# Automotive and Engineering Plants: Sheds, Crane Bays, Floors and Offices

> Automotive plant construction builds around a production line with a fixed start-of-production date: large-span sheds, crane bays designed into the frame, floors built for machine and forklift loads, and offices and canteens for shift workforces. Process layout, crane duty and floor loads must be fixed before steel is ordered, and later phases planned so expansion keeps the line running.

## Built to a start-of-production date

An automotive or engineering plant serves a production line, and the line has a
start-of-production date the business has already committed to its customer. Machines
arrive on that schedule whether the building is ready or not. A floor not cured in
time, a crane that cannot be commissioned or a power supply that is late holds up the
launch, and a launch date missed in this sector is felt in the customer relationship as
well as the plant.

The misconception is that the shed is the easy part and the machines are the hard part.
The building has to be designed around the machines from the start: their loads, their
foundations, the crane that serves them and the services they draw.

## Buildings and the services behind them

| Building or space | What drives it | Service |
| --- | --- | --- |
| Production and assembly shed | Large clear spans, process layout | [PEB industrial buildings](/services/peb/peb-industrial-buildings-and-warehouses) |
| Crane bays, press and machine shops | Crane capacity, duty and hook height | [Crane gantry and material handling](/services/peb/crane-gantry-and-material-handling) |
| Shop floor and machine bases | Machine, rack and forklift loads | [Industrial flooring and hardstanding](/services/construction/industrial-flooring-and-hardstanding) |
| Stores and platforms | Mezzanines and steel structures inside the shed | [Mezzanine floors and steel structures](/services/peb/mezzanine-floors-and-steel-structures) |
| Envelope, daylight, ventilation | Roof and walls for a hot, busy shop floor | [PEB roofing and wall cladding](/services/peb/peb-roofing-and-wall-cladding) |
| Plant power | Distribution from incomer to machines | [Electrical works HT/LT](/services/mep/electrical-works-ht-lt) |
| Fire protection | Hydrant and sprinklers to the consultant's design | [Firefighting systems](/services/mep/firefighting-systems) |
| Plant offices, canteen, amenity | Shift workforce and visitors | [Industrial and factory construction](/services/construction/industrial-and-factory-construction) |

## The crane and the span set the shed

Large-span pre-engineered sheds suit these plants because the line layout wants as few
columns as possible. Where an overhead crane is needed, it becomes the main structural
driver: it applies moving loads in three directions, its hook height sets the eaves, and
gantry rails need tighter tolerances than general steelwork. Crane structural design
follows **IS 807**, and the building frame **IS 800:2007**. If a crane might be added in a
later phase, the frame and foundations should be designed for it now; strengthening a
built frame later is slow and disruptive.

The crane also claims space that other trades want. Light fittings, sprinkler pipework,
roof ventilators and cable trays have to sit clear of the crane's travel and hook path,
and maintenance access to them cannot depend on stopping the crane for long. Settling
these positions on one coordinated drawing, before the roof services are installed,
avoids the common sight of fittings relocated after the first crane test.

## Floors that carry machines, racks and forklifts

Shop floors see point loads from machines and racking, wheel loads from forklifts, and
oil, coolant and impact. Heavy or vibrating equipment such as presses normally gets
isolated foundations, sized by the structural engineer from the machine supplier's data
and designed in concrete to **IS 456**. Where automated or narrow-aisle equipment runs,
floor flatness should be specified and measured to a defined method such as
**ASTM E1155**. Joints are where most floors fail first, as explained in
[why industrial floor joints break](/blog/industrial-floor-joints-why-they-break).

## Offices, canteens and the shift workforce

Plant offices, quality rooms, training rooms and canteens serve people working in shifts,
and the changeover peak sets the size of entries, washrooms and dining. Placing them well
reduces walking time and keeps visitors off the shop floor. The planning choices are
covered in [factory canteen and amenity block planning](/blog/factory-canteen-and-amenity-block-planning).

## Expanding while the line runs, and supplier parks

Engineering plants grow in phases, often beside a line that cannot stop. The new shed is
built separated from the running plant, and every tie-in to existing structure and
services is planned into agreed shutdown windows; see
[factory expansion while production runs](/blog/factory-expansion-while-production-runs).

Component makers often build in supplier parks near a vehicle plant. Programmes follow
the customer's launch, plots are tight, and the park's own building rules and shared
utilities sit alongside statutory approvals.

## Common mistakes

- **Steel ordered before the crane is fixed.** The frame then needs strengthening.
- **Machines on the general slab.** Vibration and settlement crack the floor around them.
- **No allowance for the next phase.** Expansion means rebuilding gable walls and services.
- **Canteens sized on headcount, not changeover.** Queues form at every shift change.
- **Park rules read after design.** Setbacks and utility connections force a redesign.
- **Roof services drawn without the crane.** Lights and sprinkler pipes clash with the hook.

## What to ask before steel is ordered

- Is the process layout frozen, with machine loads and foundation data in hand?
- What crane capacity, span, duty class and hook height is the frame designed for?
- Which machines need isolated foundations?
- Where will the next phase go, and what is provided for it now?
- How are shutdown windows for tie-ins agreed with production?

## Standards referenced

Steel design to **IS 800:2007**; crane structures in **IS 807**; concrete to **IS 456**;
floor flatness measurement to **ASTM E1155**; fire and life safety for industrial
occupancy in **NBC 2016, Part 4**. Crane loads, floor and foundation design and fire
protection for a particular plant are established by the project's structural and fire
consultants and the authority having jurisdiction.

## Frequently asked questions

### Why does the crane have to be known before the shed is designed?

Because an overhead crane puts moving vertical, sideways and lengthways loads into the frame, and its hook height sets the building height. The capacity, span and duty class shape the columns, gantry girders and foundations. Adding a crane to a frame not designed for one usually means significant strengthening.

### Should heavy machines sit on the main floor slab?

Often not. Presses and machines that vibrate or impose heavy concentrated loads usually get their own foundations, separated from the general floor so movement and vibration are not passed into it. Which machines need this is decided by the structural engineer using the machine supplier's load and foundation data.

### Can a plant be expanded without stopping production?

Usually, if it is planned that way. The new building is constructed separated from the running plant, and the connections to existing structure and services are done last, in agreed shutdown windows. The shutdown plan should be fixed before work starts, not negotiated once the new shed is up.

### What is different about building in a supplier park?

Supplier parks cluster component makers close to a vehicle plant, so programmes are tied to the customer's launch dates and plots are often tight. The park's own building rules, shared utilities and access arrangements apply alongside statutory approvals, so they should be read before the layout is fixed.

### Do plant offices and canteens need separate buildings?

Not always. They can sit in a separate block, along the side of the shed or on a mezzanine. The choice depends on headcount per shift, the walking distance from the line, noise and fumes, and whether the office needs a view of the shop floor. Shift changeover peaks usually set the size of canteens, washrooms and entries.

## Sources

- [IS 800:2007](https://standards.bis.gov.in/website/published-standards/department-wise) — General construction in steel - code of practice
- [IS 807](https://standards.bis.gov.in/website/published-standards/department-wise) — Design, erection and testing (structural portion) of cranes and hoists - code of practice
- [IS 456](https://standards.bis.gov.in/website/published-standards/department-wise) — Plain and reinforced concrete - code of practice
- [ASTM E1155](https://www.astm.org/products-services/standards-and-publications.html) — Standard test method for determining FF floor flatness and FL floor levelness numbers
- [NBC 2016, Part 4](https://www.bis.gov.in/standards/national-building-code/) — Fire and life safety - industrial occupancy

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Source: https://hagerstone.com/industries/automotive-and-engineering