Table of Contents
Extending Your Home in Greenwich: What You Need to Know
Greenwich (SE10 and parts of SE3) is one of South East London’s most recognisable residential areas, known for its historic streets, period homes, and strong village-style neighbourhoods. From properties near Greenwich Park and the Royal Observatory to homes around Greenwich Town Centre, Maze Hill, Westcombe Park borders, and residential streets close to Cutty Sark and Greenwich stations, many houses offer opportunities for carefully planned home extensions.
With a mix of Victorian and Georgian terraces, townhouses, and family homes, alongside excellent transport links and open green spaces, many homeowners in Greenwich choose to extend rather than relocate. Before any work begins, one key question is always asked:
Do I need planning permission for a home extension in Greenwich?
This guide explains planning rules, extension limits, boundary considerations, costs, and what happens if permission is missed — all written specifically for Greenwich homeowners.
Do You Need Planning Permission for a Home Extension in Greenwich?
Many home extensions in Greenwich do not require planning permission, as they can fall under Permitted Development (PD) rights. However, Greenwich contains extensive conservation areas and protected streets, so additional checks are often necessary.
Extensions That Usually Do Not Require Planning Permission
You can generally extend without planning permission in Greenwich 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 properties on the edges of SE10 and SE3, but homes closer to Greenwich Park and the town centre 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 central Greenwich due to conservation restrictions.
Extensions That Require Planning Permission
Planning permission is normally required if:
- The property is in a conservation area, which covers much of Greenwich
- 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 Greenwich property is affected before design work starts.
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 commonly affects side extensions on period homes with narrow access, which are typical across Greenwich.
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 areas with historic protection like Greenwich, enforcement action is taken seriously.
How Much Does a Home Extension Cost in Greenwich?
Home extension costs depend on size, structure, glazing, and internal specification. Below is a realistic guide based on typical projects in Greenwich.
| 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 Greenwich and surrounding areas.
Home Extension Ideas for Greenwich Homes
Popular extension approaches in Greenwich include:
- Rear extensions designed to complement period architecture
- Kitchen and dining spaces opening onto landscaped gardens
- Side extensions for improved internal width
- Lower-ground or basement extensions where permitted
- Home offices and flexible living areas
- Rooflights and carefully detailed glazing to increase daylight
Homes near Greenwich Park and along historic streets often require sensitive design solutions.
Home Extension Building Regulations in Greenwich
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 can I extend my home 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.
Q2. Do I need planning permission for a home extension in the UK?
Not always, but areas with conservation controls like Greenwich often require approval.
Q3. How much does a double-storey extension cost in Greenwich?
Most projects fall between £80,000 and £130,000+, depending on size and finish.
Q4. What happens if I build without planning permission?
You may face enforcement action, removal costs, and difficulties 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 Greenwich Park, close to the town centre, or in the quieter residential streets of SE10 and SE3, a well-planned home extension can add valuable space while respecting the character of your property.
Buildaway manages everything from design and planning support to construction — ensuring your Greenwich home extension is compliant, carefully managed, and finished to a high standard.