Marble Lead Times and Schedule Risk in Large Projects

Stone is one of the few finishing packages where the critical path runs through a hole in the ground in another country. Steel can be rolled again. Tiles can be re-fired. A marble block that has been sold to somebody else cannot be recreated, and the substitute will not match what the consultant approved.

That single fact makes the marble programme different from the rest of the finishing schedule. This article sets out where the time actually goes, which legs of the chain a project team controls and which it does not, and how to build a contingency that works — rather than the float that gets absorbed in week two and was never real.

Where the time goes

Most programmes allocate a single bar called “marble supply” and place it a comfortable distance before installation. In practice the package is six sequential legs, four of which produce a document that gates the next one.

Leg	Indicative duration	Controlled by	Gate it produces
Selection and shortlisting	3–4 weeks	Project team	Approved material list
Slab viewing and sample approval	2–3 weeks	Project team	Approved sample record
Block reservation and order	1 week	Shared	Reserved lot reference
Cutting plan approval	1–2 weeks	Project team	Approved shop drawings
Fabrication	3–6 weeks	Supplier	Material ready for inspection
Inspection and shipping	2–6 weeks	External	Material on site

The durations are indicative averages for an imported project quantity. Local material compresses the last leg substantially. Bookmatching, large formats and heavy cut-out schedules extend fabrication.

Read the “controlled by” column carefully. Four of the six legs sit inside the project’s own gift, and they are the four most frequently late — because approvals queue behind other decisions while the programme assumes they happen instantly.

The three delays that actually happen

1. Approval latency, not supply delay

The most common cause of a late marble package is not the quarry. It is the gap between the supplier submitting slab photographs and the design team physically viewing and approving them. That gap is invisible in most programmes because no bar represents it.

Fix it by putting the approval itself on the programme as a dated activity with a named owner, not as an assumption.

2. Batch loss

A block viewed and admired but not reserved remains for sale. Between viewing and purchase order there is a window in which the material can be committed to another buyer, and on attractive stone that window is short. Reservation is not a commercial nicety; it is a schedule control.

3. Late scope growth

An additional area added to the stone scope after the batch is committed is a new procurement cycle, not a variation order. If the addition must match visually, either it comes from reserved attic stock or it restarts the chain.

The certification leg most programmes forget

Between fabrication and customs clearance sits a step that rarely appears on a bar chart. Dimension stone is a regulated product under the SASO Technical Regulation for Building Materials, Part 4, which requires a Certificate of Conformity from an approved notified body. Operationally that means a Product Certificate of Conformity for the material, then a Shipment Certificate of Conformity for each consignment, both handled through the SABER platform.

The schedule consequence is blunt: since SABER was integrated with the FASAH clearance platform, a shipment without a valid shipment certificate is not granted access to the market. Material sitting at a port accrues demurrage and blocks the installation zone behind it, and the fix is administrative rather than logistical — which means nobody on site can accelerate it.

Put the certification on the programme as its own activity, before the shipping leg, with a named owner. On a first order from a new supplier it is the product certificate that takes the time; on repeat consignments it is usually routine.

Building float that survives

Generic float gets consumed by whatever is loudest. Float that survives is attached to a specific risk and is defended by a named person.

• Quarry availability float — sits between shortlisting and reservation. Defends against the first-choice block being unavailable. Consumed by re-selecting, not by waiting.
• Approval float — sits around sample and cutting-plan approval. Defends against decision latency inside the project team.
• Shipping float — sits after inspection. Defends against port and customs variability. This is the one that should never be borrowed, because it is the one nobody can recover.

A practical rule: never place a hold point immediately before a leg you do not control. If the cutting-plan approval finishes the day fabrication must start, any approval delay is transmitted directly into the fabrication window — and fabrication is the leg where acceleration produces defects.

Phased delivery: the schedule tool most projects underuse

Delivering the whole quantity at once is convenient for the supplier and expensive for the project. It requires site storage nobody planned, exposes finished material to every trade still working, and concentrates all the inspection effort into one day.

Phasing delivery by installation zone solves three problems at once: storage, damage exposure, and cash flow. It also creates a feedback loop — problems found in phase one can be corrected before phases two and three are fabricated.

To phase successfully, three things must be in place before the first truck: an installation sequence agreed with the contractor, a numbered cutting plan that maps pieces to zones, and pallet marking that matches those zone numbers. Without the third, phased delivery becomes a warehouse-sorting exercise on site.

What to do when the programme has already slipped

When installation must start sooner than the material can arrive, there are only four honest options. Three of them are acceptable; the fourth is the one most often chosen.

1. Resequence installation so that zones with material available proceed first. Requires a cutting plan mapped to zones — another reason to have one.
2. Split the material strategy: keep the specified stone for the visible, high-value areas and use an approved alternative in back-of-house. Requires consultant approval and a defensible visual boundary.
3. Air-freight a partial quantity to unblock the critical zone. Expensive, but bounded — and often cheaper than a week of project delay.
4. Accept a different block. This is the option chosen under pressure and the one that produces a visible mismatch across a finished floor. The consequences are set out in when changing the marble type becomes a risky decision.

A schedule checklist for the stone package

1. Are sample approval and cutting-plan approval on the programme as dated activities with named owners?
2. Is block reservation a separate milestone from the purchase order?
3. Is the full quantity — including wastage and attic stock — committed in a single reservation?
4. Does the delivery programme break down by installation zone?
5. Does pallet marking match the zone numbering in the cutting plan?
6. Is there float after inspection, protected and not available for reallocation?
7. Is there a written contingency naming which areas may be re-sequenced?
8. Is site storage identified, covered, and adequate for the largest single phase?
9. Is SASO conformity certification a dated activity on the programme, with a named owner?

Frequently Asked Questions

How early should the marble package start relative to installation?

Work backwards from the installation date through all six legs rather than applying a rule of thumb. On an imported project quantity the chain commonly runs to several months once approvals are included honestly — and the approval legs, which the project controls, are usually the ones underestimated.

Can fabrication be accelerated if the programme slips?

Only within limits, and the limits matter. Cutting, calibrating, resin treatment and polishing each have curing and process times that do not compress safely. A supplier who agrees to halve the fabrication window is either not being straight about capacity or is planning to skip a step you will see later.

Is it safer to order early and store on site?

Ordering early is almost always right; storing on site frequently is not. Material stored on an active site is exposed to impact, staining and theft, and often sits in conditions nobody specified. Reserve the batch early, but have the supplier hold it and deliver in phases against the installation sequence.

How much float should sit after inspection?

Enough to absorb normal shipping and customs variability on the route being used, defended in writing so it is not reallocated to another package. The exact figure depends on origin and route; the discipline of never borrowing from it matters more than the number.

Also available in Arabic: الجدول الزمني للرخام ومخاطر التوريد

Related reading

• The Role of Early Planning in the Success of Marble Works
• Marble Procurement for Large Projects: From Purchase Order to Delivery
• How to Choose a Reliable Marble Supplier in Saudi Arabia
• Guide to Selecting Marble for Large-Scale Projects in Saudi Arabia

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