Blocks for an accessibility compliance audit drawing

An audit drawing is a measurement exercise, not a design one

The mindset shift I had to make moving from design drawings to accessibility audit drawings is that you're not proposing anything, you're documenting reality against a fixed standard and flagging every gap, and that means every dimension on the drawing needs to be a real measured figure, not a rounded approximation carried over from an old design set. A door that was specified with a certain clear width might have lost twenty or thirty millimetres to a thicker frame or an added closer during installation, and that's exactly the kind of thing an audit drawing exists to catch.

So before anything else, the audit drawing needs an honest existing conditions base, ideally from a fresh site measure, because auditing against a design intention rather than the built reality defeats the entire purpose of the exercise.

Marking accessible routes and clearances

The primary job of the audit plan is tracing the accessible route through the building or site and flagging every point where clearance narrows below the standard your jurisdiction requires, whether that's a doorway, a corridor pinch point, or a turning circle in a bathroom that's tighter than it needs to be. The wheel chair accessible symbol marks compliant points clearly, and I'll usually pair a second, distinctly coloured marker for non compliant points so the two categories are visually separable at a glance rather than requiring someone to read every note individually.

Door clear widths need to be dimensioned at the actual clear opening, not the nominal leaf size, since ironmongery, closers and the way a door is hung can eat into that figure meaningfully, and that gap between nominal and actual clear width is one of the most common audit findings on older buildings.

Corridor width matters just as much as doorway width along an accessible route, and it's worth measuring at the narrowest point rather than a general average, since a corridor that's generous for most of its length but pinches down around a radiator or a structural column at one point still fails if that pinch point is below the required clearance.

Accessible parking and external access

Accessible parking bays get audited on both dimension and gradient, since a bay that's wide enough but sits on a slope steeper than the accepted maximum still fails, and both figures need to be on the drawing, not just the bay outline. Use the wheel chair accessible symbol positioned within the bay at its correct proportions relative to the bay width, and note the measured gradient alongside it so the finding is self contained on the drawing rather than requiring cross reference to a separate survey sheet.

The route from parking to the building entrance matters just as much as the bay itself, and this is where paving comes into the audit too, an uneven or badly jointed paving surface along that route is a genuine accessibility finding, so showing the actual paving block pattern and flagging any section with significant unevenness or a joint gap wider than the accepted tolerance belongs on the drawing, not just in a written report.

Gates, thresholds and door hardware

Any gate on an accessible route needs auditing for clear opening width when fully open, operating force, and threshold height, and an iron gate with a narrow pedestrian leaf next to a wider vehicle leaf is a common finding where only the vehicle leaf actually meets the required clear width, meaning the everyday pedestrian route technically fails even though the gate looks generously sized overall. Mark this distinction clearly on the drawing rather than treating the gate as a single compliant or non compliant unit.

Threshold height at any door or gate on the accessible route matters too, since even a modest upstand can be a genuine barrier, and noting the measured threshold height directly against each opening on the audit drawing gives whoever's actioning the findings a prioritised, specific list rather than a vague instruction to 'review thresholds.'

Stairs, ramps and alternative routes

Where a stair is the only route to a level and no ramp or lift exists, that's a significant audit finding worth flagging prominently, and where a stair does have an accessible alternative, the audit drawing should show both routes clearly so it's obvious the accessible path was actually considered rather than assumed. Stair details that matter for the audit include handrail height, continuity of handrail past the top and bottom nosing, and whether nosings themselves are marked with contrasting strips, all of which should be noted against the stair block rather than left to the written report alone.

For any circular or unusual stair configuration, note that non standard geometry can affect step uniformity in a way that's itself an audit consideration, since inconsistent going and riser dimensions within a single flight are a common trip hazard finding on older or bespoke staircases.

Ramp gradient deserves the same measured rigour as parking bay gradient, and it's a common finding that a ramp installed to look roughly right ends up steeper than the accepted maximum once actually measured with a level, particularly on older buildings where a ramp was added later as a retrofit rather than designed in from the start.

Mistakes that undermine an audit's credibility

A few habits will quietly undercut an otherwise thorough audit if you're not careful. The first is measuring under ideal conditions, an empty corridor with nothing in it, when the real world test is whether that clearance holds up with a bin store, a fire extinguisher cabinet or a radiator actually in place, since those fixed obstructions are exactly what shrinks a nominally compliant corridor down to a genuine pinch point, and an audit that measures the drawing rather than the lived in building misses the finding that actually matters on site.

The second is rounding measurements to convenient figures rather than recording what the tape or laser measure actually showed, since a door recorded as 'about 800mm' when it's genuinely closer to 780mm can be the difference between pass and fail depending on the standard being applied, and an auditor's credibility rests entirely on those figures being exact rather than approximated for tidiness.

And a mistake worth naming directly, letting a client's expectations about budget quietly influence which findings get included, is one I'd push back on hard, since the whole value of an independent audit collapses the moment findings start getting filtered by what's convenient to fix rather than what's actually there.

Turning the drawing into an action list

The most useful accessibility audit drawings I've produced pair every flagged item with a number that cross references a findings schedule, listing the specific standard being measured against, the measured figure, the required figure, and a suggested remedy, so the drawing becomes the visual index into a document that's otherwise just a long table. Basically, the drawing should let someone actioning the findings walk the building with it in hand and know exactly what needs fixing where, without having to translate between a written report and a plan that doesn't visually match it.

I'd rather over-document a marginal finding than leave it out because it seemed minor at the time, since the client actioning the report is the one deciding what's urgent versus what can wait, and that decision should be theirs to make with full information rather than filtered by what I judged worth including.