🔍 Types of Home Extensions
Extensions come in many forms depending on property size, layout, budget, and planning restrictions. In Devon and Cornwall, the most common options include:
- Single-Storey Rear Extensions – ideal for kitchens, open-plan spaces, and dining rooms.
- Double-Storey Extensions – large-value upgrades adding bedrooms and extra living areas.
- Side Extensions – perfect for wide plots or unused side gardens.
- Wraparound Extensions – combines rear + side for maximum floor space.
- Over-Garage Extensions – cost-efficient option using existing structure.
- Orangery-Style Extensions – modern brick + glass hybrid rooms.
The right choice depends on space, planning rules, structural constraints, and your long-term needs.
💷 Extension Costs in Devon & Cornwall
Costs vary based on size, materials, design complexity, and structural requirements. Typical prices:
- Single-storey extension: £1,500–£2,000 per m²
- Double-storey extension: £2,000–£3,000 per m²
- Over-garage extension: £20,000–£45,000
- Wraparound extension: £40,000–£90,000+
- Orangery-style extension: £25,000–£60,000+
Always compare quotes from local installers who understand Devon/Cornwall soil conditions, drainage, and planning expectations.
📏 Planning Permission & Building Regulations
Some extensions fall under permitted development, but many require planning permission depending on size and location. Key factors:
- Height and depth of the extension
- Distance to boundaries
- Materials matching existing property
- Location on designated land (AONB, conservation areas)
- Whether the property has been extended before
Building Regulations approval is always required for:
- Foundations & structural work
- Drainage adjustments
- Electrics & heating
- Insulation & glazing
- Fire safety and escape routes
🌞 Benefits of Adding a Home Extension
- Substantial increase in living space
- Property value boost (10–25% typical)
- Better flow and more functional layouts
- Creates open-plan kitchens / family rooms
- Can avoid the cost of moving house
📍 Find Trusted Extension Installers Near You
Explore vetted and recommended extension specialists across Devon & Cornwall:
- Southwest Extension Installers
- Devon Extension Installers
- Dartmouth Extension Installers
- Kingswear Extension Installers
- Modbury Extension Installers
- Totnes Extension Installers
- Wembury Extension Installers
- Plymouth Extension Installers
- Ivybridge Extension Installers
- Saltash Extension Builders
- Liskeard Extension Installers
- Callington Extension Installers
- Launceston Extension Installers
- Torpoint Extension Installers
- Cornwall Extension Installers
- Tavistock Extension Installers
❓ Frequently Asked Questions
Do I need planning permission for an extension?
Some extensions fall under permitted development, but larger builds, double-storey extensions, and boundary proximity often require full planning approval.
How long does an extension take?
Single-storey: 8–14 weeks.
Double-storey: 12–20 weeks depending on weather and structural work.
Do extensions add value?
Yes. A well-built extension typically increases property value by 10–25% depending on size and design quality.
What foundations do I need?
Most extensions require trench-fill or deep-strip foundations depending on soil, tree roots, and load-bearing requirements.
