Landlords must arrange annual safety checks for the gas appliances and flues they provide, whether or not the property needs a licence. The Health and Safety Executive sets out who the duty falls on, and we would link its page beside the council one.
No selective licensing scheme covers Normanton. Mandatory HMO licensing may still apply. Its landlord pages list mandatory HMO licensing and a voluntary Wakefield Responsible Landlords Scheme, which the council describes as an "accreditation" scheme that "recognises and rewards landlords who manage their properties to a good standard", and membership of that scheme is a condition of applying for an HMO licence. No gas safety wording appears on the council's landlord page, so none is quoted from it here.
The district has 31 conservation areas and Normanton is one of them. That is a control on what shows on the outside of a building rather than on the plumbing inside it. We would explain how you check the conservation boundary, any Article 4 direction and the proposed work before confirming whether permission is needed, which answers the question on the page instead of on the doorstep.
Gov.uk carries the boiler rules. It says approval may be needed to "install or replace a heating system", that "You do not need advance approval for emergency repairs to your boiler or heating system, but there are rules you must follow", and that "You do not need to get approval yourself if you use someone registered with a competent person scheme". Twenty per cent of the town was built in 2000 or later, and those owners ask about paperwork.