We've coordinated over 200 BCA submissions for mezzanines, outdoor shelters, and PE-stamped racking projects across Singapore warehouses and factories. The single most common question we hear at site survey is: "Do we need full Building Plan submission, or can we just notify?" The answer matters — because getting it wrong can add three to six months to your timeline, or worse, leave you with an unauthorised structure you're forced to dismantle.

Here's what we've learned handling these submissions in-house, working with PEs, and walking projects through both lanes.

What's the Actual Difference Between Building Plan Submission and Simple Notification?

Building Plan (BP) submission is the full regulatory process. You engage a Qualified Person (typically a Professional Engineer or Registered Architect), prepare structural drawings, calculations, and compliance documentation, submit to BCA, wait for review, address comments, get approval, then proceed with works. Timeline: typically 8 to 16 weeks depending on complexity and whether SCDF, NEA, or other agencies need to be looped in.

Simple Notification is a streamlined declaration for minor works that meet pre-defined thresholds. You still need a QP to endorse, but there's no plan review — you notify BCA of the scope, confirm compliance with the Building Control Act and Regulations, then proceed. Timeline: often same-day or within a few working days, assuming documentation is in order.

The key: Simple Notification is not "no approval." It's a fast-track lane for low-risk works. You're still accountable. If the work doesn't actually qualify, BCA can halt the project and require retrospective BP submission.

When Does a Warehouse Mezzanine Require Full Building Plan Submission?

We fabricate and install mezzanine floors for 3PL operators, e-commerce warehouses, and factory storage expansion. In our experience, most mezzanines do require full BP submission, because they involve adding new floor area or altering the building's structural load path.

You'll typically need BP submission if:

• The mezzanine floor area exceeds the Simple Notification threshold. The exact threshold depends on the building's use class and whether the mezzanine is habitable or purely storage. We always confirm this with the PE before quoting.
• You're creating new enclosed space or changing the use of the floor. For example, converting open warehouse space into an office mezzanine, or adding partitions and air-conditioning.
• The mezzanine is supported by new columns or posts that transfer load to the slab. If your mezzanine isn't fully self-supporting within the existing building envelope, the structural PE will usually flag it for BP submission.
• The slab beneath wasn't originally designed for the additional load. This is common in older warehouses. Even if the mezzanine footprint is small, if the slab can't handle the imposed load without strengthening, you're into structural alteration territory — and that's BP.

We've had clients assume that because a mezzanine is "just racking with a deck on top," it's exempt. That's rarely true. The moment you're creating a new working level with guardrails, stairs, and rated load capacity, BCA treats it as a structural addition.

When Can You Use Simple Notification Instead?

Simple Notification works for defined minor works. In the warehouse and industrial context, we've successfully used it for:

• Small outdoor shelters and canopies below a certain floor area and height, not encroaching on setback or common property, and not requiring new foundations beyond a certain depth.
• Internal non-structural partitions — for example, mesh partitions for secured storage zones within an existing warehouse, where no new load is added to the slab and no fire compartmentation is affected.
• Minor racking reconfiguration where the racking system was already PE-certified and you're simply re-spacing or adding a bay within the original load parameters. (If you're increasing height, load, or seismic bracing requirements, that's a different conversation.)

The critical qualifier: the work must fall within BCA's published list of minor works, and it must not trigger other agency approvals (SCDF for fire safety, NEA for trade effluent or ventilation, LTA for vehicle access, etc.).

If you're in doubt, we always recommend engaging the PE early. A 30-minute consultation can save you months of rework.

What Happens If You Pick the Wrong Lane?

We've been called in to rectify projects where the contractor assumed notification was enough, only to have BCA issue a stop-work during inspection.

If you proceed with notification when you actually needed BP submission, BCA can:

• Issue a stop-work order
• Require you to submit retrospective BP, often with penalty fees
• In serious cases, order demolition or reinstatement if the structure doesn't meet Code requirements

If you proceed with full BP submission when notification would have sufficed, the only penalty is time and cost — but that's still 8 to 16 weeks you didn't need to wait, and professional fees you didn't need to pay.

This is why we always coordinate the submission pathway with the PE before fabrication begins. We've built the mezzanine, shelter, or racking layout to match the approved drawings — not the other way around.

How We Handle Submissions for Our Mezzanine and Shelter Projects

When a client engages us for a mezzanine or outdoor shelter, we walk them through the submission requirement during site survey — before we quote.

Here's our standard process:

1. Site survey and load assessment. We measure the space, check the existing slab capacity (sometimes via coring or original structural drawings), confirm the intended use (storage, workspace, office), and document the forklift access, fire exits, and any constraints.
2. Engage the PE. We work with a panel of Professional Engineers who specialise in industrial structures. They determine whether BP or notification applies, and what supporting documents are needed (calculations, mill certs, foundation details, etc.).
3. Prepare drawings and documentation. We provide fabrication drawings, material specs, and load case assumptions. The PE prepares the submission set.
4. Submit and track. We coordinate submission to BCA (and SCDF if required), track the review, respond to queries, and keep the client updated.
5. Fabricate and install post-approval. We don't start cutting steel until we have the approved plan or notification acknowledgment in hand.
6. TOP and handover. Once installation is complete, the PE inspects, and we coordinate Temporary Occupation Permit (TOP) or Declaration of Completion, depending on scope.

We've had clients ask why we can't "just build it and submit later." The answer is simple: if BCA requires changes during review, we may need to alter the design — and that's far cheaper to do on paper than after steel is already welded and erected.

Common Grey Areas We See in Warehouse Projects

There are a few situations where even experienced contractors and PEs need to double-check the threshold. Here's what we've encountered:

Racking That's Also a Mezzanine

Some of our clients want a two-tier racking system where the upper level is accessible by catwalk for manual picking. Is that racking, or is it a mezzanine?

If people are working on the upper level for extended periods, if there's a deck, guardrails, and stairs, BCA typically treats it as a mezzanine — and that usually means BP submission. We've PE-stamped these as elevated platforms within a racking system, but the PE still needs to confirm whether notification suffices based on total deck area and use.

Outdoor Shelters on Existing Hardstand

You'd think a simple rain shelter over your loading bay is straightforward. But if the shelter exceeds the minor works threshold for area, or if it's close to the site boundary and affects setback, or if the columns require new foundation work, it can tip into BP territory.

We've submitted dozens of these. The safe assumption: if the shelter is larger than a car porch and involves any new foundation or structural connection to the building, budget for BP submission.

Replacing an Existing Mezzanine

If you're tearing out an old mezzanine and building a new one in the same footprint, do you need fresh BP submission?

Usually, yes — especially if the original mezzanine was built before current Code requirements, or if you're changing the load rating, material, or layout. The old approval doesn't automatically carry over. We've had to submit "replacement mezzanine" plans where the client assumed it was a like-for-like swap, but the load case and bracing had changed.

Why We Never Skip This Step

We started Wong Lye in 2011 as a logistics business. We built our own warehouse racks in 2014 because we couldn't find a contractor we trusted to do it properly. Clients saw the work, asked us to build theirs, and a decade later we've served over 1,500 commercial and industrial customers.

Racking and mezzanines aren't just products you order from a catalogue. They're engineered structures that live in a regulated environment. We've spent two decades fixing other people's mistakes — racks that were never load-tested, mezzanines built without PE sign-off, shelters erected without checking setback or foundation depth.

The submission pathway — BP or notification — isn't red tape. It's the filter that ensures your structure is safe, compliant, and won't come back to haunt you during a factory audit, lease renewal, or resale.

We do the slow work first: survey, load calc, PE engagement, submission. Then we fabricate in-house in Singapore, install to the approved drawings, and hand over a structure you can operate with confidence.

Frequently Asked Questions

Can I start building while the BP submission is under review?

No. You must wait for BCA approval before commencing structural works. We've seen contractors pour foundations or erect columns "to save time," only to have BCA require changes that make the early work unusable. We fabricate long-lead items like beams and uprights during the review period, but we don't install until the approval is in hand.

If I use Simple Notification, do I still need a PE?

Yes. Simple Notification still requires a QP (Qualified Person) — typically a PE or architect — to endorse the notification and confirm that the works comply with the Building Control Act and Regulations. It's not a DIY process. We coordinate this with our panel of PEs as part of the project.

How long does BP submission take for a typical warehouse mezzanine?

In our experience, 8 to 16 weeks from submission to approval, depending on complexity and whether other agencies (SCDF, NEA) are involved. If the PE's drawings are complete and the project is straightforward, we've seen approvals in as little as 6 weeks. If there are site constraints, mixed-use elements, or fire safety triggers, it can stretch to 20 weeks. We build buffer into the project timeline and keep clients updated throughout.

What happens if my mezzanine was built years ago without submission?

We've encountered this often — especially in older industrial buildings where record-keeping was patchy. If you're discovered during a BCA inspection, or if you're selling or refinancing and the bank's surveyor flags it, you may be required to submit retrospective BP and obtain a Certificate of Statutory Completion (CSC). In some cases, if the structure doesn't meet current Code, you'll need to strengthen or modify it. We can help coordinate the PE, drawings, and submission, but it's always more expensive and time-consuming than doing it right from the start.

Do I need separate submissions for racking and for the mezzanine?

It depends on the system. If the mezzanine is a standalone structure with its own columns and beams, that's one submission. If you're also installing PE-stamped selective racking elsewhere in the warehouse, that's typically a separate set of calculations and load certs, though they can sometimes be bundled in the same BP if the PE scopes it that way. We coordinate this during design so you're not surprised by duplicate fees or timelines.

If you're planning a mezzanine, outdoor shelter, or heavy-duty racking install and you're not sure whether you need BP submission or notification, talk to us early. We'll walk the site, clarify the pathway, and coordinate the PE engagement so your project stays on schedule and fully compliant. Reach out via WhatsApp at +65 9107 2601 and we'll take it from there.