How much can poor warehouse control cost a construction firm?

For a mid-size firm with 5 active sites, uncontrolled warehouses lose €95,000-220,000 a year through over-ordering (€37,500-50,000), emergency purchases at premium prices (€12,500-37,500), theft and shrinkage (€25,000-75,000), double ordering (€7,500-20,000), and unused materials left over after the project is finished (€12,500-37,500).

How does material reservation prevent conflicts between sites?

A site manager allocates a quantity from a specific warehouse to their own project. Everyone else sees that it is committed: every stock line carries three numbers - total, reserved, and available. The system will not allow a reservation above the available quantity, and the check runs with a row lock, so two people cannot allocate the same quantity at the same moment. Only physically available stock can be reserved - a future delivery cannot be allocated in advance.

How are stock movements tracked?

Every receipt, issue, transfer, return, scrap, revision adjustment, and rental movement is documented with a date, a user, a note, and links to a site, a partner, a purchase order, a progress certificate, or an accounting document. A movement goes through draft, approval, and completion, and stock changes only on completion. That gives you an audit trail for every unit of material.

Can material consumption be linked to a project?

Yes, at site level. On the outgoing movement you pick the site, and on completion the system posts a consumption journal entry against it. There is no link down to an individual bill of quantities line - a stock movement attaches to a site, a progress certificate, or a document, not to a BOQ item. That is why the planned versus actual comparison in the budget analysis is fed by progress certificates and invoices, not by stock issues.

Construction Warehouse and Materials Management

Construction materials account for 50-60% of every project's cost. Concrete, rebar, bricks, insulation, electrical equipment, plumbing parts - the list is endless, and the sums are enormous. Yet most construction companies have no real visibility into what they have in stock, where it is, and how much is left. Materials get lost between sites. They get stolen, and nobody can prove how much was there to begin with. They get double-ordered because two people independently decide something is running low. They get bought at inflated prices on emergency runs because "we needed it yesterday." And after the project ends, tons of unused materials sit in an open yard, rusting away. The result: thousands of euros in losses that nobody tracks, because "that's just how construction works."

Construction Team has a dedicated Inventory Management section with eleven screens that gives you control from the moment a delivery arrives to the moment the last item goes into the structure.

Why Is Warehouse Management So Difficult in Construction?

Managing a warehouse in a manufacturing plant is relatively predictable: one warehouse, permanent staff, steady consumption. In construction, everything is different.

Multiple Sites = Multiple Warehouses

Every construction company works on several sites at once, and each site is effectively a separate warehouse. Materials arrive from different suppliers, to different addresses, on different schedules. The same material might be available at site A and missing at site B. Without a single system, it is impossible to see the whole picture.

Constant Movement Between Sites

Construction materials do not stay in one place. Today you have surplus rebar at the downtown project, tomorrow you need it urgently at the suburban one. Pallets of tiles arrive at the central warehouse but have to be split across three sites. Every movement has to be documented, or a month later nobody knows where anything went.

Weather and Storage Conditions

Construction storage areas are rarely enclosed buildings. Cement left in the open hardens. Timber soaks up moisture. Adhesives and waterproofing membranes have shelf lives. If you do not watch storage conditions, materials are ruined before they are ever used.

Theft Is a Real Problem

Construction sites are exposed: open areas, no permanent security, dozens of workers and subcontractors coming and going. Copper pipes, electrical cable, and power tools are the most common targets. Without accurate records of what was delivered and what was installed, theft stays invisible.

Bulk Materials Are Hard to Count

How do you measure how much sand you have? Or gravel? Or ready-mix concrete? Bulk materials cannot be counted by the piece - they are measured in tons or cubic meters, and the exact quantity in stock is always an approximation. That creates permanent uncertainty when you plan deliveries.

No Dedicated Warehouse Staff

In most construction companies, inventory is a side duty of the site manager. They are busy coordinating crews, checking quality, talking to the client, and somewhere in between all of that they are supposed to run the warehouse too. The result is predictable: notes go missing, deliveries are not documented, and the stock count is done "from memory."

The Cost of an Uncontrolled Warehouse

A lack of warehouse control is not just an organizational nuisance. It is a financial loss that compounds with every project. Here are the real scenarios we see with our clients:

Over-Ordering

The site manager orders 100 tons of rebar because "better to have it than to wait for it." The project actually needs 80 tons. The remaining 20 sit on site, rust, and six months later are only good for scrap. Loss: €7,500-10,000.

Emergency Purchases at Premium Prices

Friday, 4 PM. The crew reports the waterproofing membrane has run out and Monday is a write-off without it. The central warehouse is empty. You buy from the nearest merchant, at retail, at a price 30-40% higher than the rate agreed with your main supplier. Plus express delivery. Loss: €1,000-2,500 per incident.

Theft and Shrinkage

500 meters of electrical cable were delivered to the south wing site. The stock count shows 350 meters installed and 80 meters left in stock. Where are the other 70 meters? Nobody knows. Over a year, without controls, companies lose 2-5% of material value to theft and unrecorded shrinkage.

Double Ordering

The site manager on project A orders 200 sq.m. of sheet metal. The same day the office manager, who knows nothing about it, orders another 200 sq.m. "just in case." 400 sq.m. arrive. 220 are needed. The surplus 180 sq.m. sit unused.

Unused Materials After Project Completion

The project is finished. Pallets of tiles, bags of adhesive, plaster, and pipes are left on site. Nobody wants to arrange transport to another project. The materials stay there "temporarily" until they are thrown out or stolen.

Problem	Typical Loss Per Project	Annual Loss (5 Active Sites)
Over-ordering	€7,500-10,000	€37,500-50,000
Emergency purchases	€2,500-7,500	€12,500-37,500
Theft and shrinkage	€5,000-15,000	€25,000-75,000
Double ordering	€1,500-4,000	€7,500-20,000
Unused materials	€2,500-7,500	€12,500-37,500
Total	€19,000-44,000	€95,000-220,000

These numbers are not theoretical. They are a conservative estimate based on a typical mid-size construction project (residential building, 2,000-5,000 sq.m. gross floor area). On larger infrastructure projects the losses scale proportionally.

The Inventory Modules in Construction Team

The Inventory Management section has eleven screens: overview, warehouses, stock, serial items, batches, movements, reservations, production orders, revisions, utilisation, and settings. Four of them carry the everyday work.

Stock

Every stock record is one line for one item in one warehouse, tied to the company's nomenclature.

One materials database - every item has a unique code, a name, and a unit of measure. The code is unique within the company, so the same thing cannot be entered twice under the same code
Stock per warehouse - you see how much of an item sits in each warehouse separately, not only the total, together with its value
Total, reserved, available - the three numbers sit side by side on every line. Available is the difference, and it is what the system checks any allocation against
Minimum stock levels - set a minimum quantity on the item in the nomenclature. When stock falls below the threshold, the system sends a notification to the warehouse's responsible person, in the app and by email. The check runs once a day, so the alert arrives the next morning rather than at the moment of the issue
Batches with expiry dates - for materials where shelf life matters: adhesives, chemicals, admixtures. The system warns you as the expiry date approaches
Serial items - expensive equipment gets its own screen, with the handover history of who passed the unit to whom, a warranty period with an automatic notification when it runs out, and service dates

Warehouses

Every physical warehouse - central, office, or on site - has its own profile in the system.

Multiple warehouses - create one for every site, for the head office, for every staging area. No limit on the number
Responsible persons - every warehouse has an assigned owner. That is also the person who receives the low-stock alerts
Address and notes - so it is clear where a given material is kept when you run many sites
Link to a site - a warehouse is associated with a site and shows up in that site's "Warehouses" tab. Careful: project cost is attached to the site picked on the movement itself, it is not inherited from the warehouse
Negative stock - for each warehouse you decide whether issuing below zero is allowed. It is off by default, which stops you from issuing something that on paper is not there

Warehouse Movements

Every receipt, issue, or transfer is documented as a warehouse movement with full traceability. There are nine types: receipt, issue, transfer, scrap, adjustment up, adjustment down, return to vendor, rental out, and rental return.

Incoming deliveries - register the delivery with a date, a supplier, line items, and an external reference (the delivery note number). The reference is a text field, not an attached file
Outgoing movements - materials that go into the works. You link the movement to a site, and where relevant to a progress certificate, a purchase order, or an accounting document
Transfers between warehouses - the system decreases stock at the source and increases it at the destination
Returns and scrap - you document the reason. Scrap requires approval by default before it leaves stock
Three states - a movement is created as a draft, goes through approval, and is then completed. Stock changes only on completion, so a draft moves nothing
Full history - every movement carries a date, who created it, who approved it, who completed it, the note, and the document links

Reservations

Reservations solve one of the most common problems: resource conflicts between sites.

Allocate to a specific project - from a given warehouse you set aside a quantity for your own site, with an expected date and a validity period
A hard block on over-reservation - the system will not let you allocate more than the available quantity. The check runs with a row lock inside the transaction, so two site managers cannot allocate the same quantity at the same moment. If a warehouse holds 50 tons of rebar and 40 are reserved, the next person sees 10 available and cannot ask for more
Physically available stock only - you reserve what is already in the warehouse. A future delivery cannot be allocated in advance
Closed with a button - when the material heads for the site, the reservation is closed manually from its own screen. The warehouse movement does not close it: these are two separate actions, and the second one is easy to forget. A reservation past its validity is released automatically

A Real Process: From Delivery to Installation

Theory matters, but let us follow a concrete scenario step by step, so you can see how the modules work together and where you need to pay attention.

Step 1: The Delivery Arrives

Supplier Northgate Steel delivers 30 tons of Ø12 rebar to the central warehouse. The warehouse keeper creates an incoming movement:

Warehouse: "Central Warehouse - Eastfield"
Item: "Rebar Ø12 B500B"
Quantity: 30,000 kg
External reference: delivery note #4521
Completes the movement, and only now does stock go up

If the delivery has already been entered as an invoice with a warehouse on it, the incoming movement is created on its own and there is nothing to do by hand.

Step 2: The Site Manager Makes a Reservation

The site manager on the "Riverside Residences" project knows that reinforcement of the third-floor slab starts next week. The bill of quantities calls for 12 tons of Ø12 rebar. They create a reservation:

Warehouse: "Central Warehouse - Eastfield"
Item: "Rebar Ø12 B500B"
Quantity: 12,000 kg
For project: "Riverside Residences"
Expected date: April 14, 2026

The system shows: 30,000 kg total in stock, 12,000 kg reserved, 18,000 kg available. The manager on "Parkview Tower" can see they cannot count on the full 30 tons, and the system will not let them ask for it.

Step 3: The Materials Are Transferred to Site

On April 14 the rebar is loaded and sent to the Riverside site. The logistics coordinator creates a transfer movement:

From warehouse: "Central Warehouse - Eastfield"
To warehouse: "Riverside Residences - Site Store"
Item and quantity: Rebar Ø12, 12,000 kg
External reference: consignment note #0891

On completion, stock at Eastfield drops by 12,000 kg and stock at Riverside goes up.

This is the step people skip most often: the reservation stays open. Somebody has to go in and close it. Make a habit of it and the "available" number stays true; forget it and 12 tons sit allocated in a warehouse they left long ago.

Step 4: The Materials Are Installed

The reinforcement crew places the rebar in the slab. The site manager creates an outgoing movement:

From warehouse: "Riverside Residences - Site Store"
Item and quantity: Rebar Ø12, 11,800 kg (actually installed)
Site: "Riverside Residences"
Note: "Installed per design, 200 kg remainder on site"

Stock at the site store drops to 200 kg. On completion the system posts a consumption journal entry against the chosen site.

The site is a field on the movement itself and is not inherited from the warehouse. Miss it, and the issue is left with no project analytics at all.

Step 5: Reporting and Analysis

At the end of the month, management opens the item's screen and sees:

Total Ø12 rebar delivered: 30,000 kg
Installed on sites: 11,800 kg (Riverside) + 8,200 kg (Parkview) = 20,000 kg
In warehouses: 10,000 kg (Eastfield) + 200 kg (Riverside)
Reserved: 6,000 kg (for "Eastgate", next week)
Available: 4,200 kg

Traceability along the whole chain, from the supplier, through the warehouses, to the site. No guessing, no handwritten notes, no "I think there was some somewhere."

Stock Counts: How to Run a Revision Without Chaos

Periodic stock counting is mandatory, and in construction it is especially painful. Materials are spread across sites, bulk quantities are approximate, and the people who have to count have ten other jobs to do.

Planning the Revision

You create a revision for a specific warehouse with a planned date and choose the scope: full, partial on selected items, or cyclic. The schedule stays your responsibility - the system does not generate the next revision by itself and does not send reminders.

There is something more useful, though: blind counting. Turn it on and the counter does not see the system quantities, so there is no way to nudge the result toward what was expected.

Expected vs. Actual Quantities

When the revision starts, the system generates the list of expected stock from all completed movements and records the unit cost of every line. The responsible person enters the counted quantities, and the system works out the difference and its value on the spot.

Investigating Discrepancies

Every line with a discrepancy is marked as a shortage or a surplus, and a summary sits above the list: how many lines match, how many are shortages, how many are surpluses, and the total value of the difference. Typical causes:

Natural loss - spillage, breakage in transport (normal for bulk and fragile materials)
Documentation errors - a delivery that was never entered, or a movement that was left as a draft
Theft - when shortages of particular materials recur systematically (cable, copper pipe, power tools)
Storage damage - cement hardened by moisture, adhesive past its shelf life, corroded rebar

Serial items are tracked more strictly: each unit gets a status - pending check, found, missing, or unexpected - and the discrepancy is closed with a decision and a note.

Write-Offs with Documentation

When materials are unusable, a scrap movement is created with a stated reason and quantity. By default, scrap goes through approval. Who created it, who approved it, and who completed it is visible in the movement's history.

On completion the system posts a scrap journal entry with site analytics. Bear in mind that the project budget analysis does not read warehouse movements: it is fed by progress certificates and invoices, so scrapped value shows up in the accounting rather than as a line in the project's budget.

Closing the Revision

Once counting is done, the differences turn into adjustments up and down, separate movements that bring system stock in line with reality. From there the numbers are true again, and every following revision starts from a clean base.

Integration with the Other Modules

Warehouse management does not exist for its own sake - its value comes from the links to the other modules. What matters is knowing which of those links are automatic and which need your action.

Supplier Invoices and Stock Movements

This link is the strongest one, and it works on its own. When you enter a supplier invoice and name a warehouse, the system creates the incoming movement automatically, completes it, and raises stock. If the document is cancelled or changed, a reversing movement is created.

In other words, deliveries are never entered twice: accounting and the warehouse start from the same record.

Materials and Project Cost

On an outgoing movement you pick the site. On completion the system posts a consumption journal entry against it, and that is the route by which issued material becomes cost.

The site, however, is a field on the movement, not on the warehouse. A warehouse tied to a site shows up in that site's "Warehouses" tab, but it does not fill in the site on the movement for you. This is the most common omission in practice.

Planned vs. Actual

The project's budget analysis compares by bill of quantities line and by material group: planned, contracted, actual, and direct cost, with variance and percentage.

Be clear about where those numbers come from: "actual" is collected from progress certificates and invoices, not from warehouse issues. A stock movement attaches to a site, a progress certificate, or a document, but never to a BOQ line. So the 11,800 kg issued do not land in the reinforcement line by themselves - they land there once the quantity is certified or invoiced.

Material Groups: Plan vs. Actual

If your nomenclature groups are named sensibly, the "Groups" tab in the budget analysis gives you exactly this picture:

Material Group	Per BOQ	Actual	Variance
Rebar	€92,000	€88,000	-4.4%
Concrete	€48,500	€50,300	+3.7%
Bricks and masonry	€21,500	€20,300	-5.2%
Electrical materials	€34,700	€37,900	+9.1%
Total materials	€196,700	€196,500	-0.1%

This report shows you where the money leaks while the project is still running, instead of finding out at final close-out, when it is too late to react.

Construction Cost Control - How to Keep Your Project on Budget - how progress certificates and invoices build the real picture of project costs
What Is Construction Team and How It Helps Construction Companies - a full overview of every module on the platform, inventory included
10 Problems in Construction Project Management - why the lack of warehouse control is one of the ten most common problems

Construction Team gives you visibility over every material, from the supplier to the site. If you would like to see how the warehouse modules work with real data from your business, contact us for a demonstration.