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Squotipedia
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Extensions
Extensions
15 articles
Beam and Block Ground Floors: Standard and Wide Blocks, Sleeper Walls, Insulation Layer and Part A Structural Requirements
155mm standard block vs 225mm wide block spans, sleeper wall at 1.8m centres, 100mm PIR insulation target U-value 0.13 W/m²K, Part A propped beam installation
Building Control Application: Full Plans vs Building Notice & Inspection Stages
Building control: Full Plans vs Building Notice, inspection stages, regularisation, and Building Safety Act 2022 changes
Conservatory Planning Rules: Permitted Development, Part L Exemptions & Glazing
Conservatory planning: PD rules (3m/4m rear, 50% land), Part L thermal separation exemption conditions, solid roof conversion triggers full energy compliance
Do I Need Planning Permission? Permitted Development Rules for Extensions
Permitted development for extensions: single-storey rear limits (3m/4m detached), height limits, GPDO Class A conditions
External Wall Insulation Systems: EWI Rails, Board Types & Render Finish
External wall insulation systems: EPS/mineral wool/phenolic board types, rail vs direct-fix, mandatory mineral wool fire breaks at floor levels, PAS 2030/2035 for funded work
Foundation Types for Extensions: Strip, Trench Fill, Raft & Piled
Foundation types: strip (1m min depth), trench fill, raft, piled; soil bearing capacity, Building Control requirements
Garage Conversion Checklist: Planning, Insulation, DPC & Building Regs
Garage conversion: permitted development limits, DPC requirements, insulation standards, Part P electrical notification
House Extension Build Process: Planning Timeline, Building Notice vs Full Plans, CDM Duties and Construction Sequence
House extension process: design→planning→Building Control→build sequence, CDM 2015 domestic client duties, LABC stages (foundations, DPC, drainage, roof, completion), PD 4m/3m rear extension limits
Loft Conversion Types: Velux, Dormer, Hip-to-Gable & Mansard
Loft conversion types: Velux (no planning), dormer, hip-to-gable, mansard; structural requirements, Part B escape window
Outbuildings and Garden Buildings: GPDO Class E PD Rules, Building Regs Thresholds and Electrical Supply Requirements
Outbuilding regulations: GPDO Class E PD conditions, ≤15m² fully exempt from Building Regs, 15–30m² exempt if ≥1m from boundary, Part P for electrical supply, SWA cable 450mm burial depth
Party Wall Act: When You Need a Notice, Timelines & Surveyor Costs
Party Wall Act 1996: section 1/2/6 notices, 2-month notice period, surveyor appointment, award process
Steel Beams in Domestic Extensions: RSJ Sizing, Padstones & Building Control
RSJ steel beams: universal beam selection, padstone requirements, temporary propping, Building Control submission
Underpinning: Mass Concrete Method, When It's Needed & Building Control
Underpinning: mass concrete method, staggered bay sequence (never adjacent), C25/30 concrete specification, dry packing 50mm gap, CDM excavation safety, Building Control mandatory
Warm Flat Roof Build-Up: Vapour Control Layer, PIR Insulation, Waterproofing Membrane, Falls Design and Upstand Details
VCL below PIR insulation (SR≥100 m²·s·Pa/kg), 150mm PIR for Part L U-value 0.18 W/m²K, single-ply membrane lap 50mm, 1:80 falls minimum, 150mm upstands
When Do You Need a Structural Engineer? Beam Calcs, Underpinning & Load-Bearing Walls
When a structural engineer is needed: beam calcs, underpinning, load-bearing wall identification, ground investigation