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Harrow on the Hill HA1 · Bathroom renovation

Bathroom renovation in Harrow on the Hill

Listed High Street rows, a timber-framed cottage and hillside pipes

A bathroom on the Hill may sit inside a listed building on the High Street, in a timber-framed cottage near London Road, in a Gothic house by E.S. Prior, or in a terrace whose repeated pattern includes its rainwater goods. Below, you will find what Harrow’s records say about those buildings and their pipework, followed by the approvals, drains, ventilation and grants that apply to the room itself.

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Serving Harrow on the Hill from our Hampstead studio · NW3 6DN
020 7101 3168

Start here

Bathroom renovation in Harrow on the Hill at a glance

Two things come first for a bathroom here: whether the building is listed, and where any new pipe or vent will show. Harrow’s list includes groups on the High Street, Toll Gate Cottage in the Sudbury Hill conservation area and 60–66 Middle Road in Roxeth Hill, among many other entries on the Hill. On the outside, Mount Park’s 2008 strategy asks for drainpipes to be kept as hidden as possible, and the Village appraisal counts rainwater goods among the repeated features of its terraces. Fittings and finishes are chosen once those answers are known.

Harrow: statutory listed buildings, list updated April 2016 (PDF) · Planning Data: Toll Gate Cottage, grade II, list entry 1358654 · Harrow: Sudbury Hill Conservation Area Appraisal, adopted May 2008 (PDF) · Planning Data: 60-66 Middle Road, grade II, list entry 1079671 · Harrow: Roxeth Hill Conservation Area Appraisal, adopted May 2008 (PDF) · Harrow: Mount Park Estate Management Strategy, adopted May 2008 (PDF) · Harrow: Harrow on the Hill Village Conservation Area Appraisal, adopted May 2008 (PDF)

For the whole area, including conservation areas, permissions and working hours, read our Harrow on the Hill renovation guide.

Approved guide prices

What does a bathroom renovation cost in Harrow on the Hill?

A typical bathroom renovation in Harrow on the Hill 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 workTypical 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

Listed buildings on the Hill where a bathroom needs care

Harrow’s statutory list and the 2008 appraisals record listed buildings across the Hill, from High Street groups to a timber-framed cottage and a row of houses by E.S. Prior.

On the High Street, Planning Data records 25A, 25B and 27–35 as one grade II list entry, with a start date of 24 February 1982, and 82–86 as another, with a start date of 28 November 2002. Harrow’s statutory list, updated in April 2016, also records Nos. 45, 47 and 49, listed on 25 May 1983, and Nos. 104 and 106, listed on 18 February 1974, both grade II. Each entry covers particular numbers, so confirm that yours falls inside one before a bathroom is planned.

Planning Data: 25A, 25B and 27-35 High Street, grade II, list entry 1358629 · Planning Data: 82-86 High Street, grade II, list entry 1272460 · Harrow: statutory listed buildings, list updated April 2016 (PDF)

Toll Gate Cottage, near the junction of Roxeth Hill and London Road in the Sudbury Hill conservation area, is listed grade II. Its appraisal says it is timber framed and is thought to have been part of a stable and coach house, behind a later stuccoed façade with Gothic lancet casements. In Roxeth Hill, the appraisal describes 60–66 Middle Road as grade II listed Gothic houses by E.S. Prior, of two and a half storeys in a picturesque style, with rough-cast work alternating with tile hanging above a red-brick ground floor.

Harrow: Sudbury Hill Conservation Area Appraisal, adopted May 2008 (PDF) · Planning Data: Toll Gate Cottage, grade II, list entry 1358654 · Harrow: Roxeth Hill Conservation Area Appraisal, adopted May 2008 (PDF) · Planning Data: 60-66 Middle Road, grade II, list entry 1079671

In the Village, the 2008 appraisal says the residential buildings tend to have vertical emphases, shown in terraced rows with rhythmic patterns of openings, chimneystacks and rainwater goods. Linking that to plumbing is our advice, not the appraisal’s words: a new soil, waste or vent pipe is better kept off the front of such a terrace, where it would break into the rhythm of openings, stacks and rainwater goods that the appraisal describes.

Harrow: Harrow on the Hill Village Conservation Area Appraisal, adopted May 2008 (PDF)

Permissions and local rules

Consent, pipe routes and windows for a Hill bathroom

Inside a listed building

Does a bathroom in a listed building need consent?

It can. Under section 7 of the Planning (Listed Buildings and Conservation Areas) Act 1990, works to alter a listed building in any manner affecting its character as a building of special architectural or historic interest must be authorised. In the High Street groups, at Toll Gate Cottage or in 60–66 Middle Road, a survey of the existing room comes first: what the floor is made of, which walls are old, and whether any boarding, cornice or door is historic. Harrow can then say which proposed changes, including a new pipe through a wall, need consent.

legislation.gov.uk: Planning (Listed Buildings and Conservation Areas) Act 1990, section 7 · Harrow: listed buildings · Planning Data: 25A, 25B and 27-35 High Street, grade II, list entry 1358629 · Planning Data: 82-86 High Street, grade II, list entry 1272460 · Planning Data: Toll Gate Cottage, grade II, list entry 1358654 · Planning Data: 60-66 Middle Road, grade II, list entry 1079671

Drainpipes on the Mount Park Estate

Where should a new pipe run on a Mount Park house?

The Mount Park Estate’s 2008 strategy records badly sited drainpipes, aerials and satellite dishes as a pressure in various places across the area. It says drainpipes should run down existing projections of an elevation, so as to be as hidden as possible, or be sited on the least prominent wall, and the appraisal explains that badly sited drainpipes can spoil the appearance of attractive buildings that are otherwise well maintained. The strategy speaks of drainpipes; applying the same test to a new bathroom’s soil or waste pipe is our advice.

Harrow: Mount Park Estate Management Strategy, adopted May 2008 (PDF) · Harrow: Mount Park Estate Conservation Area Appraisal, adopted May 2008 (PDF)

A bathroom window on a side wall

What did officers recommend for a bathroom window in a side wall?

In one 2023 case at a house on South Hill Avenue, officers recommending permission for a single-storey rear extension treated a flank window serving a bathroom as serving a room that is not habitable, so it could be conditioned to be obscure glazed. The recommended condition required the windows in the extension’s flank elevation to be purpose-made obscure glass and permanently fixed shut below 1.7 m above finished floor level. It was one recommendation for one house, not a rule for every bathroom window.

Harrow: Planning and Developments, with the link to search Harrow’s planning register

Electrics in the room

When must the bathroom wiring be notified?

Under Approved Document P (2013 edition), wiring work in a home has to be notified if it adds a circuit, replaces the consumer unit, or adds to or alters circuits in a special location. In a room with a bath or shower, that location is the space round the bath tap or shower head, within set dimensions. For notifiable work, Harrow’s 2026 charges note accepts as competent an electrician registered with one of the competent person schemes it names, or with another scheme approved by the Secretary of State.

GOV.UK: Approved Document P, electrical safety in dwellings (2013 edition) · Harrow Building Control: domestic charges, Scheme No.15, Tables B and C, for applications from 6 April 2026 (PDF)

Working hours, skips, parking and the conservation area maps for the whole area are in our Harrow on the Hill guide. Local guidance checked ; requirements depend on the address, the building and the complete proposal.

What the work covers

The work inside a Hill bathroom renovation

Pipe routes settled first

The layout starts from the drains: where each waste can join the existing soil pipe, and whether any new pipe or vent would show outside. On a Village terrace or a Mount Park house, the aim is to keep new soil, waste and vent pipes inside the building or on its least visible wall. In a listed building, every new route through a wall or floor is drawn before Harrow is asked about consent.

Wastes to the foul drain, and the extract

Every waste goes to the foul drain, never to a rainwater downpipe or gully. Harrow’s leaflet on wrong connections explains that the surface water drain runs to the river untreated, and says such a connection is illegal and the owner’s responsibility to correct, even where someone else plumbed it in. Approved Document F (2021 edition) asks for an existing extract fan to be kept or replaced when a bathroom is refurbished, and the duct route is fixed before any tiling.

Harrow: leaflet, Is your home polluting Harrow’s rivers? (PDF) · GOV.UK: Approved Document F, Volume 1: Dwellings (2021 edition), ventilation

Water supply, floor and the room below

Harrow’s guidance note on the 2010 edition of Part G explains that wholesome water, or softened wholesome water, must reach every washbasin, bidet, fixed bath and shower in a bathroom. Its limit of 48°C on hot water to a bath applies only to new homes and to homes created through a material change of use, not to every refit. Joists under the bath or shower are checked, and the wet area is tanked and water-tested before tiles go down.

Harrow Building Control: guidance note on Approved Document G, 2010 edition (PDF)

How we work

How we run a Harrow on the Hill bathroom renovation

  1. Visit

    We see the room, trace where the stack runs, and check which floor it is on and what lies beneath.

  2. Survey

    The drainage falls, the extract route and the floor build-up at the door are measured before a layout is drawn.

  3. Design

    The layout, waterproofing and storage are drawn; where a floor or wall changes, our own architects and structural engineers design it.

  4. Price

    You receive a fixed written price once the design and fittings are agreed.

  5. Installation

    The dates, and any days without a working bathroom, are agreed before work starts.

  6. 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 Harrow on the Hill. Each card names where the work was done, so you can judge the finish and the approach before you brief your own.

Your brief

Before you ask for a quotation

  1. Find the list entry, if there is one

    Check the statutory list for your exact number, not just the street: on the High Street, entries cover particular runs such as 27–35 or 82–86. Tell us the entry, the conservation area and whether the house is on an Article 4 schedule, so that every consent is identified before design.

  2. Describe the room and where pipes run now

    Give the room’s floor level and size, what lies beneath and beside it, and where the soil pipe, waste pipes and any fan outlet run today, inside or down an outside wall. Photographs of the outside walls near the room help, because a new run may need to take a different route.

  3. Tell us about the people using it

    If someone in the household has a disability, or a level-access shower is the aim, mention it at the start. Harrow’s grant has its own assessment and contractors, and for council tenants the council arranges adaptations itself, so the route needs choosing before any design work.

Ready to take the next step? Send the address and a short outline of the work.

Book a free feasibility visit

Questions before you begin

Bathroom renovation in Harrow on the Hill: questions

Do you take on a standalone bathroom on the Hill?

Yes. A standalone bathroom renovation is welcome, whether it is a shower room in a Village cottage, an en-suite in a large Mount Park Estate house or the single bathroom in a flat in one of the Sudbury Hill blocks. Let us know if the building is listed, which room sits below and how the soil pipe runs, and the consents and checks are then worked out for that room alone.

Can Harrow help pay for an adapted bathroom?

Homeowners, private tenants and housing association tenants can apply for Harrow’s Disabled Facilities Grant, which can help with better access to a bathroom, toilet or wash area once an Occupational Therapist has assessed the person’s needs. The grant is valid only if the council’s approved contractors carry out all of the work. People who rent from the council use its Major Adaptations route instead, which typically includes level-access showers or wet rooms, funded and managed directly by the council.

Harrow: home adaptations grants and services (undated page, checked 16 October 2026)

How does Harrow Building Control charge for bathroom work?

Harrow’s current charging scheme, No.15, covers applications from 6 April 2026 and sets the charge for internal alterations and new fittings, electrical work aside, by the estimated cost of the job. No building regulation charge is payable where the work gives a disabled person facilities they can use in an existing home they live in, or will live in, as their permanent residence, because the existing ones could not be used by them, or only with assistance. Ask Harrow for the current figure when you apply.

Harrow Building Control: domestic charges, Scheme No.15, Tables B and C, for applications from 6 April 2026 (PDF)

Who deals with a blocked or leaking sewer?

Harrow’s flood page says Thames Water is the sewerage company for public sewers and waste pipes in the borough, and that sewer leaks, smells or full pipes go to Thames Water, not to the council’s online form. If opening up the bathroom floor reveals a waste pipe wrongly connected to a rainwater drain, Harrow’s leaflet says to put it right using a qualified plumber.

Harrow: flood reporting and advice (undated page, checked 16 October 2026) · Harrow: leaflet, Is your home polluting Harrow’s rivers? (PDF)

Does a new bathroom fan always need approval?

Not always. Under Approved Document F Volume 1 (2021 edition), swapping an extractor fan that runs on the existing cabling does not have to be notified to a building control body. A bathroom with no ventilation system can be refurbished without adding one, although extra ventilation may be needed where the work would leave the building less compliant with the ventilation requirements than it was before. Where a window is to be obscure glazed and fixed shut below 1.7 m, as in the South Hill Avenue case, plan the fan and its duct early.

GOV.UK: Approved Document F, Volume 1: Dwellings (2021 edition), ventilation · Harrow: Planning and Developments, with the link to search Harrow’s planning register

How much does a bathroom renovation cost in Harrow on the Hill?

A typical bathroom renovation in Harrow on the Hill 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 Harrow on the Hill bathroom

Tell us the address and what you want to change in your Harrow on the Hill bathroom. We reply within one working day, Monday to Friday, 8am to 6pm.

Or call 020 7101 3168. We serve Harrow on the Hill from our studio at Unit 3, Palace Court, 250 Finchley Road, London NW3 6DN.

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