Thinking about a rear dormer loft conversion in Winchester (Fulflood, Hyde, Abbotts Barton, St Thomas)? Rear dormers are popular in terraces because they add usable headroom and a proper staircase without a big footprint increase.

Quick facts (for snippets)

• Best for: Victorian/Edwardian terraces in Fulflood, St Cross, Weeke
• Adds: 1–2 bedrooms, often an en-suite
• Cost guide: £35,000–£55,000+ (spec & structure dependent)
• Planning: Often Permitted Development (PD) outside conservation areas; planning consent commonly needed within conservation areas or on listed buildings
• Build time: 6–10 weeks once on site

Planning notes in Winchester

• Rear dormers visible from the street or in conservation areas (St Giles Hill, Cathedral Close) may require planning permission.
• Front dormers are rarely supported in heritage streetscapes.
• Consider heritage-grade materials (slate/lead, conservation rooflights).

Design tips that win approval

• Set in from party walls and eaves; keep the dormer subservient to the roof.
• Use slate cladding or lead to match context.
• Align new windows with the existing rhythm; consider obscure glazing for side views.
• Maximise light with rooflights over the stair and larger rear window for outlook.

Building Control essentials

• Stairs: ≤42° pitch, compliant headroom over centreline (~2.0–2.2 m).
• Fire safety: Protected route or alternative strategy; alarms on each storey.
• Structure: Steel/timber design by an engineer.
• Thermal/condensation: Insulation, vapour control, ventilation.

FAQ
Do I need a Party Wall Agreement? Likely, yes, in terraces/semis — serve notices early.
Can I add a balcony? Juliet balconies are more acceptable than full terraces in tight urban plots.