# Mock-Up Room Before a Full Office Fit-Out: What It Catches

> A fit-out mock-up room is a full-size, finished sample of a typical space, such as a workstation bay, meeting room or washroom, built with the specified products before the rest of the floor. It tests finishes, lighting, acoustics, ergonomics and services interfaces together, and once signed off it becomes the benchmark the remaining work is built and snagged against.

## A mistake built once is a lesson; built on every bay it is a cost

On a typical office floor most of the area is the same few spaces repeated:
the workstation bay, the small meeting room, the washroom, the cabin. Every
decision made for one of them is made dozens of times. If the laminate looks
wrong under the building's lights, if the floor box lands under a desk leg, if
the meeting room rings like a bathroom, the error is not found once. It is found
on the last bay, after it has been built on all the others.

A mock-up room moves that discovery to the start. It is a full-size, finished
version of a typical space, built with the actual specified products, in which
the client, the designer and the contractor can see, sit, talk, switch the
lights on and make a call before the rest of the floor is committed.

The common misconception is that a sample board does the same job more cheaply.
It does not. A sample board shows materials one at a time. A mock-up shows them
**assembled**, and most of the problems it catches sit at the junctions: where
the carpet meets the partition, where the desk meets the floor box, where the
light meets the screen.

## What a mock-up catches that drawings and samples miss

| Area | What the mock-up shows | What drawings and samples tend to miss |
| --- | --- | --- |
| Finishes | Colour and texture under the building's own lighting and daylight; edge details, joints, grain direction | Samples are viewed in a different light, in small pieces, without edges |
| Lighting | Glare on screens, shadows on the desk, how faces look, reflections in glass partitions | A lighting layout shows positions and levels, not how the room feels |
| Acoustics | Echo in a hard-finished meeting room, speech heard through a partition, ceiling flanking | A partition rating describes a wall in a laboratory, not the built room |
| Ergonomics | Desk height, chair adjustment, monitor reach, pedestal clashes, space behind a pulled-out chair | Plan drawings show footprints, not a seated person |
| Services interfaces | Floor boxes against desk legs, socket heights against joinery, diffusers, lights, sprinklers and speakers in one ceiling | Separate trade drawings each look correct on their own |
| Washrooms and pantries | Tile setting out, fixture heights, falls to drains, mirror lighting, accessory positions | Fixtures are approved from catalogues, not in relation to each other |
| Doors and hardware | Closing force, handle feel, glass markings, vision panels and sightlines | Hardware is chosen from a schedule |

Some of these can be measured in the mock-up as well as judged. Illuminance on
the working plane can be checked against the design, with interior illumination
practice set out in **IS 3646 (Part 1)**. Reverberation time in a meeting room
can be measured using the method in **ISO 3382-2**, which turns "it sounds
echoey" into a number the acoustic designer can act on. The concepts behind
the acoustic checks are covered under
[acoustic design for offices](/services/interior-fit-out/acoustic-design-for-offices).

## Which spaces to mock up, and when it is worth it

A mock-up earns its cost where repetition is high or the consequences of a
wrong choice are visible every day. It is usually worth building when:

- **The space repeats many times**, across one large floor, several floors or a
  rollout across branches, where the mock-up becomes the template for every site.
- **A product is new to the client or the team**, such as an unfamiliar
  workstation system, an acoustic ceiling or a feature finish.
- **Several stakeholders must agree**, and a physical room settles debates that
  drawings and renders keep reopening.
- **Ergonomics matter to the brief**, where chairs and desks should be tried by
  the people who will use them. Work chair requirements are covered in
  **IS 17631**, and desk dimensions in **EN 527-1**, but neither replaces a
  seated trial.

It is harder to justify on a small, single-floor fit-out using familiar,
standard products. There, a lighter approach works: build the **first bay of the
real layout** to full finish, inspect it, and hold the rest of that area until
it is approved. The same principle applies; only the scale changes.

Timing decides whether the mock-up helps or hurts the programme. It has to be
reviewed **before bulk orders are placed** for the items it tests, which means
the mock-up products themselves are ordered early, in small quantities. A
mock-up approved after the furniture and finishes are already in production
has no authority to change anything. How sample approvals feed ordering is
covered in [material samples and approvals before ordering](/blog/material-samples-and-approvals-before-ordering).

## How the interior mock-up differs from a facade mock-up

Facades use mock-ups too, but for a different purpose. A
[facade mock-up](/glossary/facade-mock-up-testing) is often tested in a rig for
air, water and structural behaviour under named test methods before production
is released. Its verdict is a test result.

An interior mock-up is mostly a functional and visual check, judged by the
people who will use the space, supported by a few measurements. Its verdict is
a decision. That makes the sign-off process more important, not less, because
nothing objective will force a decision if nobody owns it.

## How to sign off a mock-up

1. **Agree the purpose in advance.** List what the mock-up is testing:
   finishes, lighting, acoustics, furniture, services positions. Anything not
   on the list is not being approved.
2. **Name the decision-maker.** One person signs for the client. Facilities, IT,
   design and HR or ergonomics advise.
3. **Review it in real conditions.** Lights on and off, daylight at different
   times of day, a laptop on the desk, a video call in the meeting room, a
   door opened and closed, a tap run in the washroom.
4. **Record comments in one list**, with photographs and an owner for each.
5. **Revise and re-inspect** the items that changed, not the whole room.
6. **Sign off in writing**, listing the approved products, finishes, heights and
   positions, and any accepted variations.
7. **Keep it as the benchmark.** Leave the mock-up standing where possible, or
   record it thoroughly, so that [snagging](/glossary/snagging) on the rest of
   the floor is measured against something everyone agreed.

## Common mistakes

- **Building it with substitute products.** A mock-up made from whatever was in
  stock approves nothing about the specified items.
- **Building it too late.** If bulk orders are already placed, the mock-up can
  only confirm, not correct.
- **Review by committee with no decision-maker.** Comments accumulate, nothing
  is closed, and the programme absorbs the delay.
- **Checking appearance only.** The room looks right, but nobody sat at the
  desk, made a call or tried to plug in a laptop.
- **Viewing it under temporary lighting.** Finishes approved under site lamps
  look different under the final fittings.
- **Demolishing it straight after approval.** The benchmark disappears just
  when snagging needs it.

## What to ask before building a mock-up

- Which spaces will be mocked up, and why those?
- Are the mock-up products the exact specified items, and when will they arrive?
- Where in the programme does the review sit, relative to bulk ordering?
- Who signs off, who advises, and how long is the review window?
- What will be measured as well as looked at?
- Will the mock-up stay as the quality benchmark until handover?

A design-and-build contractor should be able to show the mock-up as a dated step
in the programme, with the ordering dates it controls.

## Standards referenced

Interior illumination practice in **IS 3646 (Part 1)**; measurement of
reverberation time in **ISO 3382-2**; work tables and desk dimensions in
**EN 527-1**; work chairs in **IS 17631**. Lighting levels, acoustic targets and
ergonomic requirements for a specific project are set by the project's designers
and consultants, and the mock-up checks the design against them rather than
replacing it.

## Frequently asked questions

### What is the difference between a mock-up room and a sample board?

A sample board shows a material on its own, usually under showroom or office lighting. A mock-up shows the materials assembled at full size, in the building's own light, with the joints, edges, fixings, outlets and furniture in place. Most problems a mock-up finds are at the junctions between products, which a sample board cannot show.

### Which spaces are worth mocking up?

The ones that repeat. A typical workstation bay, a standard meeting room, a washroom or pantry, and a standard cabin are the usual candidates, because a mistake in any of them is copied many times. One-off spaces such as a reception are better handled with large finish samples and close design review than with a full mock-up.

### Does a mock-up delay the fit-out?

It needs a slot in the programme and fast decisions, but it should sit inside the period when long-lead items are being manufactured, not after it. What delays a project is a mock-up built late, reviewed by too many people without a decision-maker, or approved after bulk orders have already been placed.

### Who should sign off the mock-up?

One named decision-maker for the client, advised by the people who will live with the result: facilities, IT, the design team and, for workstations, whoever owns ergonomics or HR. Comments should be collected in one list with photographs, and the sign-off should be in writing and list what was approved.

### Is an interior mock-up the same as a facade mock-up?

No. A facade performance mock-up is tested for air, water and structural behaviour against named test methods before production. An interior mock-up is mostly a visual and functional check judged by the people who will use the space, with a few measurable checks such as illuminance on the desk or reverberation time in a meeting room.

### Can we build the mock-up on our own floor?

Usually that is the most useful place, because the daylight, ceiling height and base-building services are real. A corner of the floor or the first bay of the actual layout can serve as the mock-up, provided the rest of that area is held until approval and the mock-up is protected for use as the benchmark.

## Sources

- [IS 3646 (Part 1)](https://standards.bis.gov.in/website/published-standards/department-wise) — Interior illumination - general requirements and recommendations for working interiors
- [ISO 3382-2](https://www.iso.org/standards.html) — Measurement of room acoustic parameters - reverberation time in ordinary rooms
- [EN 527-1](https://standards.cencenelec.eu/ords/f?p=CEN:105) — Office furniture - work tables and desks - dimensions
- [IS 17631](https://standards.bis.gov.in/website/published-standards/department-wise) — Furniture - work chairs - specification

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Source: https://hagerstone.com/blog/mock-up-room-before-full-fit-out