The most beautiful decor in the world is worthless if it cannot get through your front door.

Here is everything to measure and think about before the design starts, so nothing you order ends up wedged in a stairwell.

BRIEFING

A custom set is really built twice: once in the workshop, and once in the narrow, awkward path between your loading door and the room it lives in. That second build is where projects go wrong, and it is almost entirely preventable at the design stage. This is the full list of what to measure and consider before you commission anything, why the tightest corner matters more than the widest corridor, how accessibility changes the design and not just the install, and why a piece designed to come apart is a piece that always fits.

Every fabricator has the same horror story, and every escape-room owner is one bad measurement away from starring in it. The piece is finished. It is gorgeous. It comes off the truck, rolls up to the building, and stops. It will not fit through the door, or round the corner of the stairs, or into the lift. Now you are choosing between three bad options: cut a finished piece apart in the street and hope it goes back together, hire a crane and a window removal, or send it back to the workshop and blow the opening date.

Here is the thing nobody wants to hear: that is not a manufacturing problem. The workshop did its job. The problem was decided weeks earlier, on the day someone designed a set without measuring the road it had to travel. The good news is the reverse is also true. Get the measurements right up front and a piece the size of a car can slide into an upstairs room without a scratch. This article is the checklist I run through before I design anything, explained so you can gather what I need before we even talk.

The one principle everything else hangs on

There is a single idea underneath all of this, and if you remember nothing else, remember this: you design for the tightest point on the whole path, not for the room. A piece does not have to fit the room. It has to survive the worst pinch point between the delivery truck and its final spot, and it only has to survive it once. That one doorway, that one corner, that one lift is the real brief.

Which is why a proper project starts with a survey, not a sketch. Before I draw a single panel, I want to walk the entire journey the set will make, from the street to its resting place, and write down every place it could get stuck. Everything below is what that walk looks for.

Measure the openings (and measure them properly)

The classic mistake is measuring the wrong number. What matters is the clear opening, the actual hole the object passes through, not the nominal size of the door or the width printed on a plan. On a doorway that means the gap with the door open at ninety degrees, measured to the doorstop, minus anything that sticks into it: handles, panic bars, a door you cannot remove. Always ask whether the door leaf can come off its hinges, because that alone often buys you the few centimetres that decide everything.

And do not forget the trick every mover knows: things tilt. The diagonal of an opening is bigger than its width or its height, so a tall thin panel can often go through a low doorway at an angle, and a long object can be stood up inside a lift. Measure diagonals, not just widths, and measure the height too, including thresholds and any step.

The corner is the killer, not the corridor

This is the one that catches everyone, so read it twice. A wide corridor is easy. A turn in a corridor is where long rigid pieces die. You can have two generously wide hallways meeting at a right angle and still be completely unable to swing a long, stiff object around the corner between them, because turning it needs room along both walls at once. The longer and stiffer the piece, the more brutal the corner becomes.

So for every change of direction on the path, I want the width of both legs of the turn and the ceiling height right at the corner. Ninety-degree turns at the top and bottom of stairs, the dogleg in a back corridor, the pivot out of a lift lobby: these are the points that quietly set the maximum length of any single rigid module. It is almost never the straight bits that stop you.

Stairs and lifts: the vertical gauntlet

If the room is not on the ground floor, the journey up is usually the hardest part of the whole trip.

Stairs

For a staircase I need the width, the headroom (the height from each step to the ceiling or the underside of the flight above), and every landing and turn, because a straight flight lets you use a long diagonal while a turn or a half-landing chops that length down hard. I also need to know the load, in the very physical sense: can a team actually carry the weight up and around, or will they run out of grip and space halfway up.

Lifts

For a lift, the internal car dimensions are only half the story. The door opening is usually smaller than the car, so both matter, and again the diagonal counts, since you can often stand a long piece upright inside. I want the car width, depth and height, the door opening width and height, the rated weight capacity, and whether it is a passenger lift or a goods lift. Ask too whether the car has a removable ceiling hatch, because that can unlock extra height for a tall item. A piece that clears every doorway and still will not fit the lift is a classic, avoidable heartbreak.

Look up, and look at the floor

Two dimensions people forget because they are staring straight ahead.

Up: the piece has to travel under, and then stand up beneath, whatever is on the ceiling. Beams, ducts, pipes, light fittings and, importantly, fire sprinklers all eat into the real height, both along the path and in the room itself. A tall cabinet that fits flat on a trolley still has to be tipped upright in its final spot, and it needs the headroom to do that. It must also never block or sit too close to a sprinkler head, which is a safety and code issue, not a suggestion.

Down: weight has to travel over a floor that can bear it. On upper floors, mezzanines and in older buildings, the floor loading is a real limit, and a dense metal-and-wood set can be heavier than it looks. I would always rather know the floor type and any load limit up front than discover it with a crack.

Accessibility changes the design, not just the delivery

If your room has to be usable by players with reduced mobility, that is not a delivery detail, it is a design constraint that reaches into every prop. An accessible room needs clear turning space for a wheelchair, clear paths through the set, no trip hazards, and puzzles placed at heights a seated player can actually reach and operate.

The exact numbers are set by your local accessibility code, and you should check it (in the United States that is the ADA; other countries have their own equivalents). As a sense of scale, the ADA calls for a clear turning space about 60 inches, or 1.5 metres, in diameter, a clear doorway width of at least 32 inches, roughly 815 millimetres, and continuous accessible paths of at least 36 inches, about 915 millimetres. Those figures are worth designing to early, because retrofitting accessibility into a finished set is far more painful than building it in from the first sketch. Tell me on day one if the room must be accessible, and to which standard, and it shapes the whole design in your favour.

One more thing belongs in the same early conversation: how the room will be run and reset once it is built. The access that gets a piece in is often the same access your staff use to service and re-arm it every day, so it is worth designing the two together. I wrote a whole piece on why the reset is a design decision, and installation is its twin.

How good design makes the nightmare disappear

Here is the payoff, and the reason measuring first is liberating rather than limiting. Once I know the tightest point on your path, I do not shrink the ambition of the set. I design it to come apart. The whole piece is broken into modules, each one sized to clear your worst pinch point, that then assemble into the full thing on site.

In practice that means modelling both the set and the access path in Fusion 360, then choosing the break lines deliberately, hiding the joints where the eye will never find them, and engineering the modules to go back together fast and precisely: alignment pins and keyed joints so parts only fit one way, concealed bolts, and where the access allows it, a final weld on site. You get a set that looks like one seamless object but travelled as a flat, sensible stack of parts. That is the difference between a piece designed by someone who has carried furniture up a Paris stairwell and a piece designed by someone who has not.

The pre-commission site survey, step by step

Before you commission any custom set, walk the full journey with a tape measure and your phone, and gather this. Send it with your brief and half the risk of the project vanishes before it starts.

1. The whole path, in order. List every stage from the street or loading bay to the final room, as a sequence.
2. Every doorway. Clear opening width (door open at ninety degrees, measured to the stop), height, threshold or step, and whether the leaf can be removed.
3. Every corner and turn. The width of both legs of each turn, plus the ceiling height at the corner.
4. Stairs. Width, headroom, every landing and turn, the length of any straight flight, and how much weight a team can safely carry.
5. The lift, if used. Car width, depth and height; door opening width and height; rated weight; passenger or goods; removable ceiling hatch or not.
6. Ceilings and obstructions. Height along the path and in the room, and the location of beams, ducts, pipes, lights and sprinklers.
7. The final room. Internal dimensions, where the set will stand, and the clearance to tip tall pieces upright in place.
8. Weight and floor. Floor type and any load limit, especially on upper floors and mezzanines.
9. Services. Where the power, water, compressed air and network points are, if the set needs them.
10. Accessibility. Whether the room must be usable by reduced-mobility players, and to which standard.
11. Building logistics. Service entrance, loading dock, permitted delivery times, lift booking, protection of shared areas, insurance, security, working hours, and whether on-site cutting or welding is allowed.
12. Photos and a rough plan. Snap every tight spot and sketch the path with your numbers on it. A photo catches the pipe you forgot to measure.

Glossary

Clear opening.  the actual gap an object passes through, measured with the door open and every obstruction (stops, handles, thresholds) counted, as opposed to the nominal or plan size.

Diagonal clearance.  the fact that the diagonal of an opening is larger than its width or height, so a piece can often be tilted or stood on end to pass through.

Path of travel.  the full route a piece takes from the delivery point to its final position. The tightest point on it sets the design limit.

Pinch point.  the single narrowest or most awkward spot on the path of travel, usually a door, a corner or a lift.

Modular / knock-down design.  designing a large piece to break into smaller modules that each clear the access, then assemble into the whole on site.

Dry-fit.  test-assembling the modules in the workshop before delivery, so on-site assembly holds no surprises.

Headroom.  the vertical clearance above a path or staircase, from the floor or step to the ceiling or the flight above.

Floor loading.  how much weight a floor can safely carry, a real limit on upper floors, mezzanines and older buildings.

Goods (freight) lift.  a lift built for cargo, usually larger and stronger than a passenger lift; worth finding before you assume the passenger lift is your only option.

Accessible design.  designing the room and its props to be usable by players with reduced mobility, to the standard set by local code (for example the ADA in the US).

Planning a custom set, decor, or escape-room build?

I design and fabricate custom sets around your building, not despite it, from the first Fusion 360 sketch, broken into modules that clear your tightest doorway and assemble cleanly on site.

Send me your access measurements and the nightmare simply never happens. Beautiful, sturdy, and it fits.