//What Does Cost Certainty Mean in Construction?

Cost certainty in construction refers to the predictability of total project costs, from design through to completion.

In a similar vein, time certainty refers to the predictability of the project timeline, including key milestones and overall completion dates.

Time and cost certainty are closely linked as delays can have an impact on costs. This is why they are top priorities for clients and contractors.

//Cost Risks in Construction

There are various factors which can impact cost certainty of construction projects including:

Poor Planning & Estimating

At the start of a construction project, the planning phase plays a significant role in confirming time and cost budgets. Without thorough preparation, opportunities may be overlooked and the parameters of the project may stretch during construction causing budgets to spiral. It’s also important to base any cost estimates on accurate and up-to-date information to avoid extra costs.

Material Volatility & Availability

Fluctuations in the price of key materials, such as bricks, tiles, timber and concrete, affect overall project cost predictability, especially if prices increase in between estimates and time of purchase. Late procurement, fragmented packages and material availability can result in price spikes that undermine cost certainty.

Labour Dependency & Skills Shortage

On-site construction relies heavily on skilled labour which is currently vulnerable to skills and supply shortages across the construction industry, and therefore cost fluctuation. Poor communication and coordination between trades can also cause disruption to project timelines and, therefore, introduce additional cost risk.

Environmental & Site-Related Challenges

Build programmes can be affected by weather conditions and ground inconsistency. Poor weather and unforeseen site issues can cause delays and often mean rework is required. Any extension to construction programmes ultimately leads to increased prelim costs, increased finance costs and delays in turning over capital.

//Cost Considerations Across Different Construction Methods

After identifying the risks, here’s a closer look at how different construction methods are affected.

Masonry Construction

Masonry construction is a well-established method of build, so its processes are widely understood and materials are typically available. However, it is highly reliant on manual labour and weather dependent which can significantly impact cost certainty. This is particularly true of larger or more complex projects and developments.

Steel Frame Construction

Steel frame systems are quick to construct due to its modular components, but this method also relies heavily on manual labour. Steel pricing can also be volatile which can introduce uncertainty if procurement or sequencing is not tightly controlled.

Modular Construction

Predictability is quite high for modular construction due to its factory-controlled quality and repeatability. This means project timelines can be optimised and with a choice of various materials, volatility can be avoided.

Considerations should be made regarding design flexibility and transport logistics as these are the main areas that could affect costs. With this being a niche form of construction, availability of suppliers also affects this too.

//Offsite Timber Frame Construction & Cost Certainty

Timber frame systems offer benefits in both cost and time certainty, so contractors and developers have peace of mind. As it is a well used form of construction, there are a wide range of suppliers, mitigating risk.

Factory-controlled offsite manufacturing ensures consistent accuracy and quality, so waste and rework are reduced and overrunning costs are avoided. This predictability extends to build programmes as timber frame structures can be erected within days, rather than weeks.

Speed shortens the project timeline, giving more surety on programmes and, therefore, cost budgets. Reducing time on site consquently reduces finance and prelim costs. It also removes other trades and materials from the critical path, giving more control and flexibility over these costs.

With a streamlined process of design, manufacture and delivery, materials are procured in the early stages of the project. This reduces exposure to last-minute price increases or material shortages which supports accurate cost forecasting. All of these factors contribute to smoother project delivery overall.