House
extensions
in Bloomsbury, WC1
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Hampstead Chartered Surveyors & Building ConsultancyIn Bloomsbury the backs of the terraces matter as much as the fronts: Camden's appraisal says rear extensions will not be acceptable where they would compromise the historic pattern of rear elevations. We design an extension from that pattern outwards.
Bloomsbury is the great planned Georgian quarter of London, and extending a house here works within the Bloomsbury Conservation Area and largely on the Bedford Estate. Camden scrutinises external change closely and applies Article 4 controls, and the listed terraces demand careful structural and party-wall sequencing before a rear addition can proceed.
The buildings set the discipline. Bedford Square is among the most complete Georgian squares in the country; Russell Square and Gordon Square carry the Bloomsbury Group terraces; and Mecklenburgh Square and the surrounding blocks add mansion flats and academic conversions. Any new addition is designed to stay subordinate to WC1's historic elevations.
Costs are driven by restricted access, party-wall awards, structural openings in older terrace fabric, drainage, and light and overlooking constraints, whether for a single-storey rear extension or a side return.
Extending a Bloomsbury house: the rear elevation comes first
Camden's appraisal treats the original pattern of rear elevations within a street or group as integral to the area's character, and states that rear extensions will not be acceptable where they would compromise it. The first design question is therefore what the backs of the neighbouring houses still look like, not how much floor area can be gained.
Many terraces back onto mews built to stable horses and carriages and to house coachmen, and the appraisal notes that these mews gave rear service access to the larger houses on the principal streets and squares. An addition is seen from the mews as well as from the neighbouring gardens, so its height and materials are judged from both sides.
These terraces were built to rules. On Gower Street the uniform elevations came from the Bedford Estate's contractual controls over dimensions, materials and surfacing, and Bedford Square was built in 1775-6 as one composition with strict control of its elevations. An extension that respects that discipline uses the brick, bond and window proportions of the original back wall.
Camden expects the Design and Access Statement with an application to address what the appraisal identifies: the formality and regularity of terraced forms and the scale, mass, form and rhythm of the historic pattern. We write that statement from a survey of the actual terrace rather than from a standard text.
Gardens matter here as well as walls. The appraisal notes that conservation area designation brings greater control over the removal of trees, so a rear extension is planned around the trees in your garden and your neighbours' gardens, with any work to them notified to Camden in advance.
Some terraces were designed as single compositions to give a grander, palatial scale, such as the east side of Mecklenburgh Square. Behind houses like those, an addition that breaks the symmetry of the group is harder to justify than in a street of plainer houses.
The brick of the rear wall tells you what to match: the appraisal notes that red brick appears in earlier Georgian building, while London stock was used from about 1800. A new rear wall in the right brick, laid in the right bond with lime mortar, reads as part of the house rather than a patch on it.
Before the design is fixed we assess how much daylight and sunlight the neighbours' rear rooms receive now and would receive with the extension, because in a tight Bloomsbury terrace that often decides its height.
A related project, not in Bloomsbury, is Fitzjohns Avenue, NW3: a new basement and a rear extension at a house in NW3.
Party wall notices, the condition of the garden walls and the route for materials, through the house or from the mews, are settled before the design is priced, because a Georgian terrace rarely offers any other way in.
House Extensions in Bloomsbury: Questions
Can I add a rear extension to a listed Bloomsbury terrace?
Possibly, but it needs listed building consent as well as planning permission, and Camden protects every part of a listed building, including later additions. Long runs of Bloomsbury are listed, such as the grade II terraced houses on the west side of Gower Street, so we read the list entry and the rear pattern of the group before proposing a size.
Is Bloomsbury in a conservation area?
Yes. Bloomsbury sits within the Bloomsbury Conservation Area and largely on the Bedford Estate; Camden scrutinises external change closely and applies Article 4 controls, and the listed terraces demand careful structural and party-wall sequencing.
How are extensions handled on Bloomsbury's listed terraces?
Carefully and subordinately. New rear additions are kept subordinate to WC1's historic elevations, with party-wall awards, structural openings in older terrace fabric, drainage and overlooking all managed through the design and build.
What does a house extension cost in Bloomsbury?
In Camden a single-storey rear extension, a side return and a wraparound are each quoted after a feasibility visit.
How is a kitchen extension in Bloomsbury costed?
The build cost is priced on the new floor area, with a kitchen supply allowance on top. Scope and specification then set the scheme figure.
Which Bloomsbury streets suit extensions?
Bedford Square is among the most complete Georgian squares in the country; Russell Square and Gordon Square carry the Bloomsbury Group terraces; and Mecklenburgh Square and the surrounding blocks add mansion flats and academic conversions.
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