loft-conversion

15 articles

• Dormer Window Construction: Flat-Roof Dormer Framing, Cheek Cladding, Lead Flashings and Planning Compliance
  Flat-roof dormer construction: trimmer joists, GRP/lead flashings (Code 4-5), tile-hung cheeks, 1:40 fall, Class B PD volume limits (40m³ terraced / 50m³ semi-detached)
• Hip to Gable Loft Conversion: Structural Implications, Planning Limits and Gaining Maximum Floor Area
  Hip-to-gable conversion: replace hipped end with vertical gable, +8-15m² floor area, Class B PD if conditions met, lateral restraint at 2m centres, semi-detached only typical
• Loft Conversion Building Control Process: Full Plans vs Building Notice, Inspection Stages and Completion Certificate
  Building Control submission: Full Plans vs Building Notice, LABC vs Approved Inspector, inspection stages, Completion Certificate critical for resale
• Loft Conversion Building Regulations Overview: Parts A, B, C, F, L and K — What Each Covers
  Loft conversion building regulations: Parts A, B, C, F, K, L Approved Documents, Building Notice vs Full Plans submission, inspection points and completion certificate
• Loft Conversion Electrical Requirements: New Circuit, Lighting, Heating and Part P Compliance
  New circuits per Part P, BS 7671 Amendment 2 RCBO per circuit, mains-wired interlinked smoke alarms (BS 5839-6 Grade D LD2), bathroom zones 0-2
• Loft Conversion Fire Escape: Part B Requirements, Mains-Wired Smoke Alarms, Escape Windows and Sprinklers
  Loft conversion fire escape: protected stair route, FD30 doors, mains-wired interlinked smoke alarms (BS 5839-6 Grade D LD2), escape window dimensions, sprinkler triggers
• Loft Conversion Floor Structure: Strengthening Ceiling Joists, Introducing New Floor Joists and Deflection Limits
  New floor joists 47×220 C24 sister-mounted alongside 75×100 ceiling joists, UC203×203 UC46 perimeter steels, 215×215×100 padstones, deflection L/333
• Loft Conversion Insulation: Between-Rafter vs Over-Rafter, Cold Roof vs Warm Roof and Part L U-Values
  Loft conversion insulation: Part L 2022 0.16 W/m²K target, cold roof vs warm roof construction, between-rafter PIR + over-rafter combinations and BS 5250 ventilation
• Loft Conversion Permitted Development Rights: Volume Limits, Hip-to-Gable Rules, Rear Dormers and Restrictions
  Loft conversion PD rights: GPDO Class B 40/50m³ volume limits, hip-to-gable, rear dormer, side window obscure-glazing, conservation area and Article 4 restrictions
• Loft Conversion Plumbing and En Suite: Gravity vs Macerator, Hot Water Supply and Venting
  Loft plumbing: gravity vs macerator WC, hot water pressure 1.0 bar minimum, vented system pump-boosted, soil pipe 110mm at 1:40 fall, AAV vs vent stack
• Loft Conversion Structural Design: Steel Beam Sizes, Purlin Support, Ridge Beam and Structural Engineer Sign-Off
  Loft conversion structural design: floor joist sizing (75×220 C24 typical), UC23–UC46 steel beams, padstones, trimmers, ridge beam for dormer, chartered engineer requirement
• Loft Conversions and the Party Wall Act: When Notices Are Required for Notching Joists on a Party Wall
  Party Wall etc Act 1996: Section 2 notices for steel-beam pocketing, raising party wall, 14-day response, surveyor route, IBG-accepted
• Loft Stairs and Building Regs: Part K Requirements, Minimum Headroom, Rise, Going and Handrail Rules
  Part K stair compliance: 42° max pitch, 220mm max rise, 220mm min going, 2R+G 550-700mm, 2.0m clear headroom (1.9m relaxation 1.5m max)
• Mansard Roof Conversion: Design Principles, Planning Permission Requirement and Typical Build Sequence
  Mansard roof conversion: 70-72° front pitch, 17.5-20° top, full planning required, 80-95% floor area gain, £60k-120k+, slate/lead detailing, £14-week typical programme
• Velux vs Dormer Loft Conversion: Planning Risk, Cost, Headroom Gain and Which to Recommend
  Velux vs dormer decision: ridge-height 2.5m+ for Velux, dormer adds 8-15m² floor, costs £20-35k vs £35-60k+, Class C vs Class B PD route