PB
PlanBuildCo
Purbeck stone house with traditional local materials, typical of Swanage and the Isle of Purbeck

Extension plans · Swanage, Dorset

House Extension Plansin Swanage

Extension design pack

£250

Fixed price. 2-3 layout options. 48-hour delivery.

Start my extension plan

Based in Poole since 2017 · Covering Swanage and the wider Dorset area

Fixed prices, no surprises
Local team covering Swanage
Secure Stripe payments
No pressure, no calls

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 Swanage

m
m

6m × 4m = 24m²

Estimated cost in Swanage

£57385 – £76360

Excl. VAT (£11477 – £15272)

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.

1

Share your space

Paste a Rightmove link or upload photos with rough measurements. Takes 60 seconds.

2

Receive your options

We draw 2-3 professional floor plan options and share them through your online portal within 48 hours.

3

Decide with confidence

Love it? We handle scanning, planning applications, and builder coordination. No obligation.

Professional extension floor plan for Swanage homeowner

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.

1

Design Discovery

£250

2-3 floor plan options from photos or Rightmove

2

3D Laser Scan

£650

Millimetre-accurate measured survey of your home

3

Lawfulness Certificate

£1,500

Permitted Development certificate application

4

Planning Application

£2,200

Full Householder Planning Application submission

Common questions

Extension plans in Swanage

Areas we cover

Extension plans across Dorset

PooleBournemouthChristchurchWimborneWarehamNew ForestSalisburyDorchesterWeymouthFerndownRingwoodBlandfordSwanageVerwood

Ready to start your extension in Swanage?

Get 2-3 professional floor plan options for £250. No obligation, no follow-up calls.

Start my extension plan

Every plan drawn by qualified drafters · Covering Swanage and the wider Dorset area