https://regsuk.com/construction/building-regs/part-s/diagram-i-the-relationship-between-regulations-and-guidance-in-the-approved-documents https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-s/figures/diagram-i-p6.png A diagram illustrating the structure of an approved document, showing the legal requirement in a box and the statutory guidance as explanatory text below it. Diagram i: The relationship between regulations and guidance in the approved documents https://regsuk.com/construction/building-regs/part-o https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/pdf-page:6 Diagram showing the structure of approved documents, with a box for 'Requirement' (the law) and a larger box for 'Intention' (statutory guidance). Diagram i: The relationship between regulations and guidance in the approved documents https://regsuk.com/construction/building-regs/part-c/diagram-1-distribution-of-shrinkable-clays-and-principal-sulphate-sulphide-bearing-strata-in-england-and-wales https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/map-of-england-and-wales-showing-the-geographic-distribution-p15.png Map of England and Wales showing the geographic distribution of various shrinkable clays, including London clay, Gault clay, and Mercia Mudstone, relevant to foundation design. Diagram 1: Distribution of shrinkable clays and principal sulphate/sulphide bearing strata in England and Wales https://regsuk.com/construction/building-regs/part-a/table-1-areas-at-risk-from-house-longhorn-beetle https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/architectural-elevations-and-an-isometric-view-showing-dimen-p16.png Architectural elevations and an isometric view showing dimensional constraints for residential buildings, including maximum height and minimum width proportions. Diagram 1: Size and proportion of residential buildings of not more than three storeys https://regsuk.com/construction/building-regs/part-a/table-2-wall-types-considered-in-this-section https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/isometric-drawings-of-non-residential-buildings-and-annexes--p17.png Isometric drawings of non-residential buildings and annexes with flat and pitched roofs, indicating maximum height dimensions and roof slopes. Diagram 2: Size and proportion of non-residential buildings and annexes https://regsuk.com/construction/building-regs/part-s/diagram-1-1-determining-associated-parking-spaces-and-site-boundaries-example-1 https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-s/figures/diagram-1-1-p14.png A plan view diagram showing two dwellings with gardens and various parking spaces, illustrating which parking spaces are considered 'associated' based on site boundaries. Diagram 1.1: Determining associated parking spaces and site boundaries, example 1 https://regsuk.com/construction/building-regs/part-s/diagram-1-2-determining-associated-parking-spaces-and-site-boundaries-example-2 https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-s/figures/a-site-plan-showing-a-building-with-multiple-car-parks-lands-p15.png A site plan showing a building with multiple car parks, landscaping, and on-street parking, demonstrating how to define the site boundary and associated parking. Diagram 1.2: Determining associated parking spaces and site boundaries, example 2 https://regsuk.com/construction/building-regs/part-c/table-3-examples-of-possible-contaminants https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/three-sets-of-before-and-after-plan-diagrams-showing-methods-p25.png Three sets of before-and-after plan diagrams showing methods for managing subsoil drains during building construction: re-laying, diverting a single drain, and diverting multiple drains. Diagram 3: Subsoil drain cut during excavation https://regsuk.com/construction/building-regs/part-a/diagram-3-determination-of-wall-thickness https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-flowchart-outlining-the-decision-making-process-for-determ-p18.png A flowchart outlining the decision-making process for determining appropriate wall thickness by checking conditions related to the building and the wall itself. Diagram 3: Determination of wall thickness https://regsuk.com/construction/building-regs/part-s/diagram-6-1-electric-vehicle-charge-points-serving-accessible-parking-spaces https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-s/figures/a-dimensioned-plan-view-of-two-accessible-parking-bays-with--p36.png A dimensioned plan view of two accessible parking bays with a shared central access zone, showing the placement of EV charge points relative to the bays. Diagram 6.1: Electric vehicle charge points serving accessible parking spaces https://regsuk.com/construction/building-regs/part-a/diagram-4-parapet-walls-height https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/cross-section-details-of-type-a-cavity-and-type-b-solid-para-p19.png Cross-section details of Type A cavity and Type B solid parapet walls, illustrating the relationship between wall thickness and maximum parapet height. Diagram 4: Parapet walls: height https://regsuk.com/construction/building-regs/part-c/table-4-maximum-recommended-exposure-zones-for-insulated-masonry-walls https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/four-cross-section-diagrams-illustrating-construction-option-p27.png Four cross-section diagrams illustrating construction options for ground-supported floors, showing different placements of insulation and damp-proof membranes relative to the concrete slab and hardcore. Diagram 4: Ground supported floor – construction (see paragraph 4.7) https://regsuk.com/construction/building-regs/part-a/diagram-5-maximum-floor-area-enclosed-by-structural-walls https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/plan-views-illustrating-the-maximum-floor-area-limits-70m-fo-p20.png Plan views illustrating the maximum floor area limits: 70m² for floors enclosed by structural walls on all sides, and 36m² for floors enclosed on three sides. Diagram 5: Maximum floor area enclosed by structural walls https://regsuk.com/construction/building-regs/part-s/diagram-6-2-electric-vehicle-charge-point-locations-which-may-serve-more-than-one-parking-space https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-s/figures/diagram-6-2-p37.png A diagram showing two arrangements of four parking bays, illustrating how a single EV charge point can be positioned to serve two adjacent parking spaces. Diagram 6.2: Electric vehicle charge point locations which may serve more than one parking space https://regsuk.com/construction/building-regs/part-c/diagram-5-suspended-timber-floor-construction-see-paragraph-4-14a-i https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/cross-section-detail-of-a-suspended-timber-floor-constructio-p28.png Cross-section detail of a suspended timber floor construction, showing the relationship between airbricks, damp-proof course, insulated floor joists, oversite concrete, and hardcore. Diagram 5: Suspended timber floor – construction (see paragraph 4.14(a) (i)) https://regsuk.com/construction/building-regs/part-s/diagram-6-3 https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-s/figures/diagram-6-3-p40.png An example of a sign for a future EV charge point location, with the text 'Dedicated position for electric vehicle charge point' inside a rounded rectangular border. Diagram 6.3: Label for future connection location example (not to size) https://regsuk.com/construction/building-regs/part-a/diagram-6-map-showing-wind-speeds-in-m-s-for-maximum-height-of-buildings https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-collection-of-maps-and-graphs-for-wind-load-calculation-in-p21.png A collection of maps and graphs for wind load calculation, including a UK wind speed map, diagrams of orographic zones, and graphs for determining Orography Factor O. Diagram 6: Map showing wind speeds in m/s for maximum height of buildings https://regsuk.com/construction/building-regs/part-c/diagram-6-suspended-floor-preventing-water-collection-see-paragraph-4-14a https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/two-diagrams-illustrating-how-to-prevent-water-collection-in-p28.png Two diagrams illustrating how to prevent water collection in a sub-floor void on a sloping site by providing external drainage to intercept water flow. Diagram 6: Suspended floor – preventing water collection (see paragraph 4.14(a)) https://regsuk.com/construction/building-regs/part-c/diagram-7-typical-floors-exposed-from-below https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/a-building-section-showing-examples-of-floors-exposed-from-b-p30.png A building section showing examples of floors exposed from below, such as those over an open passageway or a parking area, which require specific thermal protection. Diagram 7: Typical floors exposed from below https://regsuk.com/construction/building-regs/part-s/diagram-6-4 https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-s/figures/diagram-6-4-p41.png Front and side elevation drawings of a floor-mounted EV charge point, showing minimum clearance dimensions required around the unit for access and maintenance. Diagram 6.4: Minimum space requirements for floor-mounted charge point location https://regsuk.com/construction/building-regs/part-a/diagram-7-maximum-height-of-buildings https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-flowchart-detailing-the-steps-to-calculate-the-maximum-all-p23.png A flowchart detailing the steps to calculate the maximum allowable building height, involving wind speed, orographic factor, altitude factor, and site location. Diagram 7: Maximum height of buildings https://regsuk.com/construction/building-regs/part-s/diagram-6-5 https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-s/figures/front-and-side-elevation-drawings-of-a-wall-mounted-ev-charg-p41.png Front and side elevation drawings of a wall-mounted EV charge point, indicating minimum mounting height range and clearance dimensions from walls and objects. Diagram 6.5: Minimum space requirements for wall-mounted charge point location https://regsuk.com/construction/building-regs/part-c/diagram-8-damp-proof-courses-see-paragraph-5-5b https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/two-wall-to-floor-junction-cross-sections-demonstrating-the--p32.png Two wall-to-floor junction cross-sections demonstrating the correct placement of a damp-proof course (DPC), ensuring it is continuous with the floor membrane and at least 150mm above ground level. Diagram 8: Damp proof courses (see paragraph 5.5(b)) https://regsuk.com/construction/building-regs/part-a/table-8-value-of-factor-x-see-diagram-14 https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-detailed-cross-section-of-a-multi-storey-building-with-a-g-p24.png A detailed cross-section of a multi-storey building with a gable roof, illustrating the correct points for measuring various storey and wall heights. Diagram 8: Measuring storey and wall heights https://regsuk.com/construction/building-regs/part-c/diagram-9-protecting-inner-leaf-see-paragraph-5-5c https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/diagrams-showing-methods-to-protect-the-inner-leaf-of-a-cavi-p32.png Diagrams showing methods to protect the inner leaf of a cavity wall from moisture, including extending the cavity below the DPC and installing a damp-proof tray with weep holes. Diagram 9: Protecting inner leaf (see paragraph 5.5(c)) https://regsuk.com/construction/building-regs/part-a/2c34-the-requirements-for-lateral-restraint-of-walls-at-roof-and-floor-levels-are-given-in-table-9-and-guidance-on-satis https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/cross-sections-of-one-two-and-three-storey-buildings-showing-p26.png Cross-sections of one, two, and three-storey buildings showing which walls require different compressive strength conditions (A, B, or C) based on their location and loading. Diagram 9: Declared compressive strength of masonry units https://regsuk.com/construction/building-regs/part-c/diagram-10-protection-of-wall-head-from-precipitation-see-paragraph-5-9c https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/a-cross-section-of-a-parapet-wall-head-illustrating-the-use--p33.png A cross-section of a parapet wall head, illustrating the use of a coping and an underlying damp-proof course to prevent water penetration from precipitation. Diagram 10: Protection of wall head from precipitation (see paragraph 5.9(c)) https://regsuk.com/construction/building-regs/part-a/diagram-10-maximum-span-of-floors https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/two-simple-diagrams-showing-a-floor-member-bearing-directly--p27.png Two simple diagrams showing a floor member bearing directly on a wall and on a joist hanger, both indicating a maximum floor span of 6 meters. Diagram 10: Maximum span of floors https://regsuk.com/construction/building-regs/part-a/diagram-11-differences-in-ground-levels https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-series-of-cross-sectional-diagrams-illustrating-rules-for--p28.png A series of cross-sectional diagrams illustrating rules for walls with differences in adjacent ground levels, showing retained heights and load limits. Diagram 11: Differences in ground levels https://regsuk.com/construction/building-regs/part-c/diagram-12-uk-zones-for-exposure-to-driving-rain https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/a-map-of-the-united-kingdom-showing-four-distinct-zones-of-e-p36.png A map of the United Kingdom showing four distinct zones of exposure to driving rain, from 'Sheltered' to 'Very severe', with key cities located for reference. Diagram 12: UK zones for exposure to driving rain https://regsuk.com/construction/building-regs/part-a/diagram-12-openings-in-a-buttressing-wall https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/an-isometric-drawing-of-a-buttressing-wall-showing-dimension-p29.png An isometric drawing of a buttressing wall, showing dimensional constraints for openings, including minimum distance from the supported wall and maximum opening height. Diagram 12: Openings in a buttressing wall https://regsuk.com/construction/building-regs/part-a/2c30-chases https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/an-isometric-diagram-illustrating-the-dimensional-requiremen-p30.png An isometric diagram illustrating the dimensional requirements for buttressing walls, piers, and chimneys used to provide lateral support to a main wall. Diagram 13: Buttressing https://regsuk.com/construction/building-regs/part-c/diagram-13-window-reveals-for-use-in-areas-of-severe-or-very-severe-exposure-to-driving-rain-see-paragraph-5-32-2 https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/a-plan-view-detail-of-a-window-reveal-in-a-cavity-wall-showi-p39.png A plan-view detail of a window reveal in a cavity wall, showing a checked rebate and sealant to prevent water ingress in areas with high exposure to driving rain. Diagram 13: Window reveals for use in areas of severe or very severe exposure to driving rain (see paragraph 5.32) https://regsuk.com/construction/building-regs/part-c/diagram-14-accessible-threshold-for-use-in-exposed-areas-see-paragraph-5-33 https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-c/figures/cross-section-of-an-accessible-door-threshold-designed-for-e-p40.png Cross-section of an accessible door threshold designed for exposed areas, featuring a sloped external landing with a drainage slot and a weather seal to manage water. Diagram 14: Accessible threshold for use in exposed areas128 (see paragraph 5.33) https://regsuk.com/construction/building-regs/part-a/diagram-14-sizes-of-openings-and-recesses https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-plan-view-of-a-wall-showing-various-openings-and-recesses--p31.png A plan view of a wall showing various openings and recesses, with labels for widths and piers used in formulas to determine permissible dimensions. Diagram 14: Sizes of openings and recesses https://regsuk.com/construction/building-regs/part-a/2c35-walls-should-be-strapped-to-floors-above-ground-level-at-intervals-not-exceeding-2m-and-as-shown-in-diagram-15-by-t https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-set-of-five-detailed-drawings-showing-methods-of-providing-p32.png A set of five detailed drawings showing methods of providing lateral support to walls from floors, including tension straps, restraint joist hangers, and concrete floors. Diagram 15: Lateral support by floors https://regsuk.com/construction/building-regs/part-a/diagram-16-lateral-support-at-roof-level https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/four-detailed-illustrations-showing-methods-for-providing-la-p33.png Four detailed illustrations showing methods for providing lateral support at roof level, including tension strap locations for gable walls and vertical strapping at eaves. Diagram 16: Lateral support at roof level https://regsuk.com/construction/building-regs/part-a/diagram-17-size-and-location-of-openings https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-building-plan-view-illustrating-rules-for-the-size-and-loc-p34.png A building plan view illustrating rules for the size and location of openings in small buildings, including minimum distances from corners and other walls. Diagram 17: Size and location of openings https://regsuk.com/construction/building-regs/part-a/diagram-18-wall-thickness https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/plan-view-diagrams-showing-pier-requirements-for-walls-witho-p35.png Plan view diagrams showing pier requirements for walls without openings, with a single major opening, and with two major openings, including minimum pier sizes. Diagram 18: Wall thickness https://regsuk.com/construction/building-regs/part-a/diagram-19-lateral-restraint-at-roof-level https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/an-isometric-view-of-a-building-showing-the-required-locatio-p36.png An isometric view of a building showing the required locations for lateral restraint fixings to the roof structure at eaves, base of gable, and along the roof slope. Diagram 19: Lateral restraint at roof level https://regsuk.com/construction/building-regs/part-a/diagram-20-proportions-for-masonry-chimneys https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/elevations-of-various-masonry-chimneys-showing-how-to-measur-p37.png Elevations of various masonry chimneys showing how to measure the height (H) and least horizontal dimension (W) above the roof intersection point. Diagram 20: Proportions for masonry chimneys https://regsuk.com/construction/building-regs/part-a/diagram-21-elevation-of-stepped-foundation https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-side-elevation-view-of-a-stepped-concrete-foundation-illus-p38.png A side elevation view of a stepped concrete foundation, illustrating the rules for minimum overlap (L) and maximum step height (S) relative to foundation thickness (T). Diagram 21: Elevation of stepped foundation https://regsuk.com/construction/building-regs/part-a/diagram-22-piers-and-chimneys https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-plan-view-of-a-foundation-for-piers-and-chimneys-showing-t-p38.png A plan view of a foundation for piers and chimneys, showing the required projection (X) of the foundation beyond the pier or chimney base. Diagram 22: Piers and chimneys https://regsuk.com/construction/building-regs/part-a/diagram-23-foundation-dimensions https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-cross-section-of-a-strip-foundation-under-a-wall-illustrat-p38.png A cross-section of a strip foundation under a wall, illustrating the relationship between wall thickness (W), foundation projection (P), and foundation thickness (T). Diagram 23: Foundation dimensions https://regsuk.com/construction/building-regs/part-a/diagram-24-area-at-risk-of-collapse-in-the-event-of-an-accident https://mnsmtstkvukagtkzzbzx.supabase.co/storage/v1/object/public/regs-images/part-a/figures/a-plan-and-section-view-of-a-building-s-structural-frame-ill-p47.png A plan and section view of a building's structural frame, illustrating the limited area at risk of collapse following the notional removal of a single structural element. Diagram 24: Area at risk of collapse in the event of an accident