Extension plans · Christchurch, Dorset
House Extension Plansin Christchurch
Extension design pack
Fixed price. 2-3 layout options. 48-hour delivery.
Based in Poole since 2017 · Covering Christchurch and the wider Dorset area
Extension types
Whatever your extension, we design it.
Single-storey extension
Rear or side extensions to add a kitchen, dining room, or living space. The most popular option.
Two-storey extension
Double the space with bedrooms above and living space below. Requires planning permission in most cases.
Internal reconfiguration
Move walls, open up rooms, and redesign your existing layout without extending the building footprint.
Cost estimator
Rates for Christchurch
6m × 4m = 24m²
Estimated cost in Christchurch
Excl. VAT (£10925 – £15824)
Local insight: Christchurch's conservation areas can require upgraded materials (natural stone, matching brickwork) that increase costs by 10–15% compared to non-designated properties.
Want a professional layout?
Upload your floor plan — 2–3 options in 48hrs
First room £29.99 · Additional rooms £19.99
From £29.99 →How it works
Three steps to your extension plan.
Share your space
Paste a Rightmove link or upload photos with rough measurements. Takes 60 seconds.
Receive your options
We draw 2-3 professional floor plan options and share them through your online portal within 48 hours.
Decide with confidence
Love it? We handle scanning, planning applications, and builder coordination. No obligation.
House Extensions in Christchurch: Heritage Character, Modern Living
Christchurch combines historic charm with coastal living. The town centre — centred on the Priory and the ancient High Street — is one of the oldest settlements in Dorset, while the suburbs of Highcliffe, Mudeford, and Somerford offer a mix of period and modern homes. Extending a property in Christchurch means understanding which areas carry heritage constraints and which offer straightforward Permitted Development opportunities. Our team designs for both.
Highcliffe and Mudeford Coastal Properties
Highcliffe and Mudeford sit along the coast with a mix of 1930s bungalows, post-war detached homes, and modern infill developments. Many of these properties enjoy sea views that an extension can capitalise on. We design layouts that open living spaces toward the garden and coast, incorporating large glazed panels and bi-fold doors. Properties on the cliffside may face additional planning scrutiny due to erosion risk, which we factor into our designs from the start.
Christchurch Town Centre and Priory Area
The town centre around the Priory, Quay, and Convent Walk is a designated conservation area with several listed buildings. Extensions here require sensitivity to the historic fabric and may need full planning permission even for relatively modest additions. Our designs for conservation area properties use sympathetic materials and roof forms that satisfy BCP Council's heritage officers while delivering the extra space homeowners need.
Somerford and Burton Estates
The residential estates of Somerford, Purewell, and Burton are predominantly post-war housing — three-bedroom semis and detached homes on regular plots. Standard Permitted Development rights apply, making single-storey rear extensions straightforward. These properties are ideal candidates for kitchen-diner extensions that open onto the rear garden, and we design layouts that maximise the available projection within PD limits.
Typical properties in Christchurch
Houses in Church Street, Christchurch — residential properties near the historic Priory
Fig. 2
Detached post-war house with garage and garden, typical of Christchurch's Somerford and Mudeford estates
Fig. 3
Planning Permission for Extensions in Christchurch
Christchurch falls under BCP Council, the same unitary authority that covers Bournemouth and Poole. The town has a large conservation area covering the historic centre, plus proximity to the River Avon and Christchurch Harbour which brings flood risk considerations for some properties.
How do conservation areas affect extensions in Christchurch?
The Christchurch conservation area covers the town centre, Priory grounds, Quay, and surrounding streets. Within this zone, Permitted Development rights for extensions are restricted — meaning you may need full planning permission for work that would normally be PD in an unrestricted area. We check every property's conservation status before starting a design, ensuring you know the planning route and costs upfront.
Are there flood risk issues for extensions near Christchurch Harbour?
Properties near Christchurch Harbour, the River Avon, and the River Stour may fall within Flood Zone 2 or 3. Extensions in these areas require a Flood Risk Assessment and may need flood-resilient construction methods. We identify flood zone constraints early in the design process and produce layouts that include raised floor levels and water-resistant materials where required, satisfying both planning and Building Regulations.
House Extension Options in Christchurch: Cost & Planning Comparison
| Extension Type | Typical Cost/m² | Planning Required? | Typical Duration |
|---|---|---|---|
| Single-storey rear | £1,800–£2,500 | Usually PD (not in conservation area) | 8–12 weeks |
| Two-storey rear | £1,500–£2,200 | Often PD | 12–16 weeks |
| Bungalow extension | £1,800–£2,400 | Usually PD | 8–12 weeks |
| Conservation area ext. | £2,000–£2,800 | Planning required | 14–20 weeks |
Costs are indicative for Christchurch and vary by specification, site conditions, and builder. Our £250 design pack helps you compare options before committing.
Detailed plans you can build from.
Your extension design pack includes 2-3 professional floor plan options with accurate dimensions, room flow, and layout variations. Drawn by qualified drafters — not AI-generated renders.
- 2-3 layout options included
- Accurate room dimensions
- Share directly with builders
- Planning application ready
Transparent pricing
Every step is fixed-price.
Design Discovery
2-3 floor plan options from photos or Rightmove
3D Laser Scan
Millimetre-accurate measured survey of your home
Lawfulness Certificate
Permitted Development certificate application
Planning Application
Full Householder Planning Application submission
Common questions
Extension plans in Christchurch
Areas we cover
Extension plans across Dorset
Also serving nearby: Bournemouth, New Forest, Wimborne
Ready to start your extension in Christchurch?
Get 2-3 professional floor plan options for £250. No obligation, no follow-up calls.
Every plan drawn by qualified drafters · Covering Christchurch and the wider Dorset area