House Extensions in Holland Park
For a Holland Park extension, compare the proposed footprint and openings with the actual boundaries and retained rooms. Address-specific heritage controls and access for building work need resolving before the kitchen or living-space design is committed.
Rear and side extensions to Holland Park villas
Rear elevations in Holland Park were designed to match their neighbours, the appraisal says, and their closet wings, chimneys, stock brick, timber sashes and brick lintels all form part of the conservation area's character.
Closet wings never rise to full height here: they stop a storey below the eaves on Holland Park Avenue and at first floor on Holland Road, and the solid and void rhythm they create is an important feature.
On Upper and Lower Addison Gardens the closet wings were infilled at ground floor with a brick structure topped by a stucco bottle balustrade, an infill design particular to those streets.
Francis Radford's Holland Park houses have the grandest rears, mostly fully stuccoed with canted bays, particularly where they face the park, while the Melbury Road houses each have an individually designed rear elevation.
Side extensions are the sensitive case. Many detached houses have had them built in the gaps between, which the appraisal says harms their open setting, and on Addison Road the space beside each villa and the large garden behind are part of that setting.
Policy CD13 resists an extension beyond the general rear building line of neighbouring extensions, above their general height, or up to the original main eaves or parapet.
The appraisal also lists oversized extensions, painted or rendered brick and moved windows among the things that detract from rear elevations, and notes that brickwork was always left fair-faced.
Short views across garden walls reveal rear elevations and back-garden greenery in many places, the appraisal notes, and green space, from the park itself to the large gardens around the detached houses, is a key feature of the area.
Detached houses on Holland Park and the linked villa pairs around Holland Park Gardens and the Avenue take their character from very small gaps, so even a narrow side addition can close the space that defines them.
On the Ilchester Estate the estate's written consent is needed for any external alteration, an extension included, on top of planning permission or listed building consent.
Insulation and new glazing that come with an extension are tested under Policy GB1, which asks that retrofit does not harm a house's special interest or the conservation area. A heat pump or air conditioning unit in the new space is weighed for noise under Policy GB8, and the Local Plan asks owners to consider passive cooling first.
The house types here are mostly large detached Victorian villas and detached artists' studios; terraces and linked villa pairs are a small share, confined to the edges of the estate and later development, so most extensions here are to a free-standing house seen from several sides.
On site, deliveries keep to 9.30am to 4.30pm on weekdays and footways stay at least 1.2 metres clear unless a closure has been agreed, under the borough's Code.
Outline applications are not enough in a conservation area; the Local Plan asks for fully detailed drawings, which is why the extension's brick, joinery and roof are settled before submission.
Numbers 50 to 59 Addison Road, first called Abbotsford Villas, were built as linked pairs by John Parkinson junior between 1852 and 1855, and the appraisal finds that some have oversized rear extensions rising above the linked sections, spoiling the pair.
On Holland Villas Road the houses have a distinctive central closet wing with a gabled roof at the back, which a new rear addition has to leave legible.
Not in Holland Park, but the same kind of work: Fitzjohns Avenue, NW3, a rear extension built together with a new basement.
We draw the neighbouring rears and closet wings into the survey, so the proposal is designed against the actual line of the group rather than the single house.
Sources: Royal Borough of Kensington and Chelsea: Holland Park Conservation Area Appraisal (June 2017); Royal Borough of Kensington and Chelsea: Holland Park Conservation Area Appraisal (adopted June 2017); Royal Borough of Kensington and Chelsea: Local Plan (adopted July 2024); Royal Borough of Kensington and Chelsea: Code of Construction Practice (April 2019).
House Extensions in Holland Park: Questions
Do I need the council's permission for a small rear extension in Holland Park?
Often, because stricter controls apply in conservation areas than elsewhere, even though houses keep some permitted development rights. Living in a conservation area does not prevent change; it means the design is judged against the area.
Which Construction Code category is a house extension?
Category 2 for residential extensions, which still means the Code checklist and a site construction management plan approved by the council before work starts.
Is extending an artists' studio-house treated differently?
Yes. Melbury Road and Holland Park Road hold one of the borough's important concentrations of studio-houses, and Policy CD1 resists inappropriate alterations and extensions to artists' studios.
Do the closet wings limit an extension?
They set its scale. Paired closet wings here stop a storey below the eaves on Holland Park Avenue and at first floor on Holland Road, and the appraisal values the solid and void rhythm they make along a terrace.
How far back can a Holland Park rear extension go?
Policy CD13 is the measure: no further than the general rear building line of neighbouring extensions, and no higher than their general height or the original main eaves or parapet.
Can I build a side extension between two detached Holland Park houses?
It is the hardest case. The appraisal says side extensions built between detached houses have harmed their open setting, and it describes the space beside each Addison Road villa as an essential part of its setting.
Book a feasibility visit
Request a visit
Relevant work elsewhere in London
These published examples show the stated service in their named locations. They are not presented as completed projects in Holland Park or Notting Hill.
