Wraparound extension drawings in Barnet

Where the national limits bite

Permitted development judges both parts together: Limits apply to the total enlargement (new part plus any existing enlargement it joins). The rear element is limited to 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey, and the side element to Side extension: single storey, max 4 m high, max half the width of the original house.

Barnet's heritage layers make the route more likely to be planning than permitted development. The borough has 16 conservation areas, 15 Article 4 directions covering 48 mapped areas, and 651 listed buildings. In a conservation area: On article 2(3) land (conservation areas etc.): no side extensions, no cladding, no rear extension of more than one storey under Class A.

Trees are a second filter. The council publishes 718 tree preservation orders and 3,219 tree preservation zones, and a rear garden can fall within one. We plot trees at the survey stage and tell you early if a report is needed.

Barnet's applications and appeals

In the latest published twelve months the council decided 1,361 householder applications. It granted 80.2 per cent and decided 95.1 per cent inside eight weeks or an agreed extension.

Barnet is one of the boroughs where appeals give a second measure. The Planning Inspectorate decided 413 householder appeals and allowed 50.6 per cent. That tells you that a refusal here is sometimes overturned, but we aim to avoid the appeal altogether by drawing against the council's rule.

Larger rear extensions that rely on neighbour consultation did poorly: 18 granted and 103 refused. For a wraparound, a full householder application is the safer route. The council's fee is £548, paid to the council.

Homes, values and the levy

52.5 per cent of households live in a house and 52.7 per cent own their home. A terraced house averaged £634,437 in the latest Land Registry figures, and gardens make up 28.1 per cent of the land, so there is real room to extend across the borough.

Barnet charges its own levy: £361.44/m² indexed 2026 (schedule rate £300/m², residential incl. C2, C3, C4 and sui generis HMOs).

Glazing, party walls and what we deliver

A wraparound turns the corner with a lot of glass, and the simple energy route caps it: Windows, roof windows, rooflights and doors in an extension should not exceed 25% of the extension floor area plus the area of openings removed or covered. Our SAP calculations service covers any design that goes over.

Two boundaries mean two sets of notices. A new wall up to the line needs: Line-of-junction (new wall) notice at least 1 month before work. Excavation near a neighbour's foundations is separate: Adjacent excavation notice at least 1 month before work: within 3 m and deeper than the neighbour's foundations, or within 6 m and cutting a 45° line from their foundations. Our party wall notices service prepares them.

Wraparound extension drawings in Barnet start at £1,195 including VAT. You receive plans, elevations, sections, location plan and block plan, each checked by a second chartered technologist.

Related pages for Barnet

The borough overview is architectural drawings in Barnet. If you want a smaller scheme, see side return extension drawings in Barnet or rear extension drawings in Barnet.

Neighbouring councils write different rules: wraparound extension drawings in Haringey, Enfield and Brent. The national rules are on the wraparound extension drawings page.