- Smallest dimension: Measure at several points and keep the smallest; the tightest value decides whether cabinets fit
- Substrate: Studwork, masonry and framed openings each accept fixings in a different way
- Photographs: A known-size object in frame and a slow video pan settle scale and context a supplier cannot visit
- Light: Visit at the brightest time of day and note where direct sun lands and which surfaces reflect it
- Routes: Trace power, data and the delivery path, including crate size against doorways and lifts
- Before quotes: Suppliers price the same job only once the survey fixes dimensions, substrate and routes in writing
What an LED display site survey must capture
A useful site visit produces one artefact: a measurement package that lets different suppliers price the same job. That package holds confirmed dimensions of the mounting area, photographs the supplier can read without travelling, a note on what the wall is made of, the route power and data will take, and the constraints on when work can happen. Without it, the quotations you collect describe different jobs, and comparing them tells you nothing useful.
The survey also settles scope. Measuring on site usually reveals something the drawing never showed: a column inside the screen area, a void above the ceiling too shallow for the cabinet depth, a power outlet on the far side of the room, a doorway narrower than the crate. Found before the quotation, each of these becomes a priced item. Found afterwards, each one becomes an argument about who should have known.
Measure the physical opening, not the drawing
Drawings are produced before a building is finished and revised only when somebody needs them. Dimensions on paper drift from reality by the thickness of a plaster layer or a cladding panel, and that margin is enough to decide whether a cabinet fits at all. Measure the opening at several heights and several widths, keep the smallest value you record, and treat that as the space you actually have.
Then establish what sits behind the finish. A partition built from studwork, a solid masonry wall and a framed section spanning an opening each accept fixings in a different way, and the difference determines whether the mounting needs spreader plates, additional blocking or a structure designed for the load. Note the material, its condition, and the positions where drilling is permitted.
Photograph the site the way a supplier reads it
Photographs stand in for the visit the supplier cannot make, so they have to answer the questions an installer would ask in person. Take a straight-on view of the whole mounting area from far enough back to show its edges, a wider view that includes the surrounding room, and close views of the surface itself, the ceiling above it and the floor below it.
Then add the context a photograph normally loses. Put an object of known size into at least one frame so scale cannot be guessed, mark where the screen is intended to sit, and photograph anything that will interfere: switches, sensors, sprinkler heads, lighting track, existing signage, exit signs. A short video panning slowly across the wall usually settles questions the still images leave open.
Record viewing positions and the light that reaches the wall
Where people stand decides what the screen has to do. Note the nearest and furthest position from which the display must be readable, whether viewers approach along a corridor or across an open floor, and what sits between them and the surface. Obstructions, viewing angles and the time people spend in front of the wall shape the specification more than the wall size does.
Light is the other half of the same measurement. Visit at the brightest time of day as well as at the time the screen will normally run, and note where direct sun lands, which surfaces reflect it, and whether the display would face a window. A high ambient level pushes the brightness requirement upward; a position facing glass turns reflection into the problem, not brightness.
Trace routes for power, data and physical delivery
A screen needs a supply and a signal, and both have to arrive somewhere specific. Identify the nearest point where power can be taken, the position where an isolator can be mounted, and the distance and path between them and the display. Do the same for data, and check whether either route crosses a space you do not control or a surface that cannot be reopened afterwards.
Then follow the path the hardware itself will take. Note the width of corridors and doorways, the internal dimensions of any lift, the height of the ceiling on the approach, and where a delivery vehicle can stand. Cabinets arrive in crates and the crate is larger than the cabinet, so a screen that fits the wall can still fail to reach it. Record permitted working hours, noise restrictions and any booking the loading area requires.
Turn what you measured into written supplier questions
The survey pays off when its findings become questions. Ask the supplier to state the mounting method they are assuming, what the wall must be able to carry, what tolerance their cabinets require, and who carries responsibility if the opening proves smaller than the drawing showed. Each written answer turns an assumption into something you can refer back to later.
Ask as well what happens when the site differs from what was surveyed: who funds a return visit, who designs any additional structure, and at which point the quoted scope stops. Then confirm whether the supplier will re-measure before manufacture begins. A supplier who expects to verify the measurements in person is pricing your site, not working from a template.
| Category | Capture | Why it matters |
|---|---|---|
| Dimensions | Opening at several heights and widths, smallest kept | Decides fit and mounting tolerance |
| Substrate | Wall material, condition, permitted drill points | Sets fixing method and load spread |
| Photos | Straight-on, room view, close-ups, scale object | Lets a supplier read the site remotely |
| Light | Brightest time, sun path, windows | Drives brightness and reflection plan |
| Routes | Power, data, delivery path, crate versus doorway | Surfaces hidden cost before the quote |
A drawing that hid the real size
A plan showed a clean opening, but the as-built wall was smaller and out of square. The survey caught it; quoting from the drawing would have shipped panels that did not fit.
Light the survey missed
A site was surveyed at one time of day; by afternoon sun poured onto the wall. Recording light across the day would have set a higher brightness need.
Steps for a project: site survey
- Measure the real opening, not the drawing Confirm the smallest actual dimensions on site, because as-built sizes differ from plans. The survey, not the drawing, sets the cabinet count.
- Photograph for an installer Shoot the mounting surface, access, nearby structure and light from the angles an installer needs. Photos answer questions that measurements miss.
- Record where viewers stand and the light Note the closest and widest viewing positions and the light reaching the wall. These drive pitch and brightness, which the survey must capture.
- Trace power, data and delivery routes Follow the path from supply to wall, from source to cabinets, and from truck to install point. A blocked route is a surprise nobody wants at install.
Myths about site survey
“A supplier can quote from drawings.” — Drawings miss as-built sizes, surface conditions and light. A site survey before quoting closes the gap that otherwise opens between price and invoice.
“Measurements only need to be roughly right.” — LED walls are built to the millimetre from the survey. Small errors cascade into panels that do not fit or a wall that is not square.
Verification points for site survey
- Measure the opening at several points and record the smallest value
- Identify what the wall is made of and where drilling is permitted
- Photograph the area, surface, ceiling, floor and include a scale reference
- Record nearest and furthest viewing positions and the light that reaches the wall
- Trace routes for power, data and physical delivery, including crate size
- Send the package with your brief so every supplier prices the same job
A note for the supplier: site survey
Finish the survey before you ask for a price. Confirm the smallest real dimensions, identify what the wall is made of, take photographs that answer an installer's questions, record where viewers stand and how much daylight reaches the surface, and trace the routes for power, data and delivery. Then send the whole package with your project brief through the contact page, so the first quotation you receive describes the job you actually have.