Breaking up a project into distinct phases of construction allows us to manage complex work that doesn’t suit a continuous linear process. In this post, we’ll be taking a closer look at the purpose of construction phasing and breaking down what happens at each stage.
Construction phasing is when construction work is split up into stages so that things become more manageable for everyone involved. It involves looking at every part of the on-site process and working out the best sequence for it.
Phasing is an approach that’s particularly well-suited to commercial architecture projects where owners need to keep operations going or where funding is uncertain. Although less common, it can also be used during residential architecture projects when the scope is large enough that tackling everything at once would be overwhelming.
When it comes to planning project phases, there are a number of different ways to divide up and categorise time blocks. You can organise phases by the type of work needed, the space that’s being worked on (e.g. areas of a building), or by building element (e.g. structural engineering, then interiors).
Some of the benefits of this approach are that it allows clients to spread costs over time and can reduce initial financial risk. It also helps to generate income from completed sections while work continues elsewhere.
Construction phasing supports greater flexibility, too. By avoiding working on a single continuous process, it becomes much easier to adjust plans based on early results or changing market conditions.
One of the most difficult things to get right when it comes to construction projects is predicting exactly what will be needed months or years down the line. Market demands can shift, tenant requirements may evolve, and budget constraints can tighten or ease unexpectedly. With phased construction, decisions aren’t locked in. This makes it easier to incorporate lessons learned from completed phases or even pause development if circumstances require it.
As you can imagine, project stages differ depending on the project requirements and what the client needs; however, here is a typical example of a commercial building project categorised by building element:
Phase 1 is dedicated to clearing, excavation, and preparing the ground. This is when foundations, drainage systems, and underground utilities are installed to create a stable base for the structure.
Next, the building’s skeleton is constructed. This might be steel, concrete, or timber framing, depending on the design. Structural elements such as beams, columns, and floor slabs are erected, setting the overall shape and height of the building.
Phase 3 is about closing in the building to make it weather-tight. External walls, windows, roofing, and façades are installed, together with any external landscaping, paving, or car park infrastructure.
Once the structure is secure, internal walls, ceilings, and floors are added. Mechanical, electrical, and plumbing services are coordinated and installed. This stage brings together multiple trades and requires tight construction phase planning to avoid clashes or delays.
After partitions, interior finishes such as plastering, painting, flooring, and joinery are applied. Decorative and functional elements like fixtures, fittings, and furnishings are also added to meet the client’s operational needs.
Finally, all systems are tested to ensure performance and safety standards are met. Snagging is completed, documentation is prepared, and the project is formally handed over for occupancy.
This type of phased approach is particularly well-suited to commercial new-builds or large-scale refurbishments, where multiple teams need to coordinate complex structural and service installations in sequence. This helps maintain clear progress and ensures quality standards are consistent from foundation to finish.
A construction phase plan is there to outline when each stage begins and ends, how it overlaps with other activities, and what resources are required at each point. It also identifies key paths; these are the most important tasks that determine the overall timeline of the project. For example, structural works might need to reach a certain point before external cladding or internal fit-out work can begin – all of this should be in the plan.
Most specialist UK building contractors use scheduling tools such as Asta Powerproject or Microsoft Project to plan and monitor construction project stages. These break the programme down into detailed timelines showing all the key dependencies and durations.
On larger or more complex projects, schedules are integrated into collaborative platforms like Procore or Asite, allowing everyone from architects and engineers to subcontractors to stay aligned as work progresses.
Sectional completion is a contractual arrangement where clauses within a single construction contract designate separate sections or parts of the works, each with its own completion deadline and potentially its own liquidated damages or handover requirements. This is frequently seen in projects with construction phasing where various parts of the project must be finished and ready for use at staggered intervals, despite a single main contractor overseeing the entire works. Sectional completion helps to ensure that the legal, financial, and practical aspects of working in stages are clearly spelt out from day one. This is formalised through the issue of a certificate.
Whether you’re planning a large-scale phased development or a single-phase project, our team of highly experienced architects, engineers, and surveyors are here to ensure every stage progresses smoothly. Reach out to us via our contact form to learn more about what we do or get a quote for your project.
