Quality.

    Externals and handover: what good looks like

    Drives, paths, landscaping, presentation and pre-handover checks.

    What good looks like

    Externals and handover: what good looks like

    Levels, thresholds, drainage and access finished as designed, the compliance paperwork complete, and the customer handed a home that works and a demonstration of how to use it.

    External works decide two things that are hard to fix later: whether water runs away from the building, and whether the approach is actually accessible. Paving laid to the wrong level either drowns the threshold or breaches the DPC — both are common, and both are dug up. Falls should run away from the dwelling to a gully or a permeable area, with the DPC kept clear above finished level and the accessible threshold upstand within the permitted limit. Check gullies, channels and the drainage of the driveway itself, not just the roof water. Handover is a document exercise as much as a physical one. Certificates, test results, warranties and the home user guide should be assembled as the build proceeds, and the demonstration should cover heating, ventilation, controls, isolation points and the water efficiency measures fitted.

    Basis in regulation

    Before you start

    Before you start: externals and handover

    Checks to clear before the paving goes down and the keys are cut.

    Take levels around the plot and check them against the DPC and the threshold before any sub-base is laid; this is the last easy moment to adjust. Confirm the accessible approach route, its gradient and width, and that the driveway drainage does not discharge onto the highway. Assemble the handover pack as the build closes: electrical and gas certificates, air test and water efficiency calculations, commissioning records, warranties and the home user guide. Book the customer demonstration with enough time to actually walk the controls rather than hand over a folder at the door.

    Basis in regulation

    Key requirements

    Application of external render

    External render should only be applied to clean, prepared surfaces free from contamination, dust, or loose particles to ensure adequate adhesion. The render must be mixed to ensure colour consistency if pigments are specified, and applied in the correct number and thickness of coats as per the manuf

    External render should only be applied to clean, prepared surfaces free from contamination, dust, or loose particles to ensure adequate adhesion. The render must be mixed to ensure colour consistency if pigments are specified, and applied in the correct number and thickness of coats as per the manufacturer's instructions. Appropriate trims should be used to form corners, returns, and features, also in accordance with manufacturer guidelines.

    Basis in regulation

    Liquid fuel appliance terminal positioning

    Terminals for liquid fuel appliances must be positioned to ensure adequate separation from combustible materials and other parts of the building. Balanced flue terminals specifically require clear space for unimpeded air intake to the appliance. Masonry terminals should adhere to the requirements fo

    Terminals for liquid fuel appliances must be positioned to ensure adequate separation from combustible materials and other parts of the building. Balanced flue terminals specifically require clear space for unimpeded air intake to the appliance. Masonry terminals should adhere to the requirements for solid fuel appliances, while other terminal types must be installed in accordance with manufacturer's instructions.

    Basis in regulation

    Weatherproofing Building Envelope Penetrations

    All penetrations of the building envelope, such as those for heat pump systems, must be thoroughly weatherproofed. This involves sealing to prevent air leakage and moisture ingress, using appropriate flashings and robust fixings. Relying solely on sealants for weatherproofing at these critical inter

    All penetrations of the building envelope, such as those for heat pump systems, must be thoroughly weatherproofed. This involves sealing to prevent air leakage and moisture ingress, using appropriate flashings and robust fixings. Relying solely on sealants for weatherproofing at these critical interfaces is not acceptable practice, as they often degrade over time.

    Basis in regulation

    Installation of brick slip cladding systems

    Brick slip cladding systems, including proprietary carriers, must be specified and fixed in strict accordance with the design and manufacturer's recommendations, taking into account any height restrictions. The setting out should minimise cutting of slips, particularly around openings and at corners

    Brick slip cladding systems, including proprietary carriers, must be specified and fixed in strict accordance with the design and manufacturer's recommendations, taking into account any height restrictions. The setting out should minimise cutting of slips, particularly around openings and at corners, and coursing should align with lintel heights.

    Basis in regulation

    MVHR terminal separation

    To prevent cross-contamination, MVHR intake terminals must be adequately separated from exhaust terminals and other potential pollution sources, typically by a minimum of 1 metre on plan. Greater separation distances may be required from sources such as soil and vent pipes, boiler flues, or biomass/

    To prevent cross-contamination, MVHR intake terminals must be adequately separated from exhaust terminals and other potential pollution sources, typically by a minimum of 1 metre on plan. Greater separation distances may be required from sources such as soil and vent pipes, boiler flues, or biomass/solid fuel chimney terminals.

    Basis in regulation

    Meter cabinet openings and location

    Openings for utility meter cabinets must be structurally sound and designed to prevent moisture ingress into the building. Meter boxes and associated equipment should be positioned in an easily accessible location, protected from potential damage, in consultation with the relevant utility network op

    Openings for utility meter cabinets must be structurally sound and designed to prevent moisture ingress into the building. Meter boxes and associated equipment should be positioned in an easily accessible location, protected from potential damage, in consultation with the relevant utility network operators.

    Basis in regulation

    Mortar for brick slip systems

    Mortars, proprietary mortars, and grouts for brick slip systems must be specified to ensure that each joint can be adequately filled and appropriately struck. The specification should also support neat cutting of the insulation carrier and positioning around openings to avoid excessive cutting of sl

    Mortars, proprietary mortars, and grouts for brick slip systems must be specified to ensure that each joint can be adequately filled and appropriately struck. The specification should also support neat cutting of the insulation carrier and positioning around openings to avoid excessive cutting of slips.

    Basis in regulation

    Movement joints in external render systems

    Movement joints within the backing wall must extend through external insulated render systems to accommodate differential movement and prevent cracking. These joints should be designed and installed strictly in accordance with the render system manufacturer's specifications.

    Movement joints within the backing wall must extend through external insulated render systems to accommodate differential movement and prevent cracking. These joints should be designed and installed strictly in accordance with the render system manufacturer's specifications.

    Basis in regulation

    Incoming utility supply compliance

    The incoming utility supply to the meter box, whether for electricity or gas, must be installed strictly in accordance with the specific requirements and regulations of the service provider. This ensures safe connection, correct metering, and operational integrity.

    The incoming utility supply to the meter box, whether for electricity or gas, must be installed strictly in accordance with the specific requirements and regulations of the service provider. This ensures safe connection, correct metering, and operational integrity.

    Basis in regulation

    Correct Fixing Installation and Material Isolation

    The type, size, number, position, and fitting tolerance of fixings must precisely follow the manufacturer's recommendations for effective system securement. Critical considerations include using locking nuts and washers to prevent loosening, and ensuring the isolation of dissimilar metals to avoid g

    The type, size, number, position, and fitting tolerance of fixings must precisely follow the manufacturer's recommendations for effective system securement. Critical considerations include using locking nuts and washers to prevent loosening, and ensuring the isolation of dissimilar metals to avoid galvanic corrosion. Additionally, aluminium components must be isolated from direct contact with cementitious materials.

    Basis in regulation

    Raised Ground Levels at Accessible Entrances

    When external ground levels are raised for accessible entrances, specific measures are required to protect the building from moisture. This includes installing appropriate drainage, ensuring ground slopes away from the structure, and providing additional cavity ventilation. The use of non-splashing

    When external ground levels are raised for accessible entrances, specific measures are required to protect the building from moisture. This includes installing appropriate drainage, ensuring ground slopes away from the structure, and providing additional cavity ventilation. The use of non-splashing surface finishes and upstands can also help protect timber frame elements from moisture.

    Basis in regulation

    Key requirements: externals and handover

    The requirements most often picked up at the final inspection.

    Finished external levels at least the required distance below the DPC, with paving falling away from the building. Accessible threshold upstand within the permitted limit and chamfered where required. Approach route width, gradient and surface suitable for level access. Gullies, channels and driveway drainage installed, connected and running clear, with no discharge to the highway. Manhole covers to the correct duty and set flush and level. Boundary treatments, guarding to changes in level and external lighting complete. Water efficiency calculation within the required limit and recorded. Certificates, commissioning records and warranties assembled, and the customer demonstration completed and signed.

    Basis in regulation

    Secure Fixing of Heat Pump Systems

    Heat pump systems must be securely fixed, ensuring they do not compromise the building's weather resistance or structural integrity. Foundations and anchor points for standalone units, or attachments to existing structures, require engineering design to safely withstand self-weight, wind loads, impo

    Heat pump systems must be securely fixed, ensuring they do not compromise the building's weather resistance or structural integrity. Foundations and anchor points for standalone units, or attachments to existing structures, require engineering design to safely withstand self-weight, wind loads, imposed loads, and dynamic forces. The supporting structure's capacity to handle these loads and prevent adverse effects from movement or vibration must be assessed.

    Basis in regulation

    Weatherproofing and material compatibility at interfaces

    All interfaces between building elements and installed equipment must be robustly weatherproofed to prevent air leakage and moisture ingress, using appropriate flashings and secure fixings. Reliance solely on sealant for weatherproofing is unacceptable. Additionally, incompatible materials, such as

    All interfaces between building elements and installed equipment must be robustly weatherproofed to prevent air leakage and moisture ingress, using appropriate flashings and secure fixings. Reliance solely on sealant for weatherproofing is unacceptable. Additionally, incompatible materials, such as aluminium and cementitious products, must be isolated to prevent degradation.

    Basis in regulation

    Material Compatibility and Weatherproofing at Interfaces

    Aluminium and its alloys must be isolated from direct contact with cementitious materials to prevent corrosion. All interfaces where a heat pump system meets the building envelope require robust weatherproofing, sealed effectively to prevent air leakage and moisture ingress into the structure. Such

    Aluminium and its alloys must be isolated from direct contact with cementitious materials to prevent corrosion. All interfaces where a heat pump system meets the building envelope require robust weatherproofing, sealed effectively to prevent air leakage and moisture ingress into the structure. Such weatherproofing should primarily rely on physical flashings and durable fixings, as sealants alone are not considered a sufficient long-term solution.

    Basis in regulation

    Durable Fixings for Heat Pump Systems

    Heat pump systems must be securely fixed to the building structure using durable materials that conform to relevant British Standards or have an independent assessment. Suitable fixing materials include various grades of stainless steel, phosphor bronze, silicon bronze, or mild steel with appropriat

    Heat pump systems must be securely fixed to the building structure using durable materials that conform to relevant British Standards or have an independent assessment. Suitable fixing materials include various grades of stainless steel, phosphor bronze, silicon bronze, or mild steel with appropriate protective coatings for corrosion resistance. Aluminum alloys can also be used if specified correctly.

    Basis in regulation

    Critical dimensions at this stage

    Browse all critical dimensions
    England
    Low-rise traditional

    Original editorial guidance based on publicly available Approved Documents. Not building control approval, a warranty determination, or a substitute for the full source document.

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