You Still Need to Pay a Million No Matter How You Save

 𝘋𝘰𝘭𝘭𝘢𝘳𝘴 𝘢𝘯𝘥 𝘊𝘦𝘯𝘵𝘴 𝘈𝘳𝘦 𝘕𝘰𝘵 𝘚𝘰𝘭𝘦𝘭𝘺 𝘈𝘣𝘰𝘶𝘵 𝘊𝘰𝘯𝘤𝘳𝘦𝘵𝘦 𝘢𝘯𝘥 𝘉𝘢𝘳𝘴

The less you buy, the less it costs.

This concept does not necessarily work when it comes to economical structural design.

Structural economy is often mistaken for using less concrete, less reinforcement or smaller members. However, a framing system can look highly optimised on paper and still cost more to build.

 

𝘌𝘯𝘨𝘪𝘯𝘦𝘦𝘳𝘴 𝘓𝘪𝘬𝘦 𝘊𝘰𝘱𝘺-𝘗𝘢𝘴𝘵𝘦

Imagine two buildings.

The first one has overly optimised members. Columns look highly optimised as we go from the top to the ground. All beams are customised based on loading. Inside, reinforcement is optimised accordingly. Material usage is minimised wherever possible.

The second one has regular grids and similar spans. Columns barely change for a good number of floors. Beams have similar sizes and reinforcement, seemingly disregarding the differences in loading above.

Minimising materials does not guarantee easier site work.

The second framing design may look like a product of “lazy” copy-paste work. But repetition allows workers to become familiar with the sequence, formwork to be reused efficiently, and mistakes to be reduced.

Sometimes, repeating yesterday’s solution is more economical than optimising today’s.

 

𝘛𝘪𝘮𝘦 𝘐𝘴 𝘔𝘰𝘯𝘦𝘺 𝘛𝘰𝘰

Back to the first framing option, where everything is over-optimised.

The cost saved in materials may simply reappear in the form of time.

Workers cannot develop the same working rhythm when the arrangement keeps changing from one floor to another. Their experience from previous floors becomes less transferable.

How about the engineers who design it?

First, we need more time to dive deep into individual members and customise their details. More unique details also mean more drawings, more coordination and more opportunities for inconsistencies.

Worst case: what happens when an architectural change comes in?

An overly optimised design may have limited buffer to accommodate changes. What started as a small revision can trigger redesign, repeated detailing work and another round of coordination.

 

The cheapest member does not necessarily create the cheapest building.

Structural economy is not simply about squeezing every kg of steel or cubic metre of concrete out of the design. It is about finding the balance between material efficiency, repetition, construction speed and adaptability.

 

𝘐𝘯𝘵𝘦𝘨𝘳𝘢𝘵𝘦 𝘒𝘯𝘰𝘸𝘭𝘦𝘥𝘨𝘦 𝘪𝘯𝘵𝘰 𝘠𝘰𝘶𝘳 𝘗𝘳𝘰𝘧𝘦𝘴𝘴𝘪𝘰𝘯𝘢𝘭 𝘞𝘰𝘳𝘬𝘧𝘭𝘰𝘸

Our Engineer’s Cheat Sheet – Economy of Structural Framing compresses the key cost drivers, repetition principles, transfer penalties and fast-floor considerations into a one-page reference for practical design review.