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Listed Building Consent (drainage)
— Statutory consent required for external drainage alterations to a listed building.
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Listed Building drain survey
— Drain survey carried out at a listed building, taking heritage protection into account.
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Listed building drainage emergency
— Drainage emergency in listed building, requiring conservation-aware engineers and consent considerations.
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Local Authority Building Control (LABC)
— Trade body representing council Building Control surveyors enforcing UK Building Regulations.
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Localised drain repair
— Targeted repair confined to a short section of pipe rather than the full run.
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Locating wand (sonde transmitter)
— Transmitter inside a camera head that emits a signal for surface location.
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London Borough drainage requirements
— Local borough requirements supplementing UK Building Regulations and SuDS guidance.
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Loss adjuster drain inspection
— Independent drainage inspection commissioned by loss adjuster to verify insurance claim cause.
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Macerating toilet (Saniflo)
— Toilet with a built-in macerator and pump for connection to small bore pressurised pipework.
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Macerator emergency
— Urgent response to failed macerator unit, often in basement or attic bathrooms.
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Macerator failure (Saniflo)
— Failure of a macerator pump such as Saniflo, preventing waste from a basement WC reaching the drain.
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Macerator unblocking
— Clearance of a macerator pump and its small bore discharge pipe.
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Macerator unit
— Small pump and grinder under a toilet or basin that lifts waste through narrow pipework.
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Maisonette
— Flat occupying two or more floors with its own external entrance, often above shops.
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Manhole
— Large access chamber over a drain or sewer allowing entry for inspection and maintenance.
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Manhole condition survey
— Survey assessing the structural and functional condition of drainage manholes and chambers.
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Manhole cover (cast iron)
— Heavy ferrous lid over a drainage chamber, traditional UK pattern in heritage settings.
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Manhole cover (composite)
— Lightweight non-metallic chamber lid using polymer or composite materials.
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Manhole cover replacement
— Removal and renewal of an inspection chamber cover and frame.
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Manhole rehabilitation
— Restoration of an inspection chamber to acceptable structural and watertight condition.
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Manhole step iron
— Galvanised or plastic-coated metal rung built into the wall of a deep drainage chamber.
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Mansion flat (Victorian conversion)
— Flat created by subdividing a large Victorian house, typically with retrofitted drainage.
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Manual Handling Regulations 1992
— UK regulations setting out duties to assess and reduce risks of injury from manual handling.
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MDPE pipe (medium-density polyethylene)
— Blue medium-density polyethylene pipe used primarily for cold water mains supply.
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Mechanical rodding
— Manual clearance of drains using flexible rods pushed through pipework.
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Mews property
— Converted stable or coach house behind main street, with limited rear drainage access.
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Mid-terrace house
— House located in the middle of a terraced row, with party walls on both sides.
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Mild steel pipe
— Black uncoated steel pipe used for gas, heating and industrial drainage applications.
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Mini camera (push rod)
— Small camera on a flexible push rod used to inspect domestic drains.
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Mini excavator (1.5 to 3 tonne)
— Small tracked excavator used for drainage trenching and chamber excavation.
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Mini jetter (portable)
— Compact portable jetter used inside buildings and for small waste pipes.
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Modular house
— House built off-site in modules then assembled on plot, with prefabricated drainage runs.
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Mop sink (cleaner's sink)
— Low sink used for filling buckets and emptying mop water in commercial settings.
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Mould around drains
— Black or pink mould growth around drain outlets, gullies and overflow areas.
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Mud and silt blockage
— Drain blockage caused by ground silt or mud entering the pipe through cracks or joints.
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Mud gully
— Gully with a deep sump designed to collect silt and mud before the main drain.
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New build (post-2010)
— Modern property built after 2010, with separate drainage and SuDS requirements.
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NHBC standards
— Technical standards published by the National House Building Council for new-build housing.
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NICEIC certification
— Industry certification scheme for UK electrical contractors, with drainage cross-reference.
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No-dig drain repair
— Repair methods that fix drains internally without significant excavation.
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Non-return valve (NRV)
— Valve preventing flow reversal in a pipe to protect pumps and supplies.
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Office building
— Commercial building used primarily for office work, with WC and kitchenette drainage.
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Oil spillage drainage
— Emergency response to oil spills entering drainage, with interceptor checks and EA notification.
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Open joint (drain)
— Drain joint with a gap between adjoining pipes, allowing root ingress and water loss.
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Open-cut excavation
— Traditional drain repair by digging a trench down to and along the pipe.
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Out-of-hours drainage
— Drainage response outside normal business hours, including evenings and weekends.
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Package treatment plant
— Compact biological treatment unit producing higher quality effluent for off-mains properties.
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Pan and tilt camera (drain)
— Drain camera head able to rotate and tilt independently to inspect defects in detail.
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Party wall drainage report
— Drainage report supporting a party wall award where works affect shared or adjacent drains.
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Patch repair (drain)
— Localised resin repair installed inside a pipe to seal a defect at one point.
