For all my projects I recommend the engagement of a cost consultant, otherwise known as a quantity surveyor. Cost consultants specialise in estimating construction costs in advance. Engaging a cost consultant is fundamental to effective cost management, particularly through the design and documentation stages of your projects. Cost consultant significantly decreases the likelihood of cost overruns that could lead to project delays and/or abortive documentation costs. It is highly recommended that the appointed cost consultant is
an independent and qualified estimator or quantity surveyor rather than a builder, project manager or other allied building industry party.
It must be remembered that estimates are not quotations or tenders; they are an option of the probable costs on the documentation provided at the time and of similar projects current at the time they are prepared. The more the project is development the more accurate the cost is.