What happens on the day of your installation
Knowing roughly what to expect on the day helps a household plan around the work, even though the exact sequence varies with the specific job. Most installations follow a broadly similar structure from arrival through to commissioning.
Installation day explained in plain terms
The day typically starts with isolating existing supplies and protecting the work area, followed by removing the old appliance where relevant, then installing the new one along with any pipework, flue or controls work identified at survey. Once fitted, the system is filled, the appliance commissioned and tested, and the household is shown how to operate the new controls before the engineer leaves.
Key points on installation day
- Existing supplies are isolated and the work area protected before work starts
- Old appliance removal happens before the new one is installed
- Pipework, flue and controls work follows the scope agreed at survey
- Commissioning and testing takes place once the appliance is fitted
- The household is shown how to operate new controls before the visit ends
Where we deal with this
Who should undertake the work
- Gas appliance work must be completed by a suitably qualified Gas Safe engineer
- Oil appliance work should be completed by a suitably qualified OFTEC technician
- Jamie Crawford Heating states both Gas Safe and OFTEC registration
Talk to us about installation day
Our advice: Installation day follows a consistent structure — isolate, remove, install, commission and hand over — even though the detail varies by job.
Include the appliance make and model in your enquiry so the correct technical information can be checked.
Related help pages
- Cost driversHow flue routing affects the scope of an installation
- ProcessHow deposits and payment stages typically work
- ProcessRecord keeping after heating work is completed
- Cost driversWhen scaffolding or extra access equipment is needed
- Appliance ventilationVentilation checks: why airflow around an appliance matters
- Property typeFarmhouse heating: old fabric, modern systems
Services that cover this
Questions we get asked
- Do I need to be present all day?
- Being available at the start and end of the visit is generally helpful, particularly for the handover and demonstration of new controls.
- Will there be mess to clean up afterwards?
- The work area is protected during the job, and general tidying up is part of finishing the work properly.
New Worcester boiler with a 10 year guarantee*
Free no-obligation quotes for installation, servicing & repairs across BA & BS postcodes.