Wraparound Extension Drawings in Edgware HA8
Fixed-fee, MCIAT-chartered wraparound extension drawings for Edgware (HA8) homeowners — London Borough of Barnet validation and local constraints handled from the start.
Edgware (HA8) is a planned interwar Metro-land suburb of consistent semis and terraces, including the distinctive 1920s LCC cottage housing of the Watling Estate. Deep gardens and standard hipped-roof forms make rear extensions, hip-to-gable lofts and rear dormers the usual work, most of it within Barnet's householder framework along the historic Edgware Road corridor.
The Watling Estate and Canons Park Estate conservation areas protect the neighbourhood's planned uniformity, controlling frontages, materials and roofscape more tightly than in a typical speculative street. We design extensions that hold the estate's building line, render and hipped-roof rhythm, and prepare conservation-grade drawings where needed so schemes meet Barnet Council's approval standard.
Planning in Edgware (HA8): what to know before you apply
No published householder Article 4 direction in Edgware, so most work runs under permitted development or a standard Barnet application. Properties within the Watling Estate or Canons Park Estate conservation areas have reduced permitted-development rights and tighter control on frontages, materials and roof alterations to preserve the planned interwar character.
Typical Edgware housing stock
Edgware (HA8) is a quintessential Metro-land suburb of 1920s-30s semis and short terraces, from speculative bay-fronted pairs to the planned 1920s LCC cottage houses of the Watling Estate. Consistent hipped roofs, rendered gables and long rear gardens make loft dormers and rear extensions the typical projects.
Streets we regularly draw for in Edgware
Edgwarebury Lane · Hale Drive · Sefton Avenue · Orange Hill Road
What HA8 is actually built of
Measured from 439 classified residential buildings in HA8, not from a description of the area.
Edgware HA8 housing mix
Residential building form across the HA8 postcode district, from 439 classified buildings.
| Attached on more than one side | 42% |
|---|---|
| Attached on one side | 52% |
| Detached | 5% |
| Median building footprint | 58 m² |
| Addresses per buildingAbove about 2 means flats and maisonettes dominate | 1.41 |
| Buildings classified | 439 |
Source: Ordnance Survey National Geographic Database (derived statistics). Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Extracted 2026-08-17.
Wraparound Extension Drawings for Edgware (HA8) homes: the package and the process
A wraparound is assessed as one addition, so the drawings have to present it as one: a single proposed footprint with the rear depth and the side width both dimensioned, the roof drawn as it turns the corner, and the remaining garden shown on the site plan.
The corner is where the technical work sits. Two roof planes and two structural spans meet at the return, drainage has to get round it, and the internal opening is usually wide enough to need a designed frame rather than a single beam. We resolve that junction on the drawings before it becomes a question on site.
A wraparound needs both a rear garden and a side alley, which in practice means a terrace or end-of-terrace with an outrigger. Where only one of the two exists, the honest answer is a rear extension or a side return — the combined footprint has nowhere to turn the corner.
What makes a wraparound extension different from a rear or side return alone?
A rear extension adds depth at the back of the house; a side return adds width down the alley; a wraparound does both at once, so the new floor area turns the corner of the original building rather than sitting against just one wall. The result is typically the largest open-plan space a single-storey extension can deliver, but it also means more of the original external wall is removed and more of the roof is new, which raises the structural and drainage stakes compared with either extension on its own. Homeowners who start out planning a rear extension or a side return alone often move to a wraparound once they see how little extra it costs to combine the two, since much of the groundwork, roof structure and glazing is shared between them rather than duplicated.
Do wraparound extensions need full planning permission in London?
Almost always, yes. Permitted development allowances are calculated on combined additions to the original house, and a wraparound's depth plus width together generally exceed the volume and footprint limits that apply to a rear extension or side extension considered separately. A Lawful Development Certificate route is rarely viable for a genuine wraparound.
Conservation area status and Article 4 directions, common across the terraced streets where wraparound extensions are most popular, remove permitted development rights further still, so we design every wraparound on the assumption it will go through full householder planning.
Structural design for a wraparound extension
Because the new space turns a corner, the structural frame has to work as one continuous system rather than two independent extensions bolted together.
- A continuous steel or ring-beam frame carrying the roof around the internal corner where the rear and side elements meet
- A glazed roof lantern or rooflight strip often placed at the corner junction, where natural light reaches deepest into the combined plan
- Foundations for both the rear and side elements designed together, so they tie into the existing house consistently
- Bi-fold or sliding doors across the rear elevation, coordinated with the side glazing so the two elements read as one space
| Route | What it covers | Typical fee |
|---|---|---|
| Full planning permission | Required for almost all wraparound extensions given the combined footprint | Full Planning pack ~£1,600–£2,400 |
| Planning + Building Regulations (structural) | Combined pack including structural calculations for the L-shaped frame and drainage diversion | Planning + Building Regs pack ~£2,200–£3,850 |
| Rear extension alone (comparison) | Smaller single-storey addition, may qualify for permitted development | see Rear Extension Drawings, from £1,100 |
| Side return alone (comparison) | Widens the kitchen only, keeps garden depth unchanged | see Side Return Extension Drawings, from £1,400 |
Wraparound Extension Drawings in Edgware HA8 — FAQs
How much does a wraparound extension cost to design in London?+
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Do I need an architect for a wraparound extension?+
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