Loft conversion Peckham SE15 – permitted development & costs

Loft Conversions Peckham SE15 – Types, Costs & Planning

Thinking about a loft conversion in Peckham SE15? The right design can add a bedroom, office or en-suite and significantly increase your home’s value. Below is a concise guide to types, costs, timeframes and planning rules tailored to SE15 (Peckham, Nunhead, Bellenden).

Types of Loft Conversions

Rooflight (Velux)

Most affordable. No change to roofline; add insulation, staircase and roof windows. Great for offices/guest rooms.

Rear Dormer

The SE15 favourite for Victorian terraces off Rye Lane and Bellenden Road. Adds real floor area for a double bedroom + shower room.

L-Shaped Dormer

Extends over the rear outrigger (common in Peckham). Ideal for master suite or two rooms + bathroom.

Hip-to-Gable

Best for 1930s semis/end-terraces near the SE15/SE22 border. Often combined with a rear dormer for maximum space.

Mansard

Premium look with a steeper rear slope. Higher cost; sometimes preferred on sensitive streets to keep proportions.

Costs & Timeframes (Guide)

  • Rooflight: £25k–£45k · 4–6 weeks on site
  • Rear Dormer: £40k–£75k · 8–10 weeks
  • L-Shaped / Hip-to-Gable: £50k–£95k · 10–14 weeks
  • Mansard: £70k–£120k+ · 12–16+ weeks

Final pricing depends on structure, insulation, internal spec and bathroom fit-out. Allow for scaffolding, parking suspensions and Party Wall notices typical for Peckham SE15.

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Planning Permission vs Permitted Development

Many SE15 houses can convert under Permitted Development (PD) if volume, height and set-backs are respected, with materials similar in appearance. Flats/maisonettes are not PD. In conservation areas or where Article 4 applies, you’ll likely need planning. We recommend a Lawful Development Certificate for mortgage/resale even when PD is used. Building Control is always required.

Local Advice for Peckham SE15

  • Victorian terraces: Rear or L-shaped dormers give the best value uplift.
  • Services: Consider upgrading tanks/boilers and adding sound insulation to party walls.
  • Privacy: Use obscure glazing to bathrooms and sensible window placement to avoid overlooking.
  • Access: Plan for scaffold over bay windows and tight streets; book parking suspensions early.

Next Steps

  1. Free survey & feasibility: head height, structure, PD vs planning check.
  2. Design options & budget ranges with outline programme.
  3. Drawings, structural calcs, Building Control and (if needed) planning/LDC.
  4. Fixed build schedule with clear milestones and site lead.
  5. Quality finishes, handover pack and aftercare.

FAQ

Will a loft conversion add value?

In SE15, a well-planned dormer or L-shaped loft typically delivers strong resale appeal and £/sqft gains.

Do I need Party Wall notices?

Usually yes for terraces/semis. We guide you through notices and awards to keep neighbours informed.

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