A trading company leases a B2 unit, puts pallet racking along one wall, and runs the rest as staff offices and a client meeting area. On paper it looks like a warehouse with an office. To URA, the question isn’t how the floor area is split, it’s what the business is actually doing on site, and a trading operation that receives, stores, and re-ships goods without any processing may not clear the bar for “industrial” use at all. That distinction, predominant use versus ancillary use, decides whether an approved-use or change-of-use application gets through.
This matters to anyone assembling a change-of-use submission, buying a unit with an existing but untested use declaration, or trying to work out whether their actual business activity qualifies as industrial before they sign a JTC or private industrial lease. Understanding the difference tells you what has to be true about your core operation for the unit to qualify, what ancillary space can and can’t do for you, and where JTC’s tenancy-level approved use and URA’s zoning-level classification pull apart.
Two Different Questions, Not One Ratio
It’s easy to read the 60:40 rule and assume predominant use and ancillary use are just two buckets on the same floor plan, with the only question being how big each bucket is. That’s the mechanical half of it. The half that trips up applications first is definitional: predominant use is a category test (is this activity industrial at all, under URA’s allowable-uses list for the zone), and ancillary use is a support test (does this space exist to serve an industrial activity that is genuinely happening on the same premises). Get the category test wrong and the 40% ceiling never becomes relevant, because the “predominant” activity itself doesn’t qualify.
URA’s B1 and B2 Allowable Uses guidelines list specific categories that count as predominant industrial use: manufacturing (light industries for B1, general and special industries for B2), food packing, printing and publishing, core media production requiring technical facilities, e-business (software development, telecommunications, data processing, with location conditions on call centres), industrial training, and warehousing tied to an industrial operation.[1][2] Ancillary use covers what supports that activity without being industrial itself: ancillary offices, meeting rooms, showrooms confined to the first storey, industrial canteens capped at 700 sqm or 5% of GFA, and a short list of commercial uses permitted only in outlying estates.[1][3]
Why Warehousing Is the Common Trap
Warehousing sits in an awkward spot. Pure storage-and-distribution, especially for a trading or e-commerce business that never processes the goods, reads to URA and JTC as closer to a logistics/distribution use than a manufacturing-linked activity, and JTC’s own guidance flags “the new usage includes warehousing or a significant increase in traffic generation” as a factor requiring closer review in a change-of-use application, precisely because pure warehousing has different traffic, loading, and zoning implications than production.[4] A business that stores, picks, and ships goods with no assembly, packing, or value-add step on site is far more likely to have its “industrial” classification questioned than one that manufactures or packs product on the same floor.
This is where the predominant-use test bites hardest for e-commerce and trading operators: the activity has to look like production, processing, or a listed allowable use, not simply “we keep our stock here.” If the actual operation is closer to third-party logistics or fulfilment, that’s a different use category with its own siting and traffic conditions, not an automatic fit inside a B1 or B2 unit’s industrial quantum.
Ancillary Office Is Not Independent Office
The reverse mistake shows up on the ancillary side. An ancillary office only qualifies as ancillary if it demonstrably supports an industrial operation happening in the same unit, staff coordinating production, managing inventory tied to on-site operations, handling technical or client work connected to what’s manufactured there. A standalone office function, sales team, corporate headquarters, or client-facing operation with no industrial activity behind it doesn’t become “ancillary” just because it sits inside a B1 or B2 shell. URA does not recognise an independent office as an ancillary use regardless of its floor area, which means the 40% cap doesn’t even apply to it; the use itself is the wrong category for industrial zoning.[3]
This is a separate failure mode from breaching the 40% ceiling. A unit can be well under the ancillary GFA cap and still fail, because the office isn’t ancillary to anything industrial in the first place.
Approved Use Sits at Two Levels
For JTC-leased or JTC-linked properties, there’s a second layer on top of URA’s zoning classification: JTC’s own approved use, set at the tenancy or building level. URA zoning determines what’s broadly permissible for the land; JTC’s approved use determines what a specific tenant is actually cleared to do in a specific unit. Both have to be satisfied. A tenant cannot rely on the URA zoning category alone to justify an activity if JTC’s approved use for that unit doesn’t cover it, and JTC change-of-use applications are separately assessed against the same predominant/ancillary distinction, plus site-specific factors like traffic generation, NEA clearances, and whether SCDF sign-off is needed for hazardous storage.[4]
| Layer | Set by | Governs |
|---|---|---|
| Zoning classification (B1, B2) | URA Master Plan | What categories of use are broadly allowed on the land |
| Use quantum (60:40 split) | URA Development Control | How much of the GFA can be predominant vs ancillary |
| Approved use | JTC (for JTC land/leases) or the building’s DC approval | What this specific tenant, in this specific unit, is cleared to do |
A unit’s URA zoning being B2 doesn’t automatically mean every B2-eligible activity is approved for that particular tenancy. If the current approved use on record is “light manufacturing” and the incoming tenant’s actual activity is distribution and repackaging, that’s a change-of-use trigger even though both fall under the same URA zone.
Practical Checks Before You Commit
- Describe the activity, not the floor plan. Before applying or signing, write down what physically happens on site day to day: production steps, processing, assembly, storage flows. Match that description against URA’s allowable-uses list for the zone, not against how much floor space each function occupies.
- Check the unit’s current approved use, not just its URA zoning, via the landlord’s JTC lease terms or a formal enquiry. A B2-zoned unit can carry an approved use narrower than “anything B2 permits.”
- Treat warehousing and trading activity as a flag, not a default fit. If the business is primarily receiving, storing, and shipping goods with minimal on-site processing, confirm with JTC or URA whether that specific activity clears the predominant-use bar before committing to the lease or purchase.
- Test the office function against the industrial activity, not the ceiling. If the office doesn’t support production happening in the same unit, it’s not ancillary regardless of size, and no amount of staying under 40% fixes that.
- For anything ambiguous, get it in writing. JTC’s own guidance on interim uses stresses that verbal assurances carry no standing in enforcement; a written query and written confirmation is the only reliable record if the classification is challenged later.
Takeaway
Predominant use and ancillary use aren’t two ends of a single percentage, they’re two different tests. The predominant activity has to fall inside URA’s allowable-uses list for the zone on its own merits before the 60:40 quantum is even relevant, and an ancillary space only counts as ancillary if it genuinely supports an industrial activity happening on the same premises. Warehousing and trading businesses face the sharpest version of this test because pure storage-and-ship activity sits closest to the line; office-heavy operations face it because an office attached to nothing industrial doesn’t qualify no matter how small. Confirm the activity classification and the unit’s specific approved use before assuming a floor-plan split settles the question.
For the mechanics of the 40% ceiling itself, see what ancillary use means for industrial property. For the broader zoning picture, B1 vs B2 in Singapore and URA/JTC change-of-use basics cover the process side, while how to describe your use correctly and the business activity fit guide walk through classifying specific business types.
References
[1] URA — Business 1 (Industrial): Allowable Uses. https://www.ura.gov.sg/guidelines/development-control/development-control-handbooks/non-residential/b1/allowable-uses/
[2] URA — Business 2 (Industrial). https://www.ura.gov.sg/guidelines/development-control/development-control-handbooks/non-residential/b2/
[3] URA — Business 2 (Industrial): Allowable Uses. https://www.ura.gov.sg/Corporate/Guidelines/Development-Control/Non-Residential/B2/Allowable-Uses
[4] JTC — Changing the use of your industrial property. https://www.jtc.gov.sg/get-help/managing-your-tenancy-or-lease/changing-the-use-of-your-industrial-property
[5] URA — Business 1 (Industrial): Use Quantum. https://www.ura.gov.sg/guidelines/development-control/development-control-handbooks/non-residential/b1/use-quantum/
[6] URA — Business 2 (Industrial): Use Quantum. https://www.ura.gov.sg/guidelines/development-control/development-control-handbooks/non-residential/b2/use-quantum/
[7] URA — Revised Guidelines for Supporting Uses in Industrial Developments (Circular DC14-24). https://www.ura.gov.sg/Corporate/Guidelines/Circulars/dc14-24