Bathrooms in terraces, parade flats and older Harrow Road houses
A Kensal Rise bathroom is one room, but Brent’s records show the questions that reach beyond it: a window that might overlook a neighbour, a lease a neighbour said limits where a bathroom may go, the size of showers in a shared house, and surface water and the drains. A standalone bathroom is welcome. This page covers those decisions, the recorded features of older buildings and building control.
Serving Kensal Rise from our Hampstead studio · NW3 6DN 020 7101 3168
Start here
Bathroom renovation in Kensal Rise at a glance
Before a Kensal Rise bathroom is moved or enlarged, look at the outside walls and roof around it. Brent’s records here show how a bathroom can reach the outside: for an enlarged bathroom window on Clifford Gardens in 2020, before the street was in a conservation area, an officer recommended obscure glass, and in the 2014 permission for homes in Kensal Rise Library smaller rooflights were planned over the bathrooms. On two locally listed buildings, Brent’s list records the downpipes and hoppers as features. Inside a flat, the lease and the shared drains can limit the layout too.
For the whole area, including conservation areas, permissions and working hours, read our Kensal Rise renovation guide.
Approved guide prices
What does a bathroom renovation cost in Kensal Rise?
A typical bathroom renovation in Kensal Rise costs £10,000–£30,000 excluding VAT. The final price depends on the scope, the specification and the complexity of the room, and a fixed written price follows the visit and the design.
Scope of work
Typical cost
Typical bathroom renovation
£10,000–£30,000
The figure excludes VAT. A standalone bathroom gets its own room-specific quotation; try the cost calculator for a first figure.
The buildings
Downpipes, rooflights and basement storeys in Brent’s records
Brent’s January 2020 local list and its planning register describe features of older Kensal Rise buildings that matter once a bathroom’s pipes, light or drainage reach the outside.
Kensal Rise Library, Bathurst Gardens, is on Brent’s local list, and the entry records its cast-iron downpipes and hoppers as a feature. When Brent granted homes on its part ground and upper floors in November 2014, the committee report accepted eleven new rooflights in the main roof, sized by the rooms they serve, with the smaller ones for bathrooms and other non-habitable rooms, and found they would not be prominent. That was decided under the plan then in force, and the report said the building was not on the local list in Brent’s 2004 plan.
On Harrow Road, in the Kensal Green Conservation Area, the list records attractive metal downpipes and hoppers on 810, a double-fronted house of 1921–22, and describes 836–840 as a terrace of three Georgian town houses of three storeys plus basement. The list says nothing about bathrooms. If a bathroom is planned in a new or enlarged basement, read Brent’s Basement SPD.
Will a new or larger bathroom window need obscure glass?
Possibly. In January 2020, before Clifford Gardens was in a conservation area, Brent granted side and rear extensions to a house and a flat there, and the officer recommended that the house’s two enlarged first-floor side windows, serving a utility area and a bathroom, be obscure glazed and non-opening below 1.7m from the floor, to prevent overlooking. For unlisted houses outside conservation areas, Brent’s 2025 extensions guidance accepts bathroom and WC windows in the side wall of a single-storey side extension in general, on condition that the glass is obscured.
Brent: viewing or commenting on planning applications (search Brent’s planning register) · Brent Residential Extensions and Alterations SPD, January 2025 (PDF)
A new en-suite in a flat
Does planning permission settle where a bathroom can go?
No. In October 2018, before Clifford Gardens was in a conservation area, Brent granted a rear dormer loft conversion for a flat there although a neighbour objected that the lease restricted adding or moving a bathroom or kitchen and that the new shower and WC had no drainage route. The officer answered that an en-suite in a loft conversion is generally acceptable in planning terms, being mainly an internal change, and left the lease and drainage for the applicant to resolve with the other parties and under the Building Regulations. That was one officer’s view in one case.
Brent: viewing or commenting on planning applications (search Brent’s planning register) · LEASE: alterations and home improvements
Showers in a shared house
Do Brent’s HMO shower sizes apply to my bathroom?
Only if the home is, or will become, a house in multiple occupation. In April 2025 Brent refused a seven-bedroom HMO in a maisonette on Chamberlayne Road, for reasons including the standard of accommodation; the officer’s report found two en-suite showers of about 0.7 by 0.7m against the HMO SPD’s 0.8 by 0.8m minimum, placed so that two bedrooms would be long, narrow and short of daylight, while one shared bathroom with a bath for four occupants was acceptable. A revised six-bedroom scheme, its en-suites meeting the minimum, was granted in October 2025.
Brent: viewing or commenting on planning applications (search Brent’s planning register) · Brent Houses in Multiple Occupation SPD, adopted 3 November 2022 (PDF)
Surface water and the drains
Does flooding matter for a bathroom on the lowest floor?
Check before you plan one there. Brent’s Local Flood Risk Management Strategy, approved by its Cabinet in April 2025, says Brent planned to start a flood alleviation feasibility study in 2024 in the Kilburn and Kensal Rise area, aimed at reducing the number of properties shown at risk on the Environment Agency’s surface water mapping. The passage names no street, and gives no result for the study. If the bathroom is part of a new basement, Local Plan Policy BD3 requires a suitable pumped device to guard the basement against sewer flooding.
Brent Local Flood Risk Management Strategy, February 2025, approved by Brent’s Cabinet on 7 April 2025 (PDF) · Brent Cabinet decision: Local Flood Risk Management Strategy approved, 7 April 2025 · Brent Local Plan 2019–2041 (accessible version) · Check long-term flood risk in England
Working hours, skips, parking and the conservation area maps for the whole area are in our Kensal Rise guide. Local guidance checked ; requirements depend on the address, the building and the complete proposal.
What the work covers
Waste, waterproofing and sign-off: a Kensal Rise bathroom in three parts
The waste route to the stack
The survey finds the soil stack, measures the fall a new waste can have under the floor and decides whether every pipe can stay inside the building. If one must run outside, its position and finish are drawn and agreed before work starts, with a note of any downpipes or hoppers on that wall that are to stay untouched.
Waterproofing and the ceiling below
Under a walk-in shower or a tiled floor the base is lined, sealed and tested before any tile goes down, and the joists are checked for old notches, rot and spring. In a flat the room below is a neighbour’s home, so access panels for traps and valves are planned in, and a leak can be dealt with without lifting the finished floor.
Extract, wiring and the certificates
Extract is matched to the room’s size and run to the outlet agreed at survey, preferably on a rear wall. Brent lists electrical work not certified by a registered competent person among the projects that need building regulation approval, so the circuits for the fan, lights and any heated rail are done by a registered electrician or approved through Brent. The handover file holds every certificate.
Brent: before you apply to building control
How we work
How we run a Kensal Rise bathroom renovation
Visit
We see the room, trace where the stack runs, and check which floor it is on and what lies beneath.
Survey
The drainage falls, the extract route and the floor build-up at the door are measured before a layout is drawn.
Design
The layout, waterproofing and storage are drawn; where a floor or wall changes, our own architects and structural engineers design it.
Price
You receive a fixed written price once the design and fittings are agreed.
Installation
The dates, and any days without a working bathroom, are agreed before work starts.
Handover
Testing, then care notes for the finishes and fittings. Completed work carries a 12-month defects-rectification period under the JCT contract terms.
Real projects, clearly located
Examples of our bathroom renovation work elsewhere in London
None of these projects is in Kensal Rise. Each card names where the work was done, so you can judge the finish and the approach before you brief your own.
Say which floor the bathroom is on, what lies above and below it, and whether the home is a house, a flat over a shop or a shared house. Photograph the room and the outside walls nearest to it, showing the soil stack, downpipes, any vent and the windows that face neighbours.
Gather the papers that limit it
Send the lease clauses on alterations, bathrooms and drainage if the home is a flat, and any earlier permission for the building with its conditions, such as obscure glazing on a side window. If the home is let as a house in multiple occupation, say so, because different standards then apply.
Say who will use it and how
List the fittings you want, whether this is the only bathroom in the home and how the household will manage while it is out of use. If anyone needs level access or grab rails now or soon, mention it, and send any occupational therapist’s assessment you already have.
Ready to take the next step? Send the address and a short outline of the work.
Will you take on one Kensal Rise bathroom by itself?
Yes. We take on a standalone bathroom here as readily as a whole home, from the family bathroom of a Clifford Gardens house to a shower room over a Chamberlayne Road shop or a bathroom in one of the older Harrow Road houses. Send the room’s measurements and photographs of it and of the outside walls, and say whether the home is a house, a flat or a shared house, so the consents for the address can be checked first.
Does a bathroom refit need building control in Brent?
It depends on the work. Brent offers a building notice, meant mostly for smaller works on homes, under which work may begin as soon as the notice is accepted, which is usually within 48 hours, and full plans, usually for bigger jobs or where Thames Water or the Fire Brigade has to be consulted. Brent must be told when the work is finished, or it cannot issue a completion certificate, which it says will affect a later sale. For unauthorised earlier work, an owner can seek a regularisation certificate after the event.
Brent: the building control application process explained
Is there help with adapting a bathroom for a disability?
Possibly. Brent can support you through major changes to a home when an occupational therapist thinks someone would benefit from them, and its examples include a wet room, a level-access shower and a wash-and-dry toilet. Owners, private tenants and housing association tenants with their landlord’s approval can ask. The Disabled Facilities Grant is means-tested, starts with an assessment by Brent’s occupational therapy service and can fund a downstairs bathroom among other things; where the cost passes a threshold Brent publishes and more help is needed, a discretionary grant might pay the extra, depending on income.
Brent: changes to your home (adaptations) and the Disabled Facilities Grant
What should I check before adding an en-suite in the loft?
Start with the drainage and the headroom. A loft en-suite needs a route for its waste down to the stack, often through the rooms below, and enough height over the shower and WC once the roof slope is allowed for. In a flat, read the lease and ask the freeholder before drawings go far. The room also needs extract to the outside, so agree where the outlet will go before the layout is fixed.
When Building Regulations approval is needed · LEASE: alterations and home improvements
Can a bath be replaced with a walk-in shower in a flat?
Usually, once the floor is understood. A level or low shower tray needs depth for the waste trap and a fall to the drain, which may mean lifting the floor or building it up, and in a flat that floor is over a neighbour’s ceiling. Check the lease for any terms on bathrooms, floors or new pipework, and plan the waterproofing so that it is tested before tiling.
LEASE: alterations and home improvements
How much does a bathroom renovation cost in Kensal Rise?
A typical bathroom renovation in Kensal Rise costs £10,000–£30,000 excluding VAT. The final price depends on the scope, specification and complexity of the project. We give a fixed written price after the visit and the design.
Book a free feasibility visit
Talk to us about your Kensal Rise bathroom
Tell us the address and what you want to change in your Kensal Rise bathroom. We reply within one working day, Monday to Friday, 8am to 6pm.
Or call 020 7101 3168. We serve Kensal Rise from our studio at Unit 3, Palace Court, 250 Finchley Road, London NW3 6DN.
