The pressure to begin a construction project can build quickly. Clients may want work to start by a particular date, while contractors may be keen to secure the job and keep their pipeline moving. However, starting quickly does not always mean finishing quickly. When pricing and pre-construction preparation are rushed, important details can be missed. Builders may be asked to quote from incomplete drawings, unclear specifications or loosely defined scopes of work. Estimates may be prepared without enough time to check quantities, confirm supplier prices or understand the practical requirements of the site. These gaps can lead to unsuitable quotations, missed costs, disagreements and reduced profit margins. Taking enough time to prepare reliable pricing and tender information can therefore prevent much larger delays and expenses later
Why pressure to start quickly can create bigger delays later
A fast start can make a project appear to be progressing efficiently. In reality, unanswered questions may have been carried into the construction phase.
Once work begins, these questions become more difficult and expensive to resolve.
A missing design detail may prevent a trade from continuing. An unspecified product may have a longer lead time than expected. A structural issue could require revised drawings, while an unclear item in the quotation may lead to disagreement over whether the work was included.
This can result in:
- Requests for additional information
- Delayed material orders
- Changes to subcontractor bookings
- Work being paused or completed out of sequence
- Revised quotations
- Disputes over additional costs
- Extensions to the construction programme
Time spent clarifying the project before construction begins is not necessarily a delay. It often allows the work to move forward more smoothly once the contractor is on site.
Incomplete drawings lead to pricing assumptions
Drawings are one of the main sources of information used when preparing a construction estimate. They help the estimator understand the dimensions, layout, materials and construction details required.
When drawings are incomplete, contractors must either request further information or make assumptions.
For example, plans may show a proposed extension but include limited information about:
- Foundation requirements
- Structural steelwork
- Drainage alterations
- Roof construction
- Insulation
- Internal finishes
- Mechanical and electrical work
- Windows and doors
An estimator may include reasonable allowances, but an allowance is not the same as a confirmed cost.
One builder may assume a basic specification, while another allows for a more expensive product. One may include an item that another contractor believes is excluded. The returned quotes can then vary significantly, even though each builder has received the same drawings.
The problem may not be that one price is incorrect. The contractors could simply be pricing different interpretations of an incomplete design.
Assumptions and exclusions should always be stated clearly. Wherever possible, however, missing information should be resolved before the project is issued for pricing.
Rushed estimates increase the risk of missed costs
A reliable estimate involves more than adding prices to the most visible items shown on a drawing.
The estimator must consider quantities, labour, materials, plant, subcontractors and the wider costs of delivering the project. The estimate should then be checked for possible omissions or inconsistencies.
When there is not enough time to complete this process, costs can be missed.
Common examples include:
- Waste removal and skips
- Scaffolding
- Plant and equipment hire
- Temporary protection
- Deliveries
- Specialist subcontractors
- Testing and certification
- Site setup
- Small tools and consumables
- Making good
- Final cleaning
Some of these items may appear relatively small. Across a full project, however, they can remove a significant amount from the contractor’s expected profit.
A rushed estimate may also rely too heavily on prices from previous jobs. Material costs, supplier rates and subcontractor availability can change, meaning an older figure may no longer reflect the likely cost of completing the new project.
Producing a professional construction estimate gives the estimator time to review each work section systematically and build the price around the specific project information.
An unclear scope makes quotes difficult to compare
Clients often ask several builders to quote so they can compare prices. However, a fair comparison is only possible when each contractor has been asked to price the same work.
When the scope is unclear, quotations may be structured differently.
One contractor may include decorating, waste disposal and floor finishes, while another lists them as exclusions. One builder may allow for premium fittings, while another assumes a basic specification.
Looking only at the total could make the lowest quotation appear to offer the best value. Once the exclusions and assumptions are reviewed, it may become clear that the cheaper quote covers less work.A clear scope should explain:
- What work is included
- What work is excluded
- Who will supply key materials
- The required specification
- Which items will be supplied by the client
- Any design responsibilities
- Required testing and certification
- Any provisional or undefined work
A detailed schedule of works can organise the project into clear sections so each contractor prices the same requirements.
For projects that require measured quantities, a bill of quantities can provide a more detailed pricing document. Contractors can apply their rates to a consistent list of items, making the returned tenders easier to compare.
Missing preliminaries can damage contractor profit
Preliminaries are the costs associated with setting up, managing and operating the site rather than completing one permanent part of the building.
They may include:
- Site supervision
- Welfare facilities
- Temporary fencing
- Security
- Scaffolding and access equipment
- Temporary services
- Health and safety requirements
- Cleaning and waste management
- Site administration
- Deliveries and storage
These costs can be overlooked because they are not always shown clearly on architectural drawings.
They are also affected by the length and complexity of the project. A job lasting 12 weeks will have different supervision, welfare and equipment costs from one lasting 24 weeks.
If the programme has been underestimated, the builder may need to maintain these arrangements for longer than expected. Unless the additional time can be recovered from the client, the contractor may have to absorb the cost.
An estimate can therefore include accurate quantities for the physical building work and still be commercially unsuitable because the wider cost of running the project has not been fully considered.
Late design changes increase construction costs
Design changes are generally easier and less expensive to manage before work begins.
During pre-construction, a revised layout or product choice may only require changes to drawings, quantities and the expected budget. Once construction has started, the same decision may affect work that has already been ordered, scheduled or completed.
Late changes can lead to:
- Abortive work
- Restocking charges
- Cancelled orders
- Revised structural calculations
- New subcontractor quotations
- Extended equipment hire
- Additional labour
- Disruption to the programme
For example, changing a window specification before quotations are requested may require the tender documents to be updated. Changing it after the openings have been formed and the original windows ordered could affect the structure, procurement and installation programme.
A construction cost plan can help clients understand the likely financial impact of design choices before they commit to them. It can then be updated as the project develops.
This does not mean every detail must be finalised immediately. It means the project team should understand which decisions remain outstanding and how they could affect the cost.
Poor tender documents create avoidable disputes
Tender documents should give contractors a clear understanding of what they are expected to price.
A tender package may include drawings, specifications, schedules, quantities and instructions. These documents should work together to describe the proposed work consistently.
Poor tender information can create uncertainty over:
- Which drawings were used for pricing
- Which document takes priority
- Whether an item was included
- What specification was required
- Whether a figure was fixed or provisional
- Who was responsible for part of the design
- Whether later work is a variation
These issues often remain hidden until the relevant stage is reached on site.
The client may believe an item was included because it appeared on a drawing. The builder may argue that it was excluded because it was not included in the schedule or specification.
Well-prepared tender documents reduce this risk by providing a clearer record of what was priced and agreed.
Why builders need enough time to price work accurately
Builders are often given short quotation deadlines, particularly when a client is eager to begin.
However, the time needed to prepare a dependable price should reflect the size and complexity of the project.
The pricing process may involve:
- Reviewing drawings and specifications
- Identifying missing information
- Measuring quantities
- Contacting suppliers
- Requesting subcontractor quotations
- Assessing access and site conditions
- Calculating labour requirements
- Reviewing programme assumptions
- Adding overheads and profit
- Completing a final check
Supplier and subcontractor enquiries can also take time. Specialist firms may need to review drawings or visit the site before they can confirm a price.
When the tender period is too short, builders may decline the opportunity, submit heavily qualified quotes or include larger risk allowances. Others may return a lower price based on assumptions that later prove incorrect.
Allowing enough time gives each contractor a better opportunity to understand and price the project properly.
How to prepare properly without delaying the project
Good preparation does not need to bring a project to a standstill.
The process can be managed efficiently by identifying the required information, assigning responsibilities, and setting realistic deadlines.
Before requesting quotations, the project team should:
- Review the drawings
- Check that the plans are coordinated and that the main construction details are available.
- Define the scope
- Create a clear description of the work, including exclusions, client-supplied items and specification requirements.
- Identify outstanding decisions
- Record any products, finishes or design details that still need to be confirmed.
- Prepare suitable pricing documents
- Use a schedule of works or bill of quantities where appropriate so contractors can return comparable prices.
- Set a realistic tender period
- Give builders enough time to review the documents, contact suppliers and assess the project risks.
- Answer tender queries consistently
- Important clarifications should be shared with every tendering contractor.
- Review quotations carefully
- Compare assumptions, exclusions and provisional sums rather than focusing only on the final price.
Planning, surveys, design coordination and pricing preparation can often progress alongside one another, provided that information is issued in a controlled and organised way.
The value of professional construction estimating
The cost of rushing a construction project is rarely limited to one missed item.
Poor preparation can affect the original budget, the reliability of quotations, the contractor’s margin and the relationship between the client and builder. It can also create delays that are far greater than the time initially saved.
Professional estimating gives structure to the pricing process. It helps ensure that labour, materials, subcontractors, preliminaries, overheads and profit are considered before a quotation is submitted.
Specialist construction estimating services can also support clients and design teams by preparing cost plans, schedules of works and bills of quantities suited to the project.
The aim is not to slow construction down or remove every possible uncertainty. No project can predict every site condition, price change or design development.
The aim is to begin with a clearer understanding of the work, the likely cost and the responsibilities of everyone involved.
A little more time spent reviewing drawings, preparing tender documents and checking the estimate can protect months of construction work. In many cases, the quickest route to a successful project is to make sure it is properly prepared before work begins.
