How to Survey & Read a Building

A proper read of an existing building is really two surveys answering two different questions, and conflating them is one of the commonest beginner errors. The measured survey asks *what is there, and where*: the geometry of the building - room sizes, wall thicknesses, ceiling and floor-to-floor heights, the positions of doors, windows and openings, changes in floor level, and where the fixed things live (drains and inspection chambers, the electrical board, where water enters). Its product is the set of accurate existing drawings that every later decision is measured against. Without them you are designing on a fiction.

The condition survey - sometimes called a building survey or defect survey - asks a completely different question: *what state is it in?* Is the structure sound; what is failing; where is it damp, cracked, sagging, decayed, corroded or overloaded; what has been repaired or bodged before. One survey tells you the shape of the canvas; the other tells you the health of the patient. You need both, and you must not let one masquerade as the other - a beautifully dimensioned plan says nothing about whether the wall it draws is crumbling, and a long list of defects is useless if you cannot say where they are.

In practice you often gather both in the same visit, moving through the building room by room with a tape in one hand and a critical eye running over every surface. But keep the findings in separate records, because they feed different decisions downstream: the measured survey feeds design and feasibility (Modules 2 and 4); the condition survey feeds diagnosis and the repair strategy (Modules 1.3 and 6). This is the diagnosis stage of the course's through-line - renovation is surgery, and a surgeon images and examines before deciding where to cut. The survey is your imaging and examination. Do it thoroughly, do it before you fall in love with any idea, and treat every later ambition as a hypothesis to be tested against what the survey actually found - not the other way round.

A measured survey is a craft, and a few habits separate a reliable one from a misleading one. Work room by room, and in each room sketch the shape freehand first, generously sized on the page, before you write a single number - a sketch you can annotate beats a tidy drawing you cannot. Then measure, and here is the single most important rule: take running dimensions from one fixed end of a wall (0, then 2140, then 2950, then 5080 to the far corner), rather than measuring each gap separately and adding them up. Separate measurements let small errors compound into a wall that does not close; running dimensions keep every point located from the same origin.

Record the things beginners forget. Measure wall thickness at every opening - it tells you a great deal later about what kind of wall you are dealing with. Note ceiling heights and floor-to-floor heights, and flag every change in floor level, however small, because level changes hide structure and drive drainage. Buildings are rarely square, so triangulate: take the diagonals of each room and the distances between window and door reveals, so a non-orthogonal room can be drawn truthfully. Locate the fixed, expensive-to-move things - drains and inspection chambers, the soil pipe, the water entry and meter, the electrical distribution board - because these constrain where kitchens and wet rooms can sensibly go.

Label everything. Every sketch gets the room name, the date, and a north point or a consistent orientation, so that weeks later you can still read your own survey. A laser measure speeds long runs and floor-to-ceiling heights, but a steel tape, graph paper and a clipboard still do the job, and a phone photo of each annotated sketch is cheap insurance. Note honestly what you could not measure - the cupboard you could not empty, the ceiling void you could not see into - so the gaps are visible rather than silently guessed. The deliverable is a set of existing plans and sections accurate enough to design on with confidence, and specific enough that a contractor pricing the work is pricing the real building, not an optimistic sketch of it.

The condition survey is where you learn to *read* a building rather than merely measure it, and the method is to be systematic and outside-in. Start outside and work around the whole building before you go in: look at the roofline for sagging or spreading, the walls for bulging, leaning, cracking or patched repairs, the ground levels against the wall (is soil or a raised path bridging the damp-proof course?), the rainwater goods (are gutters and downpipes discharging where they should, or soaking a wall?), and any vegetation growing into the fabric. Only then go inside and move room by room, looking up, down and behind - at ceilings for staining, at floors for slope or spring, into corners and behind furniture where damp and cracks hide.

The discipline here, which Lesson 1.3 develops, is to record symptoms without yet guessing their cause. Write and photograph what you actually see - a damp patch, a crack, a stain, a sag - and resist the urge to diagnose on the spot, because premature diagnosis makes you stop looking. Note cracks with their location, direction and rough width (a coin or a ruler in the photo gives scale), and whether they step through mortar joints or cut straight across bricks. Flag anything that suggests movement (doors that have been planed to still shut, floors that slope, gaps opening at wall-to-ceiling junctions) for a proper look later.

Photograph methodically, because the photographs become your memory. Shoot each room wide first, then the details, include a recognisable reference in close-ups, and keep the images organised by room so you can find them. Date-stamped photos also create a baseline: if a crack is monitored over months, you will want today's image to compare against. Capture the awkward, unglamorous things - the meter cupboard, the loft hatch view, the back of the boiler, the underside of the stairs - because those are exactly where the surprises live. By the end you should have, for every room and elevation, a measured record of *what is there* and an annotated, photographed record of *what state it is in* - the raw material for every diagnosis and decision to come.

Your own careful walk-round is genuinely valuable - it sharpens your eye, produces the working drawings, and tells you *what to investigate* - but it has firm limits, and knowing where those limits fall is itself a professional skill. A homeowner, student or designer with a tape and a camera can record geometry and catalogue visible symptoms. What they cannot do is diagnose structural movement, judge whether a wall is load-bearing, assess a foundation, or pronounce a building safe - and pretending otherwise is exactly the overconfidence this course exists to cure.

Commission a professional when the building shows any of the classic triggers: stepped or diagonal cracks, bulging, leaning or separating walls, sagging floors or rooflines, spreading or unexplained damp, signs of subsidence or heave, or any time you are about to remove or open up a wall or commit serious money. Match the professional to the question. A chartered building surveyor produces a full condition report and is the right first call before buying or before a major renovation of an older property. A structural engineer must assess anything touching structure - movement, load paths, removing walls, forming openings, adding load - and design any remedy. Specialist surveyors handle specific risks: damp and timber (rot and infestation), drainage (a CCTV drain survey), or asbestos and other hazards in older buildings. In India a full RICS-style building survey is less common, so you will often assemble this from a structural engineer and trusted specialists - but the principle is identical.

Treat a professional survey as an investment, not a cost. Its fee is trivial beside the price of a structural mistake, a collapsed budget, or buying a building whose defects you did not understand. This is the course's golden rule applied to the very first stage: when in doubt about structure, services or the law, stop and get a qualified professional. Your survey is not a substitute for theirs; it is the thing that tells you, intelligently and early, which professional to call and what to ask them. Do it well and you enter every later decision with your eyes open - which is the whole point of diagnosing before you change.