What needs to be clarified when planning construction work before it begins?

The purpose of the brief and the scope of work

The purpose of the brief and the scope of work must make clear what change the construction work is intended to achieve and which activities are excluded from the commission. We recommend describing the desired performance in use, rather than simply listing proposed works or materials, as different solutions may achieve the same objective. For example, removing visible signs of moisture damage must be distinguished from addressing its cause, as these require different amounts of work and preparation. The brief must also identify the structural elements, equipment and finishes to be retained, where protecting them affects how the work is carried out. This provides a basis for deciding whether the proposed construction solutions meet the actual need.

When defining the scope of work, we address design, preparation, construction and verification of the completed work separately, as responsibility for these may lie with different parties. If an activity is to be arranged by the client, its content and its relationship to the other work must be described in sufficient detail. It must also be agreed who will arrange temporary supports, building services shutdowns, waste management and protection of surfaces to be retained. Ancillary activities left undefined may later change both the scope of work and the planned sequence, even if the main solution remains unchanged. We therefore recommend including the documents and checks needed for handover in the scope of work, rather than just the physical structure to be completed.

The brief also needs a decision-making procedure, as it may not be possible to uncover every factor affecting construction before work begins. We recommend specifying who approves changes to the solution and what information is required to authorise additional work or investigations. The description of a change must distinguish between its cause, its technical impact and its possible effect on other planned activities and how they are organised. Verbal clarifications should be documented so that all parties have access to the same understanding, including during any later review. A clearly worded decision-making procedure helps keep the brief, the design and the actual scope of work aligned, even as further initial information becomes available.

• Desired outcome and performance in use
• Activities included in and excluded from the scope
• Structural elements to be retained and protective measures
• Approving and documenting changes

Documenting existing conditions

Documenting existing conditions provides a verifiable basis for the project brief, but collecting documents alone is not enough to describe actual conditions reliably. We recommend comparing existing drawings with on-site measurements, visible building elements and the locations of building services, and recording all discrepancies identified. If a drawing has not been checked for accuracy, it must be treated as an assumption rather than confirmed information on which a solution can be based unconditionally. The inspection should separately record damage, signs of previous alterations and areas where safe or adequate access is unavailable. These observations help establish which background information needs further verification or clarification before a design decision is made.

Photographs are useful when they allow the location shown and its relationship to the proposed work area to be clearly identified later. We recommend linking photographs to a plan, room reference or another clear location description, and adding an explanation of exactly what each image documents. Measurement records must state the scope and limitations of the survey, particularly where surface finishes conceal building elements relevant to the construction work. A straight visible surface or a sound finish does not establish the condition of the structure behind it or the suitability of the proposed solution. Documentation must therefore distinguish observed facts from assumptions and identify questions the inspection has not yet answered.

In addition to building elements, the documentation must describe conditions that affect material transport, the use of tools and equipment, and the organisation of preparatory activities in the specific work area. These include access routes, opening dimensions, storage options and the locations of existing connections and shut-off points where these are needed for the work. We also recommend checking whether the proposed work area boundaries reflect actual access and the space needed to carry out the work. Inadequate access can make a method that initially appeared suitable impractical, or require additional preparation before the main work can begin. These constraints must inform subsequent decisions so that the work sequence and budget are not based on unverified assumptions.

The need for investigations and approvals

The need for investigations and approvals must be guided by questions whose answers could change the proposed solution, the scope of work or the ability to carry out the work safely. Before commissioning an investigation, we recommend defining which decision its findings will support and which part of the work area requires information. Simply naming an investigation does not establish its required scope, the method to be used or how precise its conclusions need to be for a particular solution. For example, altering a load-bearing element may require information about its material, dimensions, connections and loads, rather than just a description of visible damage. The investigation brief must therefore be linked to the proposed construction solution and the information missing from its assessment.

When selecting an investigation method, consider whether the necessary information can be obtained from documents, through measurements or only by carefully opening up the building element. Where opening-up work is required, we recommend agreeing its locations, safety measures and any need for temporary closure or reinstatement in advance, in line with the planned scope of the investigation. Where necessary, risks relating to building services, hazardous substances or structural stability must be assessed by a qualified specialist before any intervention. If only a limited area can be investigated, the investigation summary must explain how far the findings can reasonably be applied to the rest of the building element. This prevents a single opening from becoming an unjustified basis for assumptions about the entire building.

Alongside approvals, a separate check must establish whether the proposed activity requires a building notice, a building permit or any other statutory procedures before work begins. These requirements depend on the nature of the work and the building's circumstances, not simply on the title of the order or quotation. We recommend clarifying the requirements with the local authority and, where necessary, the network operator or another affected party before making binding decisions about the work. Information submitted for approval must reflect the actual solution, as a later change may also require an earlier consent to be reviewed. Planning must therefore distinguish between consents already obtained, procedures still in progress and conditions that must be met before work begins.

Dependencies and sequencing of work stages

When planning the work sequence, we start by establishing what must be achieved before the next stage can begin and how readiness will be assessed. For example, structural strengthening cannot be planned solely as an installation task if it must first be preceded by load redistribution, temporary support or substrate preparation. We therefore link each stage to a specific prerequisite and a verifiable outcome, rather than simply a desired slot in the schedule. We also establish who will confirm that the preceding work is ready and what information must be available to make that decision. This allows dependencies to be taken into account before committing resources, ordering materials and handing the work area over to the next contractor.

For activities scheduled to run in parallel, we check whether they require the same work area, access route or temporary building services, and whether they can safely be carried out together. Working simultaneously may not be practical if dust, moisture or vibration from one activity prevents another from being completed to the required standard. We also allow for drying, curing and other process-related waiting times that cannot simply be shortened by adding more labour. Where necessary, we allow time between delivery and installation for acceptance checks and storage arrangements. This ensures that the schedule reflects actual working conditions, rather than just desired activity durations or apparent opportunities for overlap.

The dependencies between work stages must remain clear even if some of the initial information is clarified during the work and the original solution needs to change. To achieve this, we distinguish activities that can be rescheduled from those whose delay would halt subsequent work or make it impossible. We agree on which changes require a schedule review and how updated information will reach everyone involved before the affected stage begins. We pay particular attention to decisions that must be made before materials are ordered or structural elements are enclosed. The work sequence must identify decision points as well as construction activities.

• Confirmation that the preceding stage is complete
• Availability of the work area and access
• Allowance for process-related waiting times
• Dependencies between decisions and deliveries

Budget assumptions and uncertainties

When preparing a budget, we distinguish the known scope of work from assumptions that still need to be confirmed and may affect both the solution and its execution. To compare quotations, it must be clear which preparations, supporting activities and associated costs are included in the proposed scope and which are excluded. For example, temporary supports, waste handling or transport under special conditions can affect the total cost even if the description of the main work remains unchanged. We therefore set out the underlying conditions and scope boundaries alongside the budget. Comparable prices require comparable work content, not merely similar descriptions on quotation lines.

A general note that additional work may arise during construction is not enough to address uncertainty, as it does not help anyone prepare for decisions. We describe the reason for a potential deviation, how it will be investigated, which part of the work may be affected in cost terms by the findings, and at what stage the impact would occur. If the condition of a structure can only be established by opening it up, the extent of that opening and the subsequent decision-making process must be agreed in advance. We also clarify the basis for pricing any additional work and who is authorised to approve it. This makes the process for revising the budget clear before any additional cost arises.

We review budget and schedule assumptions together, because a change in working conditions can affect the method of execution, the sequence of activities and their cost at the same time. Restricted access may require different lifting equipment, work to be split into stages or materials to be moved repeatedly—factors that may not have been included in the original scope description. An unresolved technical issue may also render a planned order or preparatory work useless and lead to avoidable rework. We therefore link cost reviews to the decisions that allow the scope of work to be assessed more reliably. A financial contingency is no substitute for clarifying missing information or obtaining approval for changes through the agreed process.

Checking prerequisites before work begins

Before work begins, we check that the documents, decisions and organisational arrangements needed for the planned activity are actually in place and consistent with one another. Having a design alone does not mean that all prerequisites for starting work have automatically been met or that every stage is ready to proceed. Depending on the nature of the work, we must also review whether a permit or notification is required and whether the relevant conditions have been met. The checks cover handover of the work area, access, temporary arrangements and the availability of necessary services. For each shortcoming, we determine whether it prevents work from starting or only affects a specific later stage.

The decision to start must be based on a shared understanding of the solution to be implemented and the questions that remain open and require clarification. To establish this, we check the current document versions, conflicting instructions and whether changes have been reflected in all affected parts of the work before orders are placed or construction proceeds on that basis. We also clarify whom to contact with technical questions and how decisions will be documented and communicated to those carrying out the work. If the solution requires clarification from the designer, a verbal assumption cannot replace the necessary technical decision. Each open issue must be clearly identified, together with the person responsible and the next step needed to resolve it.

In the final pre-start check, we distinguish between readiness across the site as a whole and readiness to begin a specific phase, as these may differ in both timing and scope. Some preparatory activities can proceed while the solution for a later phase is still being refined, but their impact must be assessed. This is possible where the earlier activity does not unduly restrict subsequent choices or lead to avoidable rework. We document the findings so that the permitted scope of work and remaining restrictions are unambiguous. The decision to start must be based on fulfilled prerequisites, not simply a desire to move the schedule forward.