Planning, sequencing and supervising work

Core idea

A useful job plan defines the result, constraints and verification before work starts. It identifies hazards, competence, access, isolations, materials, tools, interfaces with other trades and the order that avoids rework. Supervision then checks that the plan still matches changing site conditions.

What to recognise

• Confirm drawings, specifications and customer or site requirements before ordering and cutting.
• Assign tasks by actual competence and give clear limits for trainees or assistants.
• Plan safe access, isolations, permits and temporary services before the productive task.
• Arrange inspections and tests before work becomes concealed.
• Update the plan when conditions change instead of working around an unassessed surprise.
• Base a method statement on this task's actual hazards and sequence, not a generic template for the job title; it sets out how the work will be done safely, step by step.
• Check delivered materials against the job specification before starting, not only against van stock; a shortage found mid-task tempts unsafe improvisation and a wrong fitting causes delay or non-compliance.
• A permit-to-work sets the authorised task and conditions for controlled work. Check isolations and lock them against reconnection, and safely release, cool or restrain stored energy: a closed valve or an open switch does not mean the pressure, heat or charge left behind has gone.

Apply it

For a bathroom alteration, sequence survey, isolation, protection, strip-out, first-fix routes, pressure or leak checks, building-fabric restoration, second fix, commissioning and handover. Coordinate electrical, ventilation and waterproofing interfaces. Record who accepts each concealed stage.

Reading drawings to scale

Drawings are made to a stated scale. Gov.uk's planning guidance says plans and drawings for a planning application must be drawn to an identified scale, and a plan must also show the direction of north, so it can be matched to the site; a scale bar helps too. A scale is a ratio in the same units: as Ordnance Survey puts it for maps, 1:25 000 means every 1 cm on the map stands for 25 000 cm on the ground. On a 1:50 floor plan, 1 mm on the drawing is 50 mm on site, so a pipe run measuring 84 mm on the plan is 84 × 50 = 4200 mm, or 4.2 m. A drawing at a scale with a larger second number, such as 1:100, shows more of the building in less detail. The location plan that every planning application includes, showing the site in its surroundings, is typically drawn at 1:1250 or 1:2500, scaled where possible to fit A4 or A3 paper, with the site edged in red. A blue line is drawn around any other land the applicant owns close to or adjoining the site.

Working in an occupied home

An occupied home stays in use while the job is under way. Agree access and timings with the occupant, explain when water, gas or power will be off and which rooms are out of use, protect floors and furnishings, and keep escape routes and exits clear throughout the job, not just tidied at the end of the day.

Who does what on a building project

On a larger job the plumber works alongside the rest of the project team, and it helps to know who to ask about what:

• The architect designs the buildings and the spaces around them, drafts the plans, prepares the instructions the site teams work from and draws up the planning application.
• A structural engineer works out the loads and stresses on each part of the structure and how its materials will carry them.
• The quantity surveyor manages the costs: pricing the materials, time and labour for the tender, negotiating contracts, following the costs through each stage and preparing the accounts for payment.
• The construction manager, usually called the site manager, runs the site so the work is finished safely, on time and within budget: hiring staff, making sure the materials are there, organising the work schedules and checking the quality of the team's work.
• A building control officer, also called a building control surveyor or building inspector, assesses the plans and inspects the work to check it meets the Building Regulations.

Limits

A programme date does not override safe isolation, competence or inspection. Supervising does not mean personally doing every task, but it does require clear instructions, monitoring and correction. Stop when asbestos, structural uncertainty, live services or another uncontrolled hazard changes the risk assessment.