Common Mistakes People Make When Buying Building Materials

Buying building materials sounds simple enough until you’re standing on site waiting for a delivery that should have arrived last week, or realising mid-project that you ordered three hundred bricks short. Small oversights at the buying stage have a habit of turning into big, expensive problems once the build is underway. 

The good news is that most of them follow a predictable pattern which means they are entirely avoidable with the right preparation.          

Why Do So Many People Order the Wrong Quantities?

Ordering too little brings a project to a standstill. Ordering too much wastes budget and leaves surplus materials that are difficult to return. Yet quantity errors remain one of the most consistent problems buyers face.

The fix starts with accurate measurement and a proper waste allowance. For most materials, adding a minimum of 10% on top of your calculated quantity covers cutting waste and breakages. For natural stone paving or complex pattern work, budget for 15% or more. 

Buildland’s material calculators take the guesswork out of this step entirely. A simple but genuinely useful tool before placing any order.

Is Choosing the Cheapest Option Always a Mistake?

Not always, but it frequently is. Selecting materials purely on price without considering quality, durability, and suitability for the application is a mistake that tends to be far more expensive in the long run. Materials that underperform in use lead to remedial work, early replacement, and in some cases structural issues that dwarf the original saving.

The better question when comparing prices is not which is cheapest, but which offers the best value over the lifetime of the build. A trusted supplier with a solid, well-specified product range will almost always serve a project better than the lowest headline price.

What Happens When You Do Not Check Material Compatibility?

Not all materials work well together, and assuming they do is a costly mistake. The wrong mortar type paired with certain bricks, aggregates that do not meet the structural specification, or paving products that are not frost-resistant for outdoor use — all of these cause problems that are difficult and expensive to address once work is underway.

Why does material compatibility matter on a build?

Before ordering, confirm that every material is appropriate for its specific application, considering load-bearing requirements, weather exposure, and compatibility with surrounding products. If there is any doubt, a specialist supplier will always be able to point you towards the right specification.

How do you check if a material is suitable for outdoor use?

Check the product specification for frost resistance and weathering ratings. Reputable suppliers list these clearly. If a product is not explicitly rated for external use, assume it is not.

Are Lead Times Something Buyers Frequently Overlook?

Yes, and it is one of the more disruptive mistakes on this list. Certain products, including special shaped bricks and natural stone, carry lead times significantly longer than standard materials. Failing to account for this when planning a build schedule can halt progress at the worst possible moment.

The practical solution is to identify your full material requirements early, check availability with your supplier before finalising the programme, and place orders with adequate lead time built in. Good project management works around material availability and not the other way around.

Does buying from too many different suppliers cause problems?

Frequently. Sourcing different materials from whichever supplier offers the lowest price on each individual product can create inconsistencies in specification, mismatched finishes, and the logistical headache of coordinating multiple deliveries. Working with a single, well-stocked supplier simplifies the process — one point of contact, consistent quality across products, and a relationship that makes resolving any issues far easier.

Buildland stocks a comprehensive range across building materials, garden and landscaping, heating and plumbing, timber and sheet materials, and tools and equipment — giving both tradespeople and homeowners a reliable single source for the majority of project requirements, from its branches in Redditch and Coventry.

Is delivery planning something buyers leave too late?

More often than it should be. Heavy materials including aggregates, bricks, paving slabs, and timber require careful thought around site access, vehicle size, and storage on arrival. Materials left in the wrong location or exposed to weather without adequate protection can be damaged before they are even used.

Think through delivery logistics before you order: confirm access routes, identify a safe storage area on site, and sequence deliveries to match the build programme rather than arriving all at once.

What should you check before a building materials delivery?

Confirm site access for the delivery vehicle, ensure adequate storage space is ready, and arrange for someone to be on site to receive and check the order on arrival. Report any damage or discrepancies to the supplier immediately, do not wait until the materials are needed.

Frequently Asked Questions (FAQs)

How much extra should I order to allow for waste? 

A minimum of 10% for most materials. For natural stone or complex cuts, budget 15% or more.

How do I know if a material is suitable for my application? 

Check the technical specification. If in doubt, ask your supplier before ordering — not after.

Can I return unused building materials? 

It depends on the supplier’s returns policy. Always check beforehand, and keep materials in original packaging to maximise your options.

Final Thoughts

Most building material buying mistakes come down to three things including insufficient planning, poor specification, and the wrong supplier relationship. Get those right and the majority of problems on this list simply do not happen.

Buildland is here to help you get it right from the start. Browse the full range online, use the material calculators to confirm your quantities, or visit the Redditch or Coventry branches to speak to the team directly before you order.