslow show private renting rising from 23.4% of households in 2011 to 30.9% in 2021. Home ownership fell from 50.1% to 45.7%, while social renting fell from 22.8% to 21.0%. These are borough-wide tenure figures, not evidence of the condition or licensing status of an individual property.
For an acquisition or refurbishment in this substantial rented sector, start with the building rather than assuming all lettings need the same reports. Record the existing layout, heating, insulation and proposed occupancy. A retrofit assessment can help organise improvements, while an EPC addresses energy performance. The ONS tenure picture provides context for that work, but does not establish a particular home’s legal duties.
Services in Hounslow
New homes and conversions
- Air tightness testing in Hounslow
On-site testing that measures how much air leaks through a building's envelope, with a certificate for Building Control.
- Sound insulation testing in Hounslow
Pre-completion testing of separating walls and floors between homes, reported in the form Building Control expects.
- Ventilation testing in Hounslow
Airflow measurement of extract fans and ventilation systems, recorded for the Building Control completion file.
- MVHR commissioning in Hounslow
Setting up and measuring a mechanical ventilation with heat recovery system, with commissioning records for handover.
- SAP calculations in Hounslow
The energy calculation for new homes and conversions, from design stage figures to the as-built result.
- Home energy model in Hounslow
Assessment under the Home Energy Model, the government's planned replacement for SAP.
- U-value calculations in Hounslow
Calculated U-values for walls, floors and roofs, set out in a document Building Control can check against the limits.
- Thermal bridging calculations in Hounslow
Calculated psi-values for junctions, replacing default values in SAP and SBEM with measured detail.
- Condensation risk analysis in Hounslow
Analysis of how moisture moves through a wall, roof or floor build-up, showing whether condensation risk is acceptable.
- Water calculations in Hounslow
The water efficiency calculation for new homes, showing estimated daily use per person against the target.
- Background ventilation calculations in Hounslow
Calculations that size trickle vents and background ventilation for each room, ready for Building Control.
- Overheating assessments in Hounslow
Overheating assessment for new homes, using the simplified method where it applies.
- CIBSE TM59 and TM52 assessments in Hounslow
Dynamic thermal modelling of overheating risk, assessed against CIBSE TM59 for homes and TM52 for other buildings.
- Party wall and ceiling design in Hounslow
Design review of separating wall constructions between homes, so they are built to pass sound testing.
- Party floor design in Hounslow
Design review of separating floor constructions between flats, so they are built to pass sound testing.
- Regulation 25A reports in Hounslow
The report on high-efficiency alternative energy systems required for new buildings under Regulation 25A.
Commercial and public buildings
- SBEM calculations in Hounslow
The energy calculation for new and altered non-domestic buildings, with the BRUKL output Building Control asks for.
- Display energy certificates in Hounslow
Display Energy Certificates showing the actual energy use of public buildings, with the advisory report.
- Smoke shaft and AOV testing in Hounslow
Testing of smoke shafts and automatic opening vents to confirm they operate as designed.
- Fire risk assessments in Hounslow
A written assessment of fire risk in a building's common or work areas, with the actions needed to reduce it.
- Legionella risk assessments in Hounslow
An assessment of a building's water systems that identifies legionella risk and the controls needed.
- Commercial and industrial noise surveys in Hounslow
Assessment of sound from commercial and industrial sources under BS 4142.
- Entertainment and night club noise surveys in Hounslow
Noise assessment for bars, clubs and venues, and for homes planned near them.
Existing buildings and refurbishment
- Asbestos surveys in Hounslow
Surveys that find and record asbestos-containing materials, and explain which survey type a building needs.
- Management asbestos survey in Hounslow
A survey of the accessible parts of an occupied building so the dutyholder can manage asbestos during normal use.
- Refurbishment and demolition survey in Hounslow
An intrusive survey of the areas affected by planned refurbishment or demolition, carried out before work starts.
- Pre-purchase asbestos survey in Hounslow
An asbestos survey arranged before buying a property, so the buyer knows what is present and where.
- Retrofit assessments in Hounslow
A whole-house assessment of a home's condition and energy use, used to plan retrofit measures.
- Borescope inspections in Hounslow
Camera inspection of cavities and voids through small holes, without opening up the structure.
- EPC in Hounslow
Energy Performance Certificates for homes and commercial buildings that are built, sold or let.
Planning applications
- Energy statements in Hounslow
Energy statements written for planning applications, setting out how a scheme meets the council's energy policy.
- London plan energy assessments in Hounslow
Energy assessments for London schemes, following the Mayor's energy hierarchy and carbon reporting requirements.
- Sustainability statements in Hounslow
Sustainability statements for planning applications, covering the topics the council's policies ask for.
- Acoustic design in Hounslow
Acoustic design advice from the early stages of a project, so construction details meet sound requirements.
- Noise surveys in Hounslow
Noise impact assessment for planning applications, and the starting point for the specific noise surveys below.
- Environmental noise survey in Hounslow
Measurement of existing noise levels at a site, used to inform design and planning submissions.
- Residential noise surveys in Hounslow
Noise assessment for new homes, showing that internal and external noise levels will be acceptable.
- Road and rail noise surveys in Hounslow
Assessment of road and railway noise affecting a proposed development.
Hounslow aircraft noise and residential conversions
Policy EQ5 in the Hounslow Local Plan 2015 to 2030 addresses aviation, transport and noise-generating uses. It calls for noise assessments for major schemes and changes of use to a more noise-sensitive use. The assessment should cover internal conditions, external amenity space and effects on surrounding uses. A conversion to homes should therefore address the intended residential use, not simply describe the former building.
EQ5 also expects appropriate room arrangement, insulation and mitigation, and identifies Heathrow-related noise as a local concern. Commission noise surveys early enough to inform acoustic design. Under EQ5’s requirements, new plant, including ventilation equipment, must avoid harm to neighbouring amenity and meet the stated background-noise criterion. Coordinate plant positions, glazing and ventilation before fixing elevations; a later specification change may alter the acoustic solution.
Hounslow EQ1 and the London Plan energy case
The council records adoption of the Hounslow Local Plan on 15 September 2015. Its Policy EQ1 requires developments to meet London Plan carbon-reduction requirements. For major development it also addresses connection to nearby decentralised energy networks, with feasibility or viability evidence where connection is not reasonably possible. This makes the energy strategy a site-planning question as well as a calculation exercise.
Read that local policy alongside the London Plan 2021, rather than treating the older borough document as the sole specification. Our London Plan energy assessments and energy statements can set out the proposed approach and supporting calculations. For a Hounslow major scheme, establish the network position, building uses and heating strategy before modelling options. EQ1’s network expectations mean an unexplained choice of isolated systems may leave part of the local policy case unanswered.
Hounslow EQ2: construction evidence beyond energy
Policy EQ2 requires a sustainability statement for major development. It also covers passive solar design, water efficiency, drainage, materials and urban greening. Its standards table expressly allows for superseding national standards. Use a sustainability statement to explain the project’s response, rather than presenting an energy calculation as the whole sustainability submission.
For Hounslow housing, EQ2 points to London Plan standards, including adopted optional Building Regulations requirements. Identify the applicable water target before selecting fittings and commissioning water calculations. The local policy’s passive-design approach also supports considering orientation, shading and ventilation together. An overheating assessment can test the proposed design where needed; EQ2 alone should not be read as a verified assessment trigger for every extension.
| Hounslow project | EQ2 evidence to organise |
|---|---|
| Major development | Sustainability statement |
| New non-residential development over 500 square metres | BREEAM assessment with Excellent as the stated minimum, subject to superseding standards |
Source: Source: Hounslow Local Plan 2015 to 2030, Policy EQ2 and Table EQ2.1. Read the policy.
Hounslow additional HMO licensing: check the whole building
The council’s 2025 additional licensing designation covers the whole borough. It took effect on 11 December 2025 and is scheduled to end on 10 December 2030 unless revoked earlier. Subject to exemptions, it includes section 254 HMOs occupied by three or more people in two or more households. Properties requiring mandatory licensing are excluded from this additional scheme, not from licensing altogether.
The designation also includes certain section 257 converted-building HMOs where the building and all dwellings are in the same ownership or effectively the same control. For a converted Hounslow property, establish ownership and the building-wide arrangement before relying on a single flat’s occupancy. Review fire risk assessments, legionella risk assessments and energy records against the actual management duties. These are separate assessment services, not a claim that the designation itself requires all three reports in every case.
Hounslow submissions and building control evidence
Use the council’s planning route for the application and its building control route for the separate construction approval process. For Hounslow schemes responding to EQ1, EQ2 and EQ5, keep the planning reports aligned with the eventual fabric, services and ventilation specifications. Ask the relevant council service to confirm the submission scope before ordering tests or relying on an earlier report.
Building compliance questions in Hounslow
Does a Hounslow residential conversion need a noise assessment?
EQ5 calls for one where the change is to a more noise-sensitive use, as well as for major schemes. Establish the previous use and assess the proposed homes, including outdoor amenity space.
Which Hounslow schemes need a sustainability statement?
EQ2 specifies major development. The statement should address the wider construction and resource issues in that policy, not only energy demand.
Is Hounslow additional HMO licensing limited to selected wards?
No. The 2025 designation covers the whole borough. Its occupancy tests, converted-building provisions and exemptions still need checking for the property concerned.
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