The most common mistakes when quoting a job (and how to avoid them)

Many professionals learn to quote through mistakes repeated over time. Knowing the most common ones in advance avoids making them and losing money in the process.

Forgetting small items

Screws and fixings, adhesives, site protection, waste management: they are individually small items that, added together, can represent a relevant percentage of the real cost, and they are often forgotten because they don't seem "the important work".

Not including a contingency margin

Quoting down to the last cent, with no margin for unexpected findings, leaves the professional without a cushion when any surprise appears on site, forcing them to absorb the extra cost or have an uncomfortable conversation with the client.

Calculating time optimistically

Estimating the execution time thinking of the best possible scenario, without counting interruptions, material waits or less productive days, leads to missed deadlines that damage reputation, even if the work itself is well done.

Not updating reference prices

Continuing to use the same material or labour prices for years without reviewing them periodically makes margins shrink little by little without the professional noticing, until the business stops being profitable.

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