Extension plans · Weymouth, Dorset
House Extension Plansin Weymouth
Extension design pack
Fixed price. 2-3 layout options. 48-hour delivery.
Based in Poole since 2017 · Covering Weymouth 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 Weymouth
6m × 4m = 24m²
Estimated cost in Weymouth
Excl. VAT (£9821 – £14720)
Local insight: Weymouth offers some of the most affordable build rates in the area. Seafront properties are the exception — salt air exposure requires marine-grade materials.
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 Weymouth: Coastal Properties, Expert Design
Weymouth is Dorset's largest seaside town, with a housing stock that ranges from the elegant Georgian terraces along the Esplanade to Victorian streets in Westham, post-war estates in Littlemoor and Southill, and modern developments at Chickerell and Radipole. Coastal location, flood risk zones, and conservation area constraints all influence how extensions are designed here. Our team has experience with every property type Weymouth offers.
Georgian Seafront and Town Centre Properties
Weymouth's seafront terraces along the Esplanade and the surrounding streets of the old town are Grade I and Grade II listed, sitting within the town centre conservation area. Extensions to these properties require Listed Building Consent and full planning permission. Our designs for seafront properties focus on rear and basement additions that preserve the iconic Georgian facades while creating modern living space behind the historic frontage.
Victorian and Edwardian Homes in Westham and Rodwell
The residential streets of Westham, Rodwell, and Wyke Regis contain solid Victorian and Edwardian homes on varied plots. Many back onto gardens that slope toward the harbour or coast. Single-storey and two-storey extensions work well here, though sloping sites may require stepped foundations and retaining walls. We design for the actual ground conditions, including level changes and drainage considerations specific to these hillside locations.
Post-War Estates and Modern Developments
Littlemoor, Southill, Preston, and the newer developments at Chickerell offer straightforward extension opportunities on regular plots with standard PD rights. Three-bedroom semis and detached homes are the most common property types. We design efficient kitchen-diner and garden room extensions that maximise your available build-able area without exceeding PD limits, keeping your project simple and cost-effective.
Typical properties in Weymouth
Royal Terrace, Weymouth — Regency terrace dating from 1816 on the seafront esplanade
Fig. 2
Frederick Place, Weymouth — Georgian terrace originally laid out on the gardens of Gloucester Lodge
Fig. 3
Planning Permission for Extensions in Weymouth
Weymouth falls under Dorset Council. The town has a large conservation area covering the Georgian seafront, old town, and harbour area. Coastal flood risk affects some properties, particularly near the harbour and along the Esplanade. Properties outside the conservation area generally have full Permitted Development rights.
Are there heritage restrictions for extensions in Weymouth?
The Weymouth conservation area covers the seafront terraces, old town streets, harbour, and parts of Chapelhay. PD rights are restricted within this zone. Listed buildings — and Weymouth has many — require Listed Building Consent for any alteration. We check your property against Dorset Council's records and advise on the specific consents required before starting a design, avoiding surprises and wasted application fees.
How does coastal flood risk affect extensions in Weymouth?
Properties along the Esplanade, near the harbour, and in low-lying areas of Radipole may fall within Flood Zones 2 or 3. Extensions in these zones require a Flood Risk Assessment and may need flood-resilient construction. Ground-floor finished levels may need to be raised above the predicted flood level. We identify these constraints at the design stage and incorporate appropriate mitigation measures into our layouts.
House Extension Options in Weymouth: Cost & Planning Comparison
| Extension Type | Typical Cost/m² | Planning Required? | Typical Duration |
|---|---|---|---|
| Single-storey rear | £1,700–£2,400 | Usually PD | 8–12 weeks |
| Two-storey rear | £1,500–£2,100 | Often PD | 12–16 weeks |
| Listed property ext. | £2,200–£3,200 | Planning + LBC required | 16–24 weeks |
| Flood zone extension | £2,000–£2,800 | Planning + FRA required | 14–20 weeks |
Costs are indicative for Weymouth 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 Weymouth
Areas we cover
Extension plans across Dorset
Also serving nearby: Dorchester, Wareham, Poole
Ready to start your extension in Weymouth?
Get 2-3 professional floor plan options for £250. No obligation, no follow-up calls.
Every plan drawn by qualified drafters · Covering Weymouth and the wider Dorset area