How much does a wrap-around extension cost?

In Dorset, budget £55,000–£100,000 for the build plus £3,000–£6,000 in professional fees. Wrap-arounds offer good value per m² because of the shared structure at the L-junction.

Do I need planning permission for a wrap-around extension?

In most cases, yes — the side element typically requires planning permission. We can sometimes split the project into a PD rear element and a planning application for the side, depending on your property and timelines.

How long does a wrap-around extension take to build?

The build takes 14–20 weeks. With design and planning, the total project timeline is 7–10 months from first contact to completion.

Is a wrap-around better than just a rear extension?

If you have side space to use, a wrap-around creates significantly more living area for relatively modest additional cost (the side wing shares foundations and roof drainage with the rear). It is the best option for maximising ground-floor space.

Wrap-Around Extension Guide: Cost, Planning & Design in New Forest

Q: Do I need planning permission for a wrap-around extension guide: cost, planning & design in New Forest?

It depends on your specific property. Much of the New Forest falls within the New Forest National Park, which has its own planning authority (NFNPA). Properties inside the National Park have significantly reduced Permitted Development rights. Properties outside the park boundary but within the district follow standard PD rules. New Forest District Council approves approximately ~85% of householder applications. We assess your project and property designations before recommending the planning route — many New Forest homeowners find they only need a Certificate of Lawfulness (£1,500).

A wrap-around extension combines a side return and rear extension into one L-shaped space. It is the most ambitious single-storey option, typically creating a large open-plan kitchen-living-dining room that wraps around the corner of the house. Here is what New Forest homeowners — covered by New Forest District Council — need to know about costs, planning, and timelines.

Local cost range — New Forest

£2,000–£3,000/m²

New Forest properties — especially those inside the National Park — require premium natural materials to comply with NFNPA design guidelines. Expect 10–20% higher build costs than the Dorset average.

Wrap-Around Extension Guide: Cost, Planning & Design rules in New Forest

New Forest falls under New Forest District Council (New Forest District Council). Much of the New Forest falls within the New Forest National Park, which has its own planning authority (NFNPA). Properties inside the National Park have significantly reduced Permitted Development rights. Properties outside the park boundary but within the district follow standard PD rules.

Planning applications (annual)

~2,500

Average decision time

8 weeks

National Park coverage

Significant

Approval rate

~85%

Fixed prices, no surprises

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What you need to know

What is a wrap-around extension?

A wrap-around extends your home on two sides — typically the rear and one side — forming an L-shape when viewed from above. This creates the maximum ground-floor space from a single project. It works particularly well on corner plots and semi-detached properties with side access.

Design possibilities

The L-shape naturally creates distinct zones: a kitchen area in one wing, a dining space in the corner, and a living area in the other wing. Bi-fold doors across the rear connect the space to the garden. Corner glazing where the two wings meet adds dramatic natural light.

Planning and PD

The rear element may fall under PD (up to 4m/8m). The side element typically requires planning permission unless it stays within the existing side wall plane. We assess each wing separately and advise on the most efficient route — sometimes a hybrid approach (PD for the rear, planning for the side) saves time.

How much does it cost in New Forest?

Local New Forest rates: £2,000–£3,000/m². The table below shows national Dorset figures for reference.

Item	Typical Cost Range
Build cost (25–40m²)	£55,000–£100,000
Professional fees	£3,000–£6,000
Corner glazing	£3,000–£8,000 extra
Kitchen	£10,000–£30,000
Party wall (per neighbour)	£700–£1,500
Contingency (15%)	£8,000–£15,000

Prices based on Dorset rates, 2026. Local New Forest range: £2,000–£3,000/m².

Planning permission in New Forest

Wrap-around extensions usually require planning permission for the side element, even if the rear element falls under PD. We recommend applying for the full project under one planning application for simplicity.

The rear wing may qualify as PD if it meets standard depth limits. Side extensions under PD must not exceed half the width of the original house and must match the existing ridge height. In practice, most wrap-arounds benefit from a single planning application.

New Forest District Council — local planning context

Much of the New Forest falls within the New Forest National Park, which has its own planning authority (NFNPA). Properties inside the National Park have significantly reduced Permitted Development rights. Properties outside the park boundary but within the district follow standard PD rules.

New Forest District Council processes approximately ~2,500 planning applications per year, with an approval rate of ~85%. Average decision time is 8 weeks.

Building regulations

Complex junction between the two wings requires careful structural design. Drainage from both wings must be coordinated. The corner area where the wings meet needs particular attention for waterproofing and structural continuity.