Builders and plumbers in Woodside Park, N12

The first fork in any Woodside Park approval route is whether the property is a house or a flat. Householder permitted development rights attach to houses. Flats and maisonettes do not share them, so most external alterations to a flat need a planning application. A house converted into flats is treated as flats for this purpose, even where it still looks like a single home from the street.

For a house, the next question is whether those rights survive at the address. They can be withdrawn by an Article 4 direction, restricted by a condition on an earlier permission, or narrowed by conservation area status. We read the planning history before assuming any project is permitted development. Where the answer matters to a lender, buyer or neighbour, a lawful development certificate from the council puts it in writing. For a flat, the lease and the freeholder’s consent run alongside whichever planning route applies.

Barnet publishes its conservation area appraisals and boundary maps as open data. None of the conservation areas in that list is named Woodside Park. That is useful, but it only rules out a designation carrying the district’s name. A conservation area named after somewhere else can still reach a street, so the boundary map, not the name, is checked for the exact address.

The result changes the approval route in specific ways. Inside a conservation area, cladding, roof enlargements and side extensions fall outside householder permitted development, and knocking down an unlisted building may need planning permission. Most tree work there also needs prior written notice to the council. Outside one, those extra controls fall away, although listing, Article 4 directions and tree preservation orders can still apply independently. Each check is recorded separately in the file, so a later buyer can see what was confirmed.

Historic England’s list includes two Grade II entries at Finchley Catholic High School, both first listed on 25 March 1976. The lodge on Woodside Grange Road is a two-bay rusticated stucco building of two storeys. Its entry notes a machicolated parapet and lancet windows with hood moulds. The White House, also part of the school, is dated to about 1820 and described as a two-storey battlemented stucco house of five windows.

Work to either building would need listed building consent where it affects their character, and that consent sits apart from planning permission. The setting of a listed building can be a material consideration when a nearby extension, boundary or outbuilding needs planning permission. So a householder application close to a listed building may be assessed on more than its own plot. We search the National Heritage List for the exact address and its neighbours before drawings are prepared.

Permitted development is not a single allowance. Each class, such as rear extensions, loft conversions or outbuildings, has its own limits on size, height, position and materials. Several also carry conditions, such as using materials of similar appearance to the existing house. A larger single-storey rear extension can go through a prior approval process, in which the council consults neighbours before deciding. A proposal that misses one limit by a small margin is not permitted development at all.

We measure the house and plot before any class is relied on, including earlier extensions that count against the allowances. Where the design sits close to a limit, we recommend a lawful development certificate before building starts. It also gives a clear record for a future sale. If the scheme falls outside permitted development, a householder planning application is prepared instead. Either way, Building Regulations approval is still needed for most structural work.

Barnet publishes its tree preservation order schedule items as open data, with the protected areas drawn as polygons. That gives a first check on whether a tree in or beside a garden is protected. Any doubt is resolved with the council before work is planned. The council’s consent is needed before a protected tree is cut down, topped, lopped or uprooted. Damage to its roots can also breach an order.

Trees affect building design as well as consent. An extension footprint, a new drain run or a garden room slab can each disturb roots within a tree’s root protection area. Where soils shrink and swell, nearby trees can also influence foundation depth, which building control will review. We place the tree check before the drawings, so the footprint is set around what can lawfully and safely stay. Protective fencing and any hand-dug sections are written into the scope.

The government’s long-term flood risk checker reports on four sources: rivers and sea, surface water, reservoirs and, where data exists, groundwater. Results are given for a location, so two houses in the same road can return different answers. We look up the exact address before settling floor levels, a basement, a sunken terrace or a larger area of hard landscaping.

Where a result shows some risk, the design responds rather than stops. Thresholds can be raised, paving made permeable and rainwater held back before it leaves the plot. Where a new extension will sit over or beside an existing drain, the drain is surveyed and its ownership confirmed. A public or shared sewer may need the water company’s agreement before anything is built over it. Any change to how surface water leaves the garden is designed so that it does not shift onto a neighbour.

Planning permission, or confirmation that none is needed, does not approve the construction itself. Building Regulations approval covers structure, fire safety, drainage, insulation and ventilation, and is obtained through a building control body. Inspections take place at set stages, such as foundations and drainage, and a completion certificate is issued at the end. We choose the building control route while the drawings are being prepared.

The Party Wall etc. Act runs on its own track again. Notice must be served on the adjoining owner before work to a shared wall. The same applies to building on the boundary line and to excavation close to a neighbouring foundation. The neighbour can consent or dissent. A dissent leads to the appointment of surveyors and an award setting out how the work proceeds. We serve notices early enough that the award is in place before the relevant work is reached.

The approvals are placed in order before anything is priced. First come the measured survey, planning history, designation, listing and tree checks. Then the planning route is settled, whether permitted development with a certificate, prior approval or a householder application. Building Regulations drawings follow, then party wall notices and, for a flat, the freeholder’s licence. Each step is recorded with its outcome, so the written scope reflects consents actually held rather than consents expected.

The work is then carried out in-house by Hampstead Renovations or Hampstead Maintenance, according to what the scope covers. Any parking controls near Woodside Park Underground station, which TfL lists on the Northern line, are confirmed for the exact address rather than assumed. Whether the road outside is a borough road or part of TfL’s network is checked on the same visit. At handover the file holds each decision, certificate and award in the order they were obtained.