Skip to main content

Pinner HA5 · Bathroom renovation

Bathroom renovation in Pinner

Timber-framed cottages, garden-suburb semis and pipes on show

A Pinner bathroom might go into a listed timber-framed cottage, an inter-war house on a garden-suburb estate or a flat above a High Street shop. This page sets out what Harrow’s records say about those listed interiors, the pipes and flues on the outside of the buildings and the drains beneath them, and how adaptation help and approvals work when a bathroom is renewed.

Book a free feasibility visitSee typical costs

Serving Pinner from our Hampstead studio · NW3 6DN
020 7101 3168

Start here

Bathroom renovation in Pinner at a glance

Two questions come before any fitting is chosen for a Pinner bathroom: is the building listed, and will a new pipe, vent or flue show outside? Listed timber-framed buildings stand in the Waxwell Lane, Tookes Green and East End Farm conservation areas, and inside a listed building, work that affects its special interest needs consent. Outside, the design guide for the Pinnerwood Park Estate conservation area, which Harrow lists with Pinner, asks for exterior pipes to be kept to a minimum, and the High Street strategy insists on good design at the rear whenever permission is sought, even where little seen.

Harrow: Waxwell Lane Conservation Area Appraisal and Management Strategy, adopted December 2009 (PDF) · Harrow: Tookes Green Conservation Area Appraisal and Management Strategy, adopted December 2009 (PDF) · Harrow: East End Farm Conservation Area Appraisal and Management Strategy, adopted December 2009 (PDF) · Harrow: listed buildings · Harrow: Pinnerwood Park Estate Conservation Area Appraisal and Management Strategy, adopted December 2009 (PDF) · Harrow: Pinner High Street Conservation Area Appraisal and Management Strategy, adopted December 2009 (PDF)

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

Approved guide prices

What does a bathroom renovation cost in Pinner?

A typical bathroom renovation in Pinner 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 timber frames in Pinner’s older lanes

Three appraisals adopted in December 2009 describe listed timber-framed buildings in three of Pinner’s conservation areas. Where a bathroom is planned in one, the frame and the historic rooms around it are understood before the layout is drawn.

East End Farm Cottage, formerly East End Farmhouse, is listed grade II*. The East End Farm appraisal describes it as an early fifteenth-century timber-framed hall house and says its high grade rests on what survives inside: the screens passage, an extremely rare smoke bay and a fine seventeenth-century wall painting on the ground floor. In a listed building, internal works that affect its special interest need listed building consent, so in a building like this, pipe runs, ventilation and new floors are settled with Harrow before any design is fixed.

Planning Data: East End Farm Cottage, grade II*, list entry 1358620 · Harrow: East End Farm Conservation Area Appraisal and Management Strategy, adopted December 2009 (PDF) · Harrow: listed buildings

The Waxwell Lane appraisal names Manor Cottage and Manor House among its conservation area’s listed buildings, and the national list records them in one grade II entry, ‘Manor Cottage Manor House Waxwell Cottage’. The appraisal describes the area’s sixteenth- and seventeenth-century timber-framed cottages, and notes that beneath the later half-timbering of Manor Cottage and Waxwell Cottage are the remains of a medieval hall house. For repairs to a listed building, Harrow expects natural materials, such as lime mortar for repointing joints.

Harrow: Waxwell Lane Conservation Area Appraisal and Management Strategy, adopted December 2009 (PDF) · Planning Data (Historic England): Manor Cottage Manor House Waxwell Cottage, grade II, list entry 1079659 · Harrow: listed buildings

In the Tookes Green conservation area, the appraisal names The Bay House and The Grange Cottage among the listed buildings and calls them the area’s two timber-framed properties. The Bay House, built around the middle of the seventeenth century, probably for letting, is partly timber framed behind a symmetrical brick façade. Grange Cottage is timber framed, although much of the framing seen on the outside is later mock timber framing with painted brick infill panels.

Harrow: Tookes Green Conservation Area Appraisal and Management Strategy, adopted December 2009 (PDF)

Permissions and local rules

Pipes, flues and garden buildings: Pinner’s local guidance

Exterior pipes in Pinnerwood Park

What does the estate’s design guide say about pipes and gutters?

The design guide in the 2009 appraisal for the Pinnerwood Park Estate conservation area, which Harrow lists with Pinner, says a proliferation of exterior pipes can detract from a building’s appearance and should be kept to a minimum. Attractive original details such as hopperheads should be kept or, if necessary, replicated, and guttering should be half-round and black, in materials matching the original style. This is design guidance, not an Article 4 control, and it does not mention bathrooms; check the address and the estate’s direction note before a new pipe is placed outside.

Harrow: Pinnerwood Park Estate Conservation Area Appraisal and Management Strategy, adopted December 2009 (PDF) · Harrow: Pinnerwood Park Estate Conservation Area Article 4 directions, guidance note for residents (PDF)

Behind the High Street

What does the High Street strategy expect at the rear?

The 2009 management strategy for the Pinner High Street conservation area says that whenever planning permission is sought at the rear of the High Street, every opportunity should be taken to improve its service areas, including insisting on good design for new external flues and small additions even where they would not be seen from many places. It does not mention bathrooms. Among the High Street’s listed buildings are 18–24 High Street and 34, 34A and 36 High Street, both grade II; the records do not say whether either has homes above its shops.

Harrow: Pinner High Street Conservation Area Appraisal and Management Strategy, adopted December 2009 (PDF) · Planning Data (Historic England): 18–24 High Street, Pinner, grade II, list entry 1079703 · Planning Data (Historic England): 34, 34A and 36 High Street, Pinner, grade II, list entry 1358634

A toilet in a garden building

Can an outbuilding have a WC?

One 2025 case shows how officers approached it. For a semi-detached house in the Pinnerwood Park Estate conservation area, which Harrow lists with Pinner, they recommended granting planning permission for a single-storey garden outbuilding for storage and office space, with toilet facilities ancillary to the house. Their report explained that one test of whether a use is incidental to the house is self-contained facilities, normally shown by cooking or bathroom facilities, and the recommended condition allowed only incidental uses, never primary living accommodation. It was one recommendation for one site, not a rule.

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

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

What the work covers

The parts of a Pinner bathroom renovation

Wastes, soil pipe and the drain they join

Every waste is followed to the drain it joins before the room is closed up. Harrow’s leaflet on misconnected drains says waste from a toilet, shower, bath or basin must never run into a downpipe carrying roof water or into a gully, since that drain reaches the local river untreated, and that an owner must put right a wrong connection even where someone else made it. Older drains are checked by camera before new runs join them.

Harrow: leaflet, Is your home polluting Harrow’s rivers? (PDF)

Hot water at the tap

The bath and shower controls are chosen with the hot water system, so the temperature at the outlet is set, not left to the boiler. Harrow still links its guidance note on the 2010 edition of Approved Document G, which said hot water delivered to a fixed bath must not exceed 48°C, but only where a dwelling is built or formed by a material change of use. That is Harrow’s 2010 explanation, not the current regulations.

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

Fan, duct and outlet

If the room already has an extract fan, the refit keeps or replaces it, as Approved Document F expects when a bathroom is refurbished. Where the original room had no ventilation system, the new one does not have to gain one, though additional ventilation may be necessary if the work is likely to make the house less compliant than before. The duct is drawn to a rear wall or through the roof space where the structure allows, so no new grille appears on the street front.

GOV.UK: Approved Document F, Volume 1: Dwellings (2021 edition), ventilation

How we work

How we run a Pinner 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 Pinner. 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. Say where the room sits

    Give the floor the bathroom is on and what lies directly below and beside it: another room, a neighbour’s flat or a shop. Say whether the building is timber framed, an inter-war house or a 1930s block, and, if you know it, the route of the soil pipe on the outside wall.

  2. Check the building’s status

    Look up the building’s list entry, if it has one, and the conservation area Harrow’s map shows at the address, for example Waxwell Lane, Tookes Green, East End Farm, Pinnerwood Park Estate or Pinner High Street. For a flat, name the freeholder and tell us if it is Harrow Council.

  3. Photograph the outside walls

    Photograph each wall the bathroom touches from outside, showing every pipe, gutter, hopperhead, vent and flue, and note which still serve a fitting. That record shows where a new waste or extract could leave the building with the least new pipework on view.

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 Pinner: questions

Can I have just one bathroom renovated in Pinner, on its own?

Yes. A standalone bathroom renovation is welcome here, from an en-suite in a detached Pinner Hill house to the family bathroom of a Pinnerwood Park semi or the only bathroom of a flat above a shop. Tell us what lies beneath the room, whether the building is listed and where its waste leaves the building, because those answers shape the consents and checks that come first.

Who pays for a bathroom adapted for a disabled person?

That depends on your tenure. For Harrow Council tenants, Major Adaptations, which typically include level-access showers or wet rooms, are funded and managed directly by the council. Homeowners, private tenants and housing association tenants may be able to apply for a Disabled Facilities Grant instead, which begins with an Occupational Therapist’s assessment, and Harrow says the works must be carried out by its approved contractors for the grant to be valid. Settle which route applies before a design is drawn.

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

Which electrical work in a bathroom must be notified?

Three kinds of electrical work in a home are notifiable under Approved Document P: a new circuit, a replacement consumer unit, and any addition or alteration to circuits in a special location, a term that covers the space round a bath tap or shower head. Harrow’s building control charges for applications from 6 April 2026 assume such work is certified by a Part P registered electrician through a competent person scheme, with a supplementary charge where that is not so.

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)

Who deals with a sewer problem found during the work?

Harrow says the local sewerage company looks after public sewers and waste pipes, and that in Harrow this is Thames Water. Report a leaking, smelly or full sewer to Thames Water directly; Harrow asks that its own flood form is not used for these. If opening up the floor or the drive shows a problem with a public sewer, keep the work clear of it until Thames Water has given its answer.

Harrow: flood reporting and advice (undated page, checked 16 October 2026)

What changes when the bathroom is in a flat above a shop?

The business below shares the risk of any leak, and its ceiling may carry your waste pipes. Agree with the freeholder how the shop will be told, when its ceiling can be opened and how the new floor will be lined and water-tested before tiling. If the flat is in one of the High Street’s listed buildings, ask Harrow first whether the work affects the building’s special interest.

Harrow: listed buildings

How much does a bathroom renovation cost in Pinner?

A typical bathroom renovation in Pinner 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 Pinner bathroom

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

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

Use the full contact form instead

Keep exploring

More for your Pinner project

Bathroom renovation in nearby areas

Chat with us!