House Refurbishment Harrow

House refurbishment in Harrow is often a job on an interwar house. The VOA puts 52% of the borough's homes in the years 1919 to 1939, and 62% of all homes are houses, from mock-Tudor semis and 1930s suburban houses to large detached homes. We renew the wiring, pipework and heating, repair plaster, floors, joinery and roofs, and decorate, without re-planning the layout. The street licences, the working hours and any conservation controls are built into the programme from the first visit.

For Harrow, published UK figures put a three-bed house refurbishment at £43,530 to £110,350, and London houses usually cost more, with a London architect allowing £1,800 to £2,200 per square metre before VAT (Checkatrade and Bradley Van Der Straeten Architects, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Harrow: we renew the wiring, pipework, heating, plaster, floors and joinery of the whole house under one contract, and a registered electrician certifies the rewire.

What an interwar Harrow semi needs renewed in a refurbishment

A Harrow semi of this age usually needs its services renewed more than its structure. 39% of the borough's homes are semi-detached or detached, 21% are terraced, and 52% of all homes date from 1919 to 1939. Houses of that period were built with brick walls, suspended timber ground floors, lime or early gypsum plaster and clay tiled hipped roofs. After ninety years or more, the parts that have worn out are the ones hidden in the floors and walls: rubber or early PVC cable, lead or iron supply pipes, and radiators on narrow pipework that no longer balance.

Our survey lifts a few boards, opens the consumer unit and checks the loft before any price is fixed. That tells us whether a full rewire and replumb is needed or whether circuits can be extended, and whether the heating wants a new boiler, new pipework or both. Timber floors get their joist ends and air bricks checked while they are open. The roof, gutters and chimney stack are looked at from a scaffold only if the survey shows a problem, so you are not paying for access you do not need.

Housing in Harrow

Harrow has around 96,870 homes on the Council Tax list: 38% post-war, 52% interwar and 10% predate 1919, with 38% flats and 62% houses. 31% of homes here are semi-detached; a semi in Harrow has a single party wall, so one neighbour hears the chasing.

Doors, windows and roofs on Harrow houses under Article 4

Before windows, doors or roof tiles on a Harrow house are replaced, check whether the street is in one of the borough's 30 Conservation Areas. Harrow's Conservation Areas Residential Planning Guidelines say Article 4 Directions can mean planning permission is needed to replace doors and windows, for any hardsurfacing, and for boundary walls and fences. A like-for-like sash repair is a different matter from a new frame, so the choice between repair and renewal can decide whether an application is needed at all. A listed house also needs listed building consent, which covers works inside as well as out.

Roofs have their own controls in parts of Pinner. An Article 4 direction for all houses in West Towers Conservation Area requires planning permission for any other alteration to the roof, such as rooflights or new roof tiles. In the Pinnerwood Park Estate Conservation Area core area, roof alterations such as rooflights need permission too. The owner or their agent secures any consent, and we order joinery and tiles only once the approved details are known, because made-to-order joinery cannot be sent back.

Working hours, skips and scaffolds for a Harrow house on a street

In Harrow, noisy construction work is permitted Monday to Friday 8am to 6pm and Saturday 8am to 1pm, with none on Sundays or bank holidays. For a house refurbishment that shapes the week. Hacking off plaster, lifting floors and chasing walls for cables go into the weekday slots, while measuring, snagging and quiet second fix can sit on a Saturday afternoon. If you are living in the house during the works, those hours also tell you when the dust and noise will be at their worst.

Where a Harrow house has a front drive, a skip placed on it needs no licence. A skip on the road does, and a Harrow skip licence runs for 14 days, with a further fee for each extra two weeks. Where a front roof or chimney needs a scaffold on the pavement, the scaffolding licence is charged for the first month, so the scaffold goes up when the roofer is ready and comes down when the gutters are done. A chimney stack shared with next door is a party structure: the owner serves notice, and the repair waits for written consent or an award. Parking bay suspensions can take up to ten working days to arrange.

Living in the Harrow house or refurbishing it empty

Whether you stay in the Harrow house during the works changes the order of everything. In an empty house we strip out all rooms at once, run the whole first fix of electrics and plumbing in one pass, plaster through, then second fix and decorate. That is the shortest programme. Executors preparing a probate sale, buyers who have not yet moved in and landlords re-letting a whole house usually choose this route, because nobody needs a working kitchen or bathroom during the job.

If you live in the house, we phase it. One floor or a few rooms are stripped and finished while you use the rest, and a temporary kitchen and a working bathroom stay in place until their turn. It takes longer and needs more dust protection, but it saves rent elsewhere. Either way, where Harrow Building Control handles the application, its site visits for work such as a structural repair or a re-roof run on weekdays between 10 in the morning and 3 in the afternoon. We book those visits into the phase plan.

• Consumer unit replacement, with earthing and bonding brought up to standard
• Loft insulation topped up while the tank space is cleared
• Whole-house rewires, certified at completion by a registered electrician

VOA Council Tax stock of properties, March 2025, for all 30 statistical areas in Harrow. Counts rounded by the VOA.

For the wider picture around house refurbishment in Harrow, see home renovation in Harrow, our Harrow area guide, builders in London for house refurbishment, a snagging list before a refurbished house is handed back, our London house refurbishment page and Chimney Stack Repair.

Why Harrow Homeowners Choose GS Renovation

A house refurbishment has many trades and one order: strip out, first fix, plaster, second fix, finish. We write the scope room by room after a survey of the house, so you see what is repair, what is renewal and what is decoration. One site lead runs the trades, the skip and scaffold licences and the neighbours. A registered electrician certifies the new wiring, an engineer on the Gas Safe Register does any gas work, and you get every certificate at handover.

• Fully insured, with cover in place on every site
• Damp traced to its source before anyone suggests an injected course
• Empty and inherited houses secured and reported on while you are away

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254).