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Greenwich (SE10) is one of London's most iconic neighbourhoods, known for its maritime history, stunning period properties, and vibrant town centre. Whether you're near Greenwich Park, close to the Royal Observatory, around Cutty Sark, near Greenwich Market, living along Trafalgar Road, or close to Westcombe Park, a loft conversion is one of the most efficient ways to add new living space while staying in the SE10 area.
A key question homeowners ask is: Do I need planning permission for a loft conversion in Greenwich?
This guide explains the rules, exceptions, SE10 loft conversion costs, and the best loft styles for Greenwich properties.
Do You Need Planning Permission for a Loft Conversion in Greenwich?
Many Greenwich homes can be upgraded under Permitted Development (PD) rights — but Greenwich also has extensive conservation areas, so restrictions may apply depending on your street.
When Loft Conversions Do Not Need Planning Permission
A loft conversion can fall under PD if:
- Added volume is up to 40m³ for terraced homes
- Added volume is up to 50m³ for detached or semi-detached homes
- No part of the dormer faces the main road
- Dormer is set back at least 20cm from the eaves
- Materials match the existing property
- Side-facing windows use obscure glazing
- No balconies or raised platforms are added
This usually applies in streets around East Greenwich, Maze Hill, Westcombe Hill, and homes further from the central heritage zone.
When Loft Conversions Do Require Planning Permission
You will need planning approval if:
- Your home sits within a conservation area (large parts of Greenwich Park, Royal Hill, West Greenwich, Cutty Sark, and Ashburnham Triangle fall under this)
- You want a front dormer
- You are planning a mansard loft
- Roof height needs to be increased
- Your home has already used PD allowances
- You live in a flat, maisonette, or converted period property
Buildaway offers free PD eligibility checks tailored to SE10.
Types of Loft Conversions in Greenwich
Greenwich’s architecture makes it suitable for several types of loft conversion, each with different benefits and costs.
Velux / Rooflight Loft Conversion
Great for properties with suitable roof height.
- Lowest cost
- Clean design
- Often planning-free
- Ideal for small layouts
Rear Dormer Loft Conversion
Highly popular across SE10.
- Creates large usable space
- Works well for bedrooms and en-suites
- Often within PD (outside conservation zones)
Hip-to-Gable Loft Conversion
Common in semi-detached and end-of-terrace properties.
- Converts hip into full gable
- Often paired with a dormer
- Maximises internal space
Mansard Loft Conversion
Typical for period terraces in Greenwich.
- Always requires planning approval
- Provides the most interior space
- Blends well with historic architecture
How Much Does a Loft Conversion Cost in Greenwich?
Greenwich homes vary in age and style, so costs depend on structure and layout. Here's an SE10-specific guide:
| Type of Loft Conversion | Typical Loft Conversion Cost Greenwich |
|---|---|
| Velux / Rooflight | £25,000 – £35,000+ |
| Rear Dormer | £35,000 – £55,000+ |
| Hip-to-Gable | £50,000 – £65,000+ |
| Mansard | £60,000 – £80,000+ |
Additional Costs
- En-suite bathroom: £4,000 – £8,000+
- High-spec glazing: £2,000 – £6,000+
- Bespoke staircase: £1,500 – £4,000+
These figures reflect standard pricing for SE10 loft conversions.
Loft Conversion Building Regulations in Greenwich
All loft conversions — even PD ones — require Building Regulations approval.
You must comply with:
- Part A – Structural stability
- Part B – Fire protection (escape routes, alarms, fire doors)
- Part K – Staircase safety
- Part L – Insulation and energy performance
- Part P – Electrical standards
Buildaway handles all submissions, drawings, structural reports, and inspections.
Benefits of a Loft Conversion in Greenwich
Adds Significant Property Value
Homes near Greenwich Park, Royal Hill, Cutty Sark, West Greenwich, and Maze Hill often see increases of 10%–20%.
Avoids the High Cost of Moving
Staying in SE10 and extending upwards is typically more cost-effective than relocating.
Offers Flexible New Rooms
Popular choices include:
- Master suite with en-suite
- Home office
- Guest room
- Children's room
- Creative or wellness space
Works for Many Greenwich Property Styles
Period homes, terraces, and semis all adapt well to loft improvements.
FAQs
How much does a loft conversion cost in Greenwich?
Most SE10 lofts range from £35,000–£60,000, depending on the design.
Do loft conversions need planning permission in Greenwich?
Not always — PD applies in some areas, but conservation zones require approval.
How long does a loft conversion take?
Most projects take 6–10 weeks.
Do loft conversions require Building Regulations approval?
Yes — all SE10 lofts must follow fire, electrical, and structural standards.
How much does adding an en-suite cost?
Usually £4,000–£8,000+, depending on layout.
Bringing It All Together
Whether you're near Greenwich Park, Cutty Sark, Royal Hill, Maze Hill, Trafalgar Road, or Greenwich Market, a loft conversion is one of the most effective ways to add both space and value to your home.
Buildaway provides complete loft conversion services across SE10, including:
Detailed pricing
Planning guidance
High-quality construction with an 18-month workmanship warranty