Speed, and where its value actually sits

A shorter programme does not necessarily make a building cheaper to make. It makes it cheaper to own while it is being made. Every month under construction carries financing, insurance, site establishment, security and professional fees against a building that is not yet earning.

That cost has risen. On 23 September 2026 the Reserve Bank raised the repo rate to 7.25%, taking prime to 10.75%. Every month of programme now carries more interest than it did a year ago.

How much time does volumetric construction save? Singapore's Building and Construction Authority reports manpower and time savings of up to 40% on prefabricated prefinished volumetric construction (PPVC) projects. A 2019 McKinsey study found schedules 20% to 50% shorter where modular is done well. In our own pre-production comparison for a room of about 20 m², structural site time falls from roughly 16 days to roughly eight. That is an estimate, and we will measure it on our first projects before we publish it as a result.

When the structure is cast indoors, weather stops being a programme risk for that part of the building. Quality stops depending on which crew arrived. Sequencing on site becomes placement and connection rather than construction.

Most of the financial effect is in what does not occur: fewer weather delays, less rework, a shorter site establishment, less disruption to neighbours. None of that appears as a line item, which is why it is easy to leave out of a comparison. The costs avoided are invisible in a way the costs incurred never are.

The caveat matters. The same McKinsey research found that poorly executed modular projects can cost more, not less. Off-site construction moves risk into the factory. It only reduces it if the factory, the design freeze and the site interface are managed with discipline.

Waste is usually filed as an environmental issue, which lets it escape the cost conversation. It should not. Waste is material that was specified, bought, transported, stored, damaged and then paid for again to be taken away.

A factory reduces it at the source. Quantities are known before the pour because the module repeats, and permanent steel moulds replace timber formwork used and discarded job by job. Published research is more measured than marketing claims: a peer-reviewed analysis of 114 projects found prefabrication reduced construction waste by about 15%. We will measure our own waste from the first production run and publish it then.

Capital cost is what a building costs to put up. Whole-life cost is what it costs to keep. A reinforced-concrete room cast in one piece, with openings formed rather than cut and no wall-to-roof joint, removes some of the places where buildings commonly begin to fail.

For anyone holding an asset rather than selling it, that is often the most important consideration. A public programme, an employer or a long-term landlord is buying decades of service, not a handover. We will state a design life for our modules only once our structural engineer has confirmed it in writing.

None of the above is a quotation. What a specific scheme gains depends on its site, layout, storey count, finishes and programme. The honest answer to "what will it cost" is a priced proposal with assumptions and exclusions, not a figure on a web page. We do not claim that our modules cost less than conventional construction. Our case rests on programme, quality and certainty.

What the four mechanisms do tell you is where to look. If a comparison with conventional construction counts only the build cost, it measures the one place where industrialised construction has least to say, and misses the calendar, the risk, the materials and the decades that follow.

The lesson from elsewhere is a caution as well as a case. In the United Kingdom, several volumetric housing manufacturers failed in 2022 and 2023 after scaling ahead of their order books, and a parliamentary committee found cost claims in the sector that could not all be true. We intend to earn the case with evidence, one stage at a time.