Can I add a second floor to my bungalow?

Yes, but it always requires planning permission and significant structural work. You will need to strengthen or replace the foundations and wall structure. It is a major project but can double your living space.

How much does it cost to extend a bungalow?

A rear extension costs £35,000–£65,000. A dormer conversion costs £40,000–£65,000. Adding a full upper floor costs £80,000–£150,000. The right option depends on how much space you need and your budget.

Can I convert my bungalow loft?

If the ridge height is adequate (minimum 2.2m from top of joists to ridge), yes. Most bungalow loft conversions add dormer windows to create enough headroom and floor area for habitable rooms.

Will neighbours object to my bungalow becoming a house?

Potentially. In areas with many bungalows (especially retirement areas), neighbours may object to the change in character. Sensitive design — stepping the upper floor back from the boundaries, using dormer windows rather than a full second storey — can mitigate objections.

Bungalow Extension Guide: Rear, Side, Upwards & Conversions in Christchurch

Q: Do I need planning permission for a bungalow extension guide: rear, side, upwards & conversions in Christchurch?

It depends on your specific property. BCP Council follows standard Permitted Development rules. Single-storey rear extensions up to 4m (detached: 8m) from the original rear wall do not require planning permission, subject to conditions on height, boundaries, and materials. BCP Council approves approximately ~89% of householder applications. We assess your project and property designations before recommending the planning route — many Christchurch homeowners find they only need a Certificate of Lawfulness (£1,500).

Bungalows offer unique extension opportunities. You can extend outwards (rear or side), upwards (adding a first floor), or convert the roof space. Here is what Christchurch homeowners — covered by BCP Council — need to know about costs, planning, and timelines.

Local cost range — Christchurch

£1,900–£2,700/m²

Christchurch's conservation areas can require upgraded materials (natural stone, matching brickwork) that increase costs by 10–15% compared to non-designated properties.

Bungalow Extension Guide: Rear, Side, Upwards & Conversions rules in Christchurch

Christchurch falls under BCP Council (Bournemouth, Christchurch and Poole Council). BCP Council follows standard Permitted Development rules. Single-storey rear extensions up to 4m (detached: 8m) from the original rear wall do not require planning permission, subject to conditions on height, boundaries, and materials.

Planning applications (annual)

~4,500

Average decision time

8 weeks

Approval rate

~89%

Conservation areas

30+

Fixed prices, no surprises

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What you need to know

Extension options for bungalows

Bungalows can be extended in four ways: (1) Rear extension — same as a house, but simpler structurally; (2) Side extension — adds a bedroom or garage; (3) Roof conversion — adds rooms in the loft space (often with dormers); (4) Full upper floor — transforms the bungalow into a house. Each has different cost, planning, and design implications.

Adding an upper floor

Adding a full upper floor is the most transformative option — it doubles the living space. This always requires planning permission and significant structural work (strengthening foundations and walls to carry the additional load). It is a major project but offers the best value per square metre for bungalow owners needing multiple extra rooms.

Dormer conversions

If the bungalow already has roof space with adequate ridge height, dormer windows can create habitable rooms upstairs at a fraction of the cost of a full upper floor. Hip-to-gable conversions on hipped-roof bungalows create particularly generous first-floor space.

How much does it cost in Christchurch?

Local Christchurch rates: £1,900–£2,700/m². The table below shows national Dorset figures for reference.

Type	Typical Cost Range
Rear extension (single storey)	£35,000–£65,000
Side extension	£25,000–£50,000
Dormer roof conversion	£40,000–£65,000
Full upper floor addition	£80,000–£150,000
Hip-to-gable + dormers	£55,000–£80,000

Prices based on Dorset rates, 2026. Local Christchurch range: £1,900–£2,700/m².

Planning permission in Christchurch

Rear extensions follow standard PD rules. Side extensions under PD must not exceed half the width of the original house. Adding an upper floor or dormers visible from the highway requires planning permission. In retirement areas like Ferndown, neighbours may object to a bungalow becoming a house — design sensitivity matters.

Standard PD rules apply for rear and side extensions. Loft conversions under PD allow 50m³ for detached bungalows and 40m³ for semi-detached. Adding a full upper floor always needs planning permission.

BCP Council — local planning context

BCP Council follows standard Permitted Development rules. Single-storey rear extensions up to 4m (detached: 8m) from the original rear wall do not require planning permission, subject to conditions on height, boundaries, and materials.

BCP Council processes approximately ~4,500 planning applications per year, with an approval rate of ~89%. Average decision time is 8 weeks.

Building regulations

Key considerations for bungalows: existing foundations may need strengthening for an upper floor, roof structure upgrades for loft conversions, fire safety provisions for the new first floor (escape windows, fire doors, protected staircase), and accessibility considerations if the home is currently step-free.