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Extending Your Home in Dulwich: What You Need to Know
Dulwich (SE21 and SE22) is one of South East London’s most desirable residential areas, known for its village atmosphere, high-quality schools, and attractive period housing. From homes near Dulwich Village and Dulwich Park to streets around East Dulwich Road, Lordship Lane, Goose Green, and residential pockets close to North Dulwich, West Dulwich, and East Dulwich stations, many properties offer excellent potential for carefully designed home extensions.
With large Victorian and Edwardian houses, generous gardens in many areas, and consistently strong demand from families, homeowners in Dulwich often choose to extend rather than relocate. Before any work begins, one key question almost always comes up:
Do I need planning permission for a home extension in Dulwich?
This guide explains planning rules, extension limits, boundary considerations, costs, and what happens if permission is missed — all written specifically for SE21 and SE22 homeowners.
Do You Need Planning Permission for a Home Extension in Dulwich?
Many home extensions in Dulwich do not require planning permission, as they fall under Permitted Development (PD) rights. However, Dulwich contains several conservation areas and protected streets, so additional checks are often required.
Extensions That Usually Do Not Require Planning Permission
You can generally extend without planning permission in Dulwich if:
- The extension is single-storey
- It extends up to 3m from the rear wall of a terraced or semi-detached house
- It extends up to 4m from the rear wall of a detached house
- The maximum eaves height is 4m
- The overall height does not exceed the existing house
- External materials closely match the original property
- No balconies, verandas, or raised platforms are included
- The extension does not cover more than 50% of the original garden area
These rules may apply to some properties on the edges of SE21 and SE22, but homes closer to Dulwich Village and East Dulwich often face tighter controls.
Larger Home Extensions Without Full Planning Permission
Under the Householder Prior Approval Scheme, homeowners can extend:
- Up to 6m on a terraced or semi-detached house
- Up to 8m on a detached house
This requires a Neighbour Consultation Scheme application and is less common in Dulwich due to conservation constraints.
Extensions That Require Planning Permission
Planning permission is normally required if:
- The property is in a conservation area, including much of Dulwich Village and East Dulwich
- The extension is double-storey
- Building works extend forward of the front elevation
- A wrap-around extension is proposed
- Roof height or ridge lines are being altered
- External finishes differ clearly from the existing building
Buildaway can confirm whether your Dulwich property is subject to restrictions before design work begins.
The 2m Boundary Rule Explained
The 2m boundary rule restricts the height of extensions built close to neighbouring boundaries.
For extensions under Permitted Development:
- Eaves height must not exceed 3m when the extension is within 2m of a boundary
This is especially relevant for side extensions on Dulwich’s period homes with limited side access.
What Happens If You Don’t Get Planning Permission?
If planning permission was required and not obtained:
- The council may issue an enforcement notice
- You could be required to alter or remove the extension
- Property sales may be delayed or fall through
- Mortgage lenders may refuse lending
In conservation areas like Dulwich, enforcement action is taken seriously.
How Much Does a Home Extension Cost in Dulwich?
Home extension costs depend on size, structure, glazing, and internal specification. Below is a realistic guide based on typical projects in Dulwich.
| Extension Type | Typical Total Cost |
|---|---|
| Single-Storey Rear Extension | £2,200–£2,800 per m² (build-only) / £2,800–£3,500 per m² turnkey |
| Double-Storey Extension | £2,000–£2,600 per m² (build-only) / £2,600–£3,300 per m² turnkey |
| Side Return Extension | £2,200–£2,900 per m² |
| Wrap-Around Extension | £2,400–£3,400 per m² |
Common Additional Costs
- Kitchens: £10,000–£25,000+
- Bathrooms: £6,000–£15,000+
- Structural steel and RSJs: £2,000–£6,000+
- Heating upgrades and Megaflo systems: £2,500–£4,500
- Bifold doors and glazing: £3,000–£8,000+
These figures reflect realistic home extension costs UK for Dulwich and surrounding areas.
Home Extension Ideas for Dulwich Homes
Popular extension approaches in Dulwich include:
- Rear extensions that respect period architecture
- Open-plan kitchen and dining spaces opening onto landscaped gardens
- Side extensions to widen ground-floor layouts
- Lower-ground or basement extensions where permitted
- Home offices and flexible family rooms
- Rooflights and carefully detailed glazing to maximise daylight
Homes near Dulwich Park, Lordship Lane, and Dulwich Village often require sensitive design solutions.
Home Extension Building Regulations in Dulwich
Even where planning permission is required, Building Regulations approval always applies.
Buildaway ensures compliance with:
- Part A (structure and steelwork)
- Part B (fire safety)
- Part F (ventilation)
- Part L (energy efficiency)
- Part P (electrical safety)
- Foundations and drainage
All inspections and certification are handled as part of the service.
FAQs
Q1. How much does a double-storey extension cost in Dulwich?
Most projects fall between £80,000 and £130,000+, depending on size and specification.
Q2. How far can I extend without planning permission?
In limited cases, 3–4m under standard PD rules or up to 6–8m under the Larger Home Extension Scheme, subject to restrictions.
Q3. Do I need planning permission for a home extension in the UK?
Not always, but conservation areas like Dulwich often require approval.
Q4. What happens if I build without planning permission?
You may face enforcement action, removal costs, and issues when selling.
Q5. How much of my garden can I build on?
Up to 50% of the original garden area, subject to planning and boundary limits.
Bringing It All Together
Whether you live near Dulwich Village, close to Dulwich Park, or in the quieter residential streets of SE21 and SE22, a well-planned home extension can add valuable space while protecting the character of your property.
Buildaway manages everything from design and planning support to construction — ensuring your Dulwich home extension is compliant, carefully managed, and finished to a high standard.