Every building is really two buildings sharing the same volume. One is the structure — the beams, columns and slabs that hold everything up. The other is the services: the air-conditioning ducts, the water and drainage pipes, the electrical trays and the fire lines that make the building usable. Both need the same ceiling space, the same shafts, the same slab, and neither can move once the concrete is set. Coordination is the work of deciding, on paper, who gets which space — before a single clash is cast permanently into a beam.
At SM Structural Consultants, recognised as one of the top structural consultants in Hyderabad, structural and MEP design are run side by side rather than one after the other. The reason is simple: a services clash discovered in a drawing is an eraser mark, and the same clash discovered on site is a broken beam, a lowered ceiling, or a duct that has to detour around a column for the life of the building.
Key Takeaways
- A building's structure and its services compete for the same ceiling, shaft and slab space.
- A clash on a drawing is an eraser mark; the same clash on site is a broken beam or a dropped ceiling.
- Openings through beams and slabs must be located and sized by the structural engineer, not cut on site.
- Ducts may only pass through the low-stress zone of a beam, never through the tension steel.
- Shafts, sleeves and inserts are all decided during design and cast in — never chased out later.
- Coordinated drawings save the two most expensive things on any site: time and rework.
You cannot drill a hole through a beam on site to fit a pipe. You reserve that hole in the design, or you move the pipe.Section 01
Why Two Designs Fight Over One Ceiling
Above every false ceiling is a crowded, invisible layer perhaps 400 to 600 mm deep. Into that same layer the structural engineer wants to put beams, the HVAC engineer wants to run air-conditioning ducts, the plumbing engineer wants drainage and water lines, the electrical engineer wants cable trays, and the fire consultant wants sprinkler mains. Every one of them, drawing alone, will happily use the full depth. Put the four drawings on top of each other and the conflicts appear instantly — a duct running exactly where a beam sits, a drain sloping straight into a column.
The structure always wins that fight, because it cannot move and it cannot be cut without weakening the building. So coordination is really the process of fitting the services around a structure that is fixed — and, where a service genuinely must pass through the structure, designing that passage safely into the concrete from the start.
Section 02The Clashes That Cost the Most
Most coordination problems fall into a handful of repeating patterns. Catching them on paper is routine; catching them on site is expensive.
Duct vs Beam
A large AC duct meets a beam and cannot pass — the ceiling drops, or the duct detours, eating headroom.
Drain vs Slab Level
A gravity drain needs slope, but the slab or beam soffit is in the way of the fall it requires.
Shaft Too Small
Risers and shafts sized before services were counted — pipes and cables simply do not fit inside.
Sleeve Missing
A pipe must cross a beam, but no opening was cast in — so it is cut on site, weakening the beam.
Insert Forgotten
Heavy equipment needs a cast-in support, discovered only after the slab has set hard.
Headroom Lost
Everything technically fits, but only by dropping the finished ceiling below a usable height.
Openings in Beams: The One Rule That Matters
Services do sometimes have to pass through a beam. That is allowed — but only where the structural engineer says, and only after the beam is designed for it. A beam carries load by pushing in compression at the top and pulling in tension along its bottom steel. Cut through that bottom steel and the beam is crippled. But there is a band near the mid-depth — the neutral axis — where stresses are low, and a modest, properly located opening there can be accommodated with extra reinforcement around it.
⚠ Never Cut an Opening On Site
A hole drilled or broken through a beam or slab after casting — to fit a pipe the drawings forgot — is one of the most damaging things that happens on a site. It severs reinforcement the engineer is counting on, and no one records it. Every opening through a structural member must be located, sized and reinforced by the structural engineer, in the design, and then cast in as a sleeve or box-out. If a service is discovered late, the answer is to reroute it — not to attack the concrete.
How Structure and MEP Are Coordinated
Coordination is a sequence, and it has to finish before the structural drawings are released for construction.
Fix the Structural Grid First
Columns, beams and slab levels are set — the fixed frame every service must work around.
Overlay Every Service Layer
HVAC, plumbing, electrical and fire drawings are superimposed on the structure to expose conflicts.
Resolve Clashes on Paper
Reroute a duct, resize a shaft, or agree an opening — while it still costs only a redraw.
Design the Openings That Remain
Any sleeve or box-out through a beam or slab is located and reinforced by the structural engineer.
Mark Sleeves & Inserts on Shop Drawings
Every cast-in opening and support is shown on the drawing the site actually builds from.
Freeze, Then Pour
Structural and MEP drawings are signed off together — only then is concrete cast.
Coordinated vs Uncoordinated: What Actually Changes
The same building, built two ways, ends up very differently — in cost, in ceiling height, and in how much of it was quietly damaged during construction.
| Aspect | Coordinated First | Left to the Site |
|---|---|---|
| Beam openings | Cast-in sleeves, reinforced by design | Broken through after casting, unrecorded |
| Ceiling height | Planned and protected | Dropped wherever a duct won't fit |
| Shafts | Sized for the real service count | Overcrowded; services rerouted awkwardly |
| Rework | Erasing lines on a drawing | Breaking and recasting concrete |
| Programme | Trades follow one agreed layout | Stop-start disputes over shared space |
None of this requires exotic tools — it requires the structural and services drawings to be laid over each other and argued out before the frame is built, by people who understand both. That single habit removes the great majority of the clashes that otherwise surface, one expensive surprise at a time, on site.
Related Reading
Coordination sits on top of the structural drawings and the frame beneath them — these cover both:
Frequently Asked Questions
Get your structure and services coordinated before the first pour.
Our structural and MEP teams work from one coordinated set of drawings — locating every sleeve, shaft and opening in the design, so nothing has to be cut into your concrete on site.