Should I replace an old boiler before selling?

Not usually. If it works and is serviced, document it. Replacement rarely returns its cost in the sale price.

Does the heating affect the Home Report?

It affects the energy report and can be commented on in the single survey, particularly if the system is aged or not working.

Pre-sale preparation

Heating checks before selling

Serviced, documented, and honestly described

The short answer

Buyers ask three things about heating: how old the system is, when it was last serviced, and what it costs to run. A recent service record answers two of them for a modest cost and prevents the assumption that an unserviced boiler is at the end of its life. Replacing a working older boiler purely to sell rarely returns its cost.

What the work involves

Booking a service, obtaining or locating the installation and service records, checking radiators heat evenly, and bleeding or balancing the system.

Rules and responsibilities in Scotland

Gas work must be carried out by a Gas Safe registered engineer. Boiler installations should have been notified and have a completion or benchmark record, which buyers' solicitors sometimes request.

What commonly goes wrong

Replacing a working boiler shortly before marketing, and being unable to produce any record of installation or servicing for a system that is actually sound.

What it usually costs

Indicative ranges only, to help you judge a quote. They are not an estimate for your property — only the business doing the work can give you that.

A service is a small cost that removes a recurring buyer objection.
Replacement rarely returns its cost at sale unless the system has failed.
Missing paperwork can sometimes be recovered from the installer or the manufacturer's registration.

What to do, in order

1Book a service with a Gas Safe registered engineer.
2Find the installation paperwork, benchmark record and any warranty.
3Check every radiator heats evenly and bleed as needed.
4Note the system age honestly for the property questionnaire.
5Keep the service certificate with the sale paperwork.

Local detail for the Lothians

Many Edinburgh tenement flats have flues and boiler positions constrained by the building, which affects what a buyer could change later.
Some city centre flats have no gas supply and use electric systems or a heat network — running costs are what buyers ask about.
Engineer availability in the Lothians tightens from October, so book the service before autumn if selling then.

When you need a professional

A Gas Safe registered engineer for the service; for electric or heat network systems, the supplier or an appropriate qualified engineer.

Common questions

Should I replace an old boiler before selling?: Not usually. If it works and is serviced, document it. Replacement rarely returns its cost in the sale price.
Does the heating affect the Home Report?: It affects the energy report and can be commented on in the single survey, particularly if the system is aged or not working.

Lothian Property is a property information and professional-introduction service operated by Maybury Scotland Limited. Lothian Property is not an estate agency. Where requested, we may connect homeowners with independent estate agents and other property professionals. How we work.

Paperwork and certificates
The documents a buyer's solicitor will ask for, gathered before they ask.
Electrical checks before selling
What buyers and surveyors ask about the wiring, and what evidence answers it.
Preparing for the Home Report
What the surveyor looks at, and the work worth doing before they visit.

Last reviewed 4 September 2026.