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Lewisham (SE13) is a bustling and well-connected part of South-East London, known for its mix of Victorian terraces, 1930s semis, modern homes, and rapid regeneration. Whether you’re near Lewisham Shopping Centre, close to Hither Green, around Ladywell, next to Lewisham Station, or living near St John’s, a loft conversion is one of the most practical ways to increase living space without leaving SE13.
A key question homeowners ask is: Do I need planning permission for a loft conversion in Lewisham?
This guide walks through the rules, exceptions, Lewisham loft conversion costs, and the best loft styles for SE13 homes.
Do You Need Planning Permission for a Loft Conversion in Lewisham?
Most Lewisham homes fall under Permitted Development (PD) rights — meaning planning permission is not required if your loft meets certain conditions.
When Loft Conversions Do Not Need Planning Permission
You can usually convert your loft 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 highway
- Dormer sits at least 20cm from the eaves
- Exterior materials match the existing property
- Side windows are obscure glazed
- No raised platforms or balconies are added
PD typically applies in areas around Hither Green, Ladywell Fields, Loampit Hill, Lewisham Park, and streets further from conservation boundaries.
When Loft Conversions Do Require Planning Permission
You will need planning approval if:
- Your home is in a conservation area (parts of Ladywell, St John’s, and Lewisham Park Conservation Areas fall under this)
- You want a front dormer
- You plan a mansard loft
- Roof height must be increased
- Your home has used PD rights before
- You live in a flat, maisonette, or converted building
Buildaway offers a free PD eligibility check tailored to Lewisham’s planning zones.
Types of Loft Conversions in Lewisham
Lewisham’s variety of homes makes many loft designs suitable.
Velux / Rooflight Loft Conversion
Great for roofs with good internal height.
- Lower cost
- Minimal external change
- Often planning-free
- Ideal for simple layouts
Rear Dormer Loft Conversion
Very popular across SE13.
- Creates significant floor space
- Works well for bedrooms and en-suites
- Often possible under PD
Hip-to-Gable Loft Conversion
Common in 1930s semis in Lewisham.
- Converts hip into a vertical gable
- Frequently paired with a dormer
- Maximises loft space
Mansard Loft Conversion
Suited to Victorian terraces and period homes.
- Always requires planning approval
- Offers the most internal space
How Much Does a Loft Conversion Cost in Lewisham?
Lewisham homes vary widely in structure and size, but here’s an accurate SE13 cost breakdown:
| Type of Loft Conversion | Typical Loft Conversion Cost Lewisham |
|---|---|
| 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 reflect consistent pricing across Lewisham and surrounding areas.
Loft Conversion Building Regulations in Lewisham
All Lewisham loft conversions must meet Building Regulations, even without needing planning permission.
These include:
- Part A – Structural strength
- Part B – Fire safety
- Part K – Staircase safety
- Part L – Energy efficiency and insulation
- Part P – Electrical standards
Buildaway handles structural drawings, inspections, and certification.
Benefits of a Loft Conversion in Lewisham
Increases Property Value
Homes near Ladywell, St John’s, Hither Green, and Lewisham Station often see 10%–20% value boosts after a loft conversion.
More Affordable Than Upsizing
Adding space upward is often cheaper than buying a larger home in SE13.
Creates Flexible New Rooms
Common uses include:
- Master suite
- Office space
- Guest room
- Kids’ bedrooms
- Creative studio
Works for Many Lewisham Property Types
Terraces, semis, and larger period homes all convert well.
FAQs
How long does a loft conversion take in Lewisham?
Most SE13 loft conversions take 6–10 weeks, depending on structure and layout.
How much does a loft conversion cost?
Most Lewisham lofts range from £35,000–£60,000.
Do Lewisham loft conversions require planning permission?
Some do, especially in conservation areas, but many fall under PD.
Do I need Building Regulations approval?
Yes — all loft conversions must follow structural and fire safety rules.
How much extra does an en-suite cost?
Typically £4,000–£8,000+, depending on layout and fixtures.
Bringing It All Together
Whether you're near Lewisham Station, Hither Green, Ladywell Fields, St John’s, Loampit Hill, or Lewisham Park, a loft conversion is one of the most effective ways to add extra living space and boost property value.
Buildaway provides complete loft conversion services across SE13, including:
Clear pricing
Planning guidance
High-quality construction with an 18-month workmanship warranty