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What is Gross Internal Area (GIA)? ​

CIL liability is based on the “chargeable area” which is calculated using the formulas set out in Regulation 40 of the CIL Regulations (2010). These require the measurement of the Gross Internal Area (GIA) floorspace of the proposed development and the GIA floorspace of any existing ‘in-use’ buildings to be demolished. 

An 'in-use' building is, in a nutshell, one in ‘lawful use’ for at least 6 months of the last 3 years. 

GIA is, in simplified terms, the internal floor area of the walls at each floor and includes*:
  • Areas occupied by internal walls and partitions; 
  • Columns, piers, chimney breasts, stairwells, lift-wells, other internal projections, vertical ducts; 
  • Atria and entrance halls, with clear height above, measured at base level only; 
  • Internal open-sided balconies, walkways; 
  • Structural, raked or stepped floors are to be treated as a level floor measured horizontally;  
  • Corridors of a permanent essential nature (e.g. fire corridors, smoke lobbies); 
  • Mezzanine floor areas with permanent access; 
  • Plant rooms, fuel & tank rooms, which are housed in a covered structure or a permanent nature, whether or not above the main roof level; 
  • Service accommodation such as toilets, bathrooms, changing rooms, cleaner’s rooms;
  • Voids over stairwells and lifts;
  • Areas with a headroom of less than 1.5m;
  • Pavement vaults;
  • Loading bays and garages;
  • Structures, such as car ports with a solid roof even with one or more open sides;
  • Porches even though the front or side(s) may be open;
  • Conservatories; 
  • Basements, underground and covered car parking areas.

The following are excluded from CIL liable floorspace*:
  • Perimeter wall thicknesses and external projections;
  • External open-sided balconies, covered ways and fire escapes;
  • Canopies;
  • Voids over or under structural raked or stepped floors;
  • Greenhouses, garden stores (sheds), fuel stores and the like, in residential properties;
  • A pergola with no roofing material;
  • Free-standing solar panels.
return to CIL PAGE
*Note that each Council may differ in what is included and excluded in CIL liable floorspace and therefore it is advisable to check with them prior to planning any works. Alterntaively, seek professional assistance and make sure that your contract with your planning consultant includes completion of the right forms correctly at the right point in time. Please get in touch for more detail. 

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  • Home
  • Services
    • Site Appraisals
    • Pre-Apps
    • Planning Strategy & Feasibility
    • Planning Applications
    • Land Promotion
    • Barn Conversions
    • Listed Buildings & Heritage
    • Professional Objections
    • Appeals
  • About Us
    • Meet the Team
    • The Role of a Planning Consultant
    • How we work
    • Terms & Conditions
    • Insurance & Legals
  • Projects
    • Small Developments >
      • Minety
      • Harwell 4 Dwellings
      • Little Chalfont Replacement Dwelling
      • Granborough Replacement Dwelling
      • Oxford 4 Dwellings
      • Camberley 2 Dwellings
      • Peterborough 3 Dwellings
      • Sutton Courtenay 3 Dwellings
      • Brightwalton 3 Dwellings
      • Cotswolds Replacement Dwelling
    • Large Developments >
      • Ninfield 43 Dwellings
      • Staines Old Fire Station
      • Stadhampton 14 Units
      • Blackheath 56 Dwellings
      • Lydiard Millicent 9 Units
      • Maulden 21 dwellings
      • Shabbington 15 Units
      • Stadhampton 21 dwellings
    • Self-Build Projects >
      • Baughurst
      • Wantage AONB
      • All Cannings Plot Subdivision
      • Didcot
      • Chalgrove Barn Annex
      • Stadhampton
      • Drayton Mill
      • Hillgreen AONB
      • Broad Town Swindon
      • South Cerney
    • Barn Conversions >
      • Corsham Barn Class Q
      • Wootton Fields Farm Barn
      • Royal Wootton Bassett Big Barn Class Q
      • Ampney Crucis Barn
      • Gainfield Farm Barn
      • Granborough Class Q
      • Glebe Farm Barns
    • Heritage >
      • Listed Thatched Cottage in East Hendred
      • West Hanney Listed Building
      • Chimney Listed Farmhouse
      • Stanford in the Vale Listed Building
      • Staines Old Fire Station
      • Buscot Park Renewable Heating Project
    • Strategic Land >
      • Stourport Yew Tree Lane
      • Earlswood, Birmingham
      • Taunton, Land south of
      • Troon, Cornwall
      • Wythall, Birmingham
      • Various Co-op Disposals
      • Shurdington, Cheltenham
    • Equestrian >
      • Goosey Stables
      • Goosey Stables 2
      • Indoor Equestrian Arena Hampshire
      • Indoor Equestrian Arena Durley
      • Equestrian Facility Plans
    • Domestic Alterations >
      • Change of Use Weston on the Green
      • Renovation of The Old Schoolhouse
      • Barn Change of Use Chalgrove
      • 2 Ancillary Outbuildings Near Witney
    • Commercial >
      • MUGA Sports Pitch
      • Commercial Premises Expansion
      • Ducklington Office Space
  • Sites for sale
    • Two Barns, Royal Wootton Bassett
    • Sites Sold >
      • Bishopswood Lane, Baughurst
      • Newington Nurseries
      • Clophill Road, Maulden
  • News
  • Advice
    • Class Q Barn Conversions
    • Community Infrastructure Levy (CIL)
    • Planning App Fees
    • Definition of Community Infrastructure Levy (CIL) Chargeable Area
    • Interactive Green Belt Map
    • Making representations to a planning committee
    • Keeping your planning permission alive
  • Contact