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Interwar semis, split into flats, still on the original pipework

Brent was largely built in one burst. The British Empire Exhibition at Wembley Park in 1924 and 1925 pulled development north and west, and the borough filled in with speculative semi-detached housing over the following decade. Brent Council's own Sudbury Court conservation area appraisal records houses built there by Comben and Wakeling between 1927 and 1936, surrounded by similar developments running from the late 1920s to the end of the 1930s.

The 2021 Census counted 118,612 households in Brent: 22.3% semi-detached, 14.9% terraced, 6.0% detached, 38.0% in purpose-built blocks and 16.5% in part of a converted or shared house. That last figure is the one that generates our call log. Brent's own conservation appraisal notes continuing pressure to split larger houses into smaller multi-occupancy units, and a 1930s semi that was designed for one family with one bathroom now routinely serves four or five households.

What that does to the plumbing is predictable. One 22mm cold main and one small boiler are asked to feed three or four kitchens and bathrooms. Waste from a first-floor shower room added in 2008 runs in 40mm pipe at a lazy fall into a stack that was sized for a single bathroom. Original galvanised and early copper pipework sits behind plaster nobody has opened since the conversion. When it fails it does not fail politely, and it usually fails at the point where the newer work meets the older work.

Density makes it worse. Brent's average household size is 2.83 people against 2.54 across London, and 15% of Brent households contain five or more people. Overcrowding, measured on the bedroom standard, runs at 17% in Brent against 11% across London and 4% across England and Wales, which places Brent third highest of any local authority in England and Wales. Ward figures range from 9% in Queens Park to 30% in Wembley Central. More people through the same fittings means hot water systems, waste runs and drainage in Brent do more work than the same equipment does anywhere else we operate.

Licensing is the backdrop to almost every Brent landlord job

Brent runs three licensing regimes at once. Mandatory HMO licensing applies as it does everywhere. On top of it, an additional HMO licensing designation covers the whole area of the London Borough of Brent, in force from 2 February 2026 and running for five years to 2 February 2031, catching HMOs with three or four occupants from two or more households, section 257 converted-flat HMOs and HMOs inside purpose-built blocks. And selective licensing covers the rest of the private rented sector across 21 of Brent's 22 wards, with Wembley Park the only exclusion.

The conditions matter to us because several of them are plumbing and heating conditions. Brent's HMO licence conditions require the licence holder to provide an adequate and efficient fixed heating system with adjustable controls, capable of maintaining an indoor temperature of at least 21°C in habitable rooms. Kitchen sinks must have a constant supply of hot and potable cold water, properly connected to the drainage system via a suitable trap. Each bath and shower must have a constant, freely available supply of hot and cold water. Each WC compartment needs a wash hand basin with a constant hot and cold supply. The property must have an effective system, above and below ground, for the drainage of foul, waste and surface water. Where gas is supplied, an annual Gas Safe certificate must be produced to the council.

That is a list of things an engineer can be asked to certify, and breaching them is expensive: Brent can impose a civil penalty of up to £30,000 per offence as an alternative to prosecution, alongside rent repayment orders. So when a Brent landlord calls us about a cold radiator or a slow-draining basin, the job is rarely just the fault. It is the fault plus the paperwork. We attend, fix, and give you documentation that maps onto the licence condition it satisfies.

The selective licence conditions are lighter: an annual gas safety test and a certificate to the tenant at the start of occupation, but no 21°C requirement and no hot water amenity standard. It is worth knowing which regime your property sits under before you commission work, because the specification is genuinely different.

Wembley Park is a different building stock entirely

At the other end of the borough's housing spectrum, Quintain had completed 6,000 homes at Wembley Park by September 2025, heading towards 8,400. When finished, almost 6,000 of those will be Build to Rent, which the developer describes as the largest single Build to Rent site in the UK. Wembley Park is also the one Brent ward left out of selective licensing, which is consistent with institutional rather than individual landlords.

New-build apartment plumbing fails differently from a converted semi. There is no original pipework to blame. Instead the faults cluster around pressurised systems and shared plant: heat interface units, sealed system pressure loss, filling loops left open, expansion vessels losing charge, thermostatic mixing valves scaling up, and shower pumps in flats with insufficient head. Access is often through a building manager rather than a front door, and the isolation valve you need is in a service riser cupboard on the corridor.

The heating split across the borough reflects this. Brent's Census figures show 69.5% of households on mains gas only and 13.4% on electric heating only, but that headline hides the property-type divide: electric-only heating runs at 21% in flats against 4% in houses. If you live in a Brent flat there is a one-in-five chance nobody can send you a gas engineer for your hot water problem, because there is no gas involved. We send someone who can work on unvented cylinders and immersion systems instead.