Bathroom
renovation
in Harpenden, AL5
Designers, Architects, Engineers & Builders Under One Roof.
One Studio. One Contract. One Team.
A Harpenden bathroom is planned from the waste pipe outwards: where it can fall to the stack, where the extract can leave the house, and what the wiring around the bath has to meet.
Harpenden's housing largely dates from between the 1890s and the 1950s, from railway terraces to large houses of the Edwardian and inter-war years, and at that age an upstairs bathroom often sits over suspended timber floors. Where a new bath, shower or en suite can go then depends on the depth of the floor, the direction of the joists and the distance to a soil stack.
We look at those before the fittings. A beautiful layout that cannot drain is not a layout.
Which bathroom work needs approval in Harpenden
On the government's list of alterations that may require building regulations approval are putting in a bathroom that will involve plumbing and changing electrics near a bath or shower. Replacing baths, toilets, basins and sinks is exempt, and so is adding sockets and lights, or altering circuits, anywhere other than around baths and showers.
Exempt work still has to meet safety and energy efficiency standards. Where approval is needed it comes from the St Albans and Watford shared building control service or a private registered building control approver, and an installer registered with a competent person scheme can certify their own part instead.
Alterations confined to a building's interior fall outside the planning definition of development, so a bathroom seldom needs planning permission; where an outside change does, it goes to St Albans City and District Council. Our London team handles the rest: in-house designers draw the room, our structural engineers check any floor that must carry a cast bath or stone tray, and Hampstead Chartered Surveyors & Building Consultancy surveys the house first.
Sources: GOV.UK: Building regulations approval - when you need approval; GOV.UK: Building regulations approval (printable guide); St Albans City and District Council: Building control (web page); legislation.gov.uk (The National Archives): Town and Country Planning Act 1990, section 55 (meaning of development)
Wiring and extract in a Harpenden bathroom
Approved Document P makes any addition or alteration to circuits in a special location notifiable. In a room with a bath or shower, that is the space around the bath tap or shower head, up to 2.25 metres above the floor and 0.6 metres out from the edge of the bath or tray.
A note on the same document's diagram keeps socket-outlets at least 3m away from any bath tub or shower tray, which often decides where a shaver point or towel rail control can sit.
Approved Document F asks for extract ventilation to the outside in bathrooms, at a minimum intermittent rate of 15 litres per second, with the fan as high as is practicable in the room. When a bathroom is refurbished, any fan already there should be retained or replaced and checked to see that it works.
We place the fan where its duct has the shortest run to an outside wall or the roof, and the wiring zones are marked on the drawing before any tile layout is agreed.
Sources: GOV.UK: Approved Document P: Electrical safety - dwellings, 2013 edition; GOV.UK: Approved Document F, Volume 1: Dwellings, 2021 edition
Adding a bathroom or en suite upstairs in Harpenden
An upstairs bathroom lives or dies by its waste route. We trace where a new pipe can run down to the present soil stack, or to a new one, how deep the floor void is and whether joists would need notching, and only then fix the layout.
In joined houses, such as Luton Road's semi-detached pairs or Cornwall Road's terraced rows, a pipe or duct chased into the party wall means notifying the neighbour first, whereas plastering, fresh wiring or extra sockets need no notice.
If drainage outside the house changes as well, the Harpenden Neighbourhood Plan asks for an integrated approach to surface water and foul drainage, and says no surface water may enter the public foul sewer.
The plan also asks every development to follow best practice in water efficiency, naming water efficient fittings and appliances, which bears directly on the choice of taps, showers and WCs.
Sources: St Albans City and District Council: Conservation Area Character Statement for Harpenden (April 2008); GOV.UK: Party walls and building work - work you must tell your neighbour about; Harpenden Town Council and Harpenden Rural Parish Council (published by St Albans City and District Council): Harpenden Neighbourhood Plan, version for referendum November 2018, made
Renovating a Harpenden bathroom
We take on one bathroom as readily as several. The survey covers the floor, the stack, the hot water supply and the ceiling below, because a past leak or a weakened joist is far easier to deal with before the tiles go down.
Strip-out, first-fix plumbing and wiring, any building control inspection, then tanking, tiling and second fix: the order goes into the written scope, which shows you when the room will be out of use.
If a new boiler or heating system comes with the bathroom, installing or replacing a heating system is itself work that can need approval, and we include it in the same building control route.
Outside Harpenden, and in London rather than Hertfordshire: Project example: Maida Vale, W9. That project of ours was a whole-house refurbishment of a Victorian townhouse; its case study records bathrooms installed within that same refurbishment, the services to them routed in the renewal.
Sources: GOV.UK: Building regulations approval (printable guide); Hampstead Renovations: Victorian Townhouse, Maida Vale W9 case study
Bathroom Renovation in Harpenden: Questions
Which bathroom works in Harpenden need building regulations approval?
Installing a bathroom that involves plumbing, and changing electrics near a bath or shower, can need approval; replacing baths, toilets, basins and sinks is exempt. Approval comes from the St Albans and Watford shared building control service unless you hire a private registered building control approver to do it; a scheme-registered installer can certify their own part of the work.
Can an extra bathroom or en suite go on an upper floor of a Harpenden house?
Usually, as long as the waste pipe can fall to a soil stack at a workable gradient and the floor can carry the load. We trace the pipe route, check the joists and the space for an extract duct, and confirm that any outside change, such as an added external pipe or vent on a house in the conservation area, has the permission it needs.
Which extract and wiring rules govern a bathroom renovation?
Approved Document F asks for extract ventilation to the outside, with a minimum intermittent rate of 15 litres per second for a bathroom. Under Approved Document P, altering circuits in the zone round a bath or shower is notifiable work, and a note on its diagram keeps socket-outlets 3m or more from the bath tub or shower tray.
Do you take on a single bathroom in Harpenden?
Yes. Our London team plans a single bathroom with the same survey, drainage design and wiring zones as a larger job, and Hampstead Chartered Surveyors & Building Consultancy can survey the rest of the house at the same visit if more work may follow.
How is a Harpenden bathroom renovation scoped and priced?
We list each stage, from strip-out and first fix through any building control inspection to tanking, tiling and fittings, with the waste route and extract shown on a drawing. The price is built from that written scope rather than from a standard allowance.
What do you check at a feasibility visit for a Harpenden bathroom?
The line of the soil stack and the drains, the condition of the floorboards and joists and the ceiling underneath, the hot water and heating arrangement, and the best exit for an extract duct. If the room needs a new outside pipe or vent, we also check on the council's mapping whether the house is in the conservation area.
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