Distinguish the whole project from time on site
A construction estimate does not necessarily include surveys, design decisions, approvals or the preparation of structural and technical information. Ask for a programme that identifies those stages separately rather than treating the builder's proposed site duration as the date on which the entire project can be finished. [1] [4]
A useful project programme should show:
- The measured and structural information needed to establish feasibility.
- The planning route and any supporting investigations.
- Building-regulations design, construction information and relevant notices.
- Construction, inspections and the work affecting occupied rooms.
- Completion checks and the required records. [1] [5] [4] [6]
Some activities can be coordinated alongside one another. However, the programme must distinguish work that can progress from work that depends on a decision, a survey result or a completed legal procedure. [4] [6] [7]
The decision period is not a guaranteed start date
For a valid non-major planning application, the normal statutory determination period is eight weeks, unless an extension is agreed or another applicable period governs the application. That is not a promise of approval, nor does the clock start when you first discuss the idea with a designer. [2]
A permitted-development project still needs its route and restrictions checked, and habitable loft work needs building-regulations consideration. Avoid booking irreversible construction on the assumption that 'no planning application' means that no preparation or approval is needed. [8] [1]
Where work to a party wall is proposed, the relevant notice period is normally at least two months. Earlier commencement needs the adjoining owner's agreement, and an unresolved dispute requires the appropriate procedure. Bat survey requirements can also affect timing because the necessary evidence may depend on the season. [6] [7]
Ask for the disruptive stages to be identified
The new stair opening, changes to ceilings and structural support can affect rooms below the loft. The fire design may also require work to the existing escape route. Ask the contractor to identify when those areas will be affected and what protection and temporary arrangements will be in place. [9] [10] [3]
For your own planning, ask when water, bathroom facilities or other essential services will be unavailable, and whether any occupied area will need to be vacated. Obtain a project-specific answer rather than rely on another household's experience.
Can the home remain safely occupied?
HSE guidance requires construction risks to other people to be managed, including secure boundaries, safe access and protection from falling materials. Children and other occupants must not be able to wander into dangerous work areas. Physical separation and the way materials move through the property need practical planning. [3]
Staying elsewhere during particular operations may be the appropriate arrangement even if you remain at home for other stages. Agree how changing conditions will be assessed and communicated; the occupation plan should not prevent the contractor from managing the work safely. [3] [11]
Check dates against changing guidance
The energy and ventilation changes taking effect from 24 March 2027 have transitional provisions. Confirm the applicable edition when setting the programme, rather than assuming a quotation or planning permission automatically fixes the building-regulations standard. [12]