Appliance and installation conversion enquiries — not vehicle propulsion
LPG Conversion Certificate
Use this route for a manufacturer-supported appliance fuel conversion or a new or altered LPG appliance installation in a property, catering unit, trailer or converted horse box. There is no single generic conversion certificate, so send the work history, appliance evidence, setup and required paperwork before attendance is considered.
Start with the work, not the document name
"LPG conversion certificate" can describe different jobs
Customers, insurers, organisers and buyers may use the same phrase for unlike work. A safe booking begins by identifying what changed and who carried out the gas work.
Three requests that must not be confused
Choose the closest LPG conversion route
Appliance converted to LPG
A natural-gas or other appliance is proposed to operate on LPG. The exact model must be approved for conversion by its manufacturer, using the specified components and instructions.
New or altered LPG installation
An LPG system has been installed or changed in a building, food truck, catering trailer, horse box, mobile bar or similar unit. The work history, installation and intended use must be understood.
Vehicle engine or propulsion conversion
Converting a vehicle engine to run on LPG is automotive work. It is outside this service and should be taken to a competent automotive LPG converter who can address vehicle, insurance and registration evidence.
The exact installation defines the competence
What must be matched before attendance
LPG registration or competence is not one blanket permission for every appliance and setting.
Good evidence prevents the wrong visit
Information needed before an LPG conversion quote
Appliance and conversion evidence
- Every appliance make, model and clear data-plate photo
- Fuel before and after the proposed conversion
- Manufacturer conversion instructions and kit reference
- Who completed or proposes to complete the gas work
- Invoices, commissioning sheets or earlier records
- Photos before panels are closed where available
Installation and booking evidence
- Full postcode and property or unit type
- Business, rental, owner, holiday or event use
- Cylinder or bulk supply and regulator arrangement
- Accessible pipework, isolation, ventilation and flue details
- Access, parking and preferred dates
- Exact requester wording and deadline
Authoritative boundaries behind the booking questions
Official LPG conversion and competence guidance
These sources explain why the installer, manufacturer instructions, installation setting and type of conversion matter.
Liquid Gas UK Code of Practice 33Its appliance guidance says modifications should be made by a competent person in line with applicable regulations and manufacturer instructions.
GOV.UK: automotive LPG vehiclesVehicle propulsion conversions have separate road-vehicle, safety and evidence considerations and are not this appliance-installation service.
Use the right words in the quote
Installation, inspection and paperwork are different
Physical gas work completed using appropriate components, instructions, testing and commissioning for the exact appliance and setting.
Checks of the installation as accessible and presented. The scope may need to expand when records are missing or work is concealed.
Evidence of the work and checks actually completed. It cannot truthfully certify work, areas or outcomes that were not established.
The first visit may not produce favourable paperwork
Possible LPG conversion inspection outcomes
The result depends on the accessible installation, evidence, testing and safety findings—not the document name entered on the enquiry form.
Possible next steps
- Appropriate record for the completed scope
- Further manufacturer or installer evidence requested
- Parts exposed for inspection or testing
- Remedial or replacement work quoted
- Return attendance after correction
- Referral to a different LPG or automotive specialist
Postcode and competence are checked together
LPG conversion enquiries in London, Essex, Kent and by request
Regular work area
Regular LPG work covers London, Essex and Kent. Send the complete postcode because travel, site access and the suitable LPG category affect the quote.
Considered when the right trade is available
Hertfordshire, Surrey, Buckinghamshire, Berkshire and Sussex can be considered. Other UK areas are considered by request.
- Full postcode required
- Conversion type and intended use declared
- Appliance and manufacturer evidence supplied
- Access and deadline confirmed
- Relevant competence checked before acceptance
A scoped route before an appointment
Four steps to request an LPG conversion assessment
Check current feedback before sending LPG conversion evidence
Read Upkeepone's live Google results in their original context, then send the postcode, property or unit type, intended use, fuel before and after conversion, every appliance make and model, data plates, manufacturer instructions and conversion-kit details, installer information, cylinders or bulk supply, regulator, pipework, isolation, ventilation and flueing, safe photos, access, exact paperwork request and deadline. Automotive LPG propulsion conversions are outside this service.
Use a more specific route where possible
Related LPG inspection and certificate pages
Questions before booking
LPG conversion certificate FAQs
What is an LPG conversion certificate?
LPG conversion certificate is a customer search term rather than one universal UK document. The appropriate evidence depends on what was converted, who completed the gas work, the appliance or installation type and why the paperwork is required. An engineer must establish the correct inspection, testing and record route from the full details.
Can a Gas Safe registered engineer sign off LPG conversion work completed by somebody else?
Do not assume so. HSE guidance says a Gas Safe registered engineer cannot knowingly sign off gas appliance work carried out by an unregistered person. The assigned engineer must decide whether the work history and installation allow an inspection, whether parts must be exposed, whether remedial or replacement work is required and what record can truthfully be issued.
Can a natural-gas appliance be converted to LPG?
Only where the manufacturer supports conversion of the exact appliance model and provides the correct components and instructions. The gas type, operating pressure, injector or burner components, controls, combustion and data marking must not be guessed. Send the model, data plate and conversion-kit evidence before a visit is arranged.
Does this service cover an LPG conversion for a car or vehicle engine?
No. Automotive LPG propulsion systems are a separate specialist field with vehicle-construction, insurance and registration considerations. This Upkeepone route concerns LPG appliances and appliance installations in properties, catering units, trailers, horse boxes and similar setups, not converting an engine to run on LPG.
Can you consider a new LPG installation in a food truck, trailer or converted horse box?
Yes, as an enquiry. Send the unit type, intended business use, every appliance, cylinder and regulator arrangement, pipework photos, ventilation and flue information, installation history, postcode and organiser or insurer requirement. The relevant LPG, mobile-catering and appliance competence must be available before a booking is accepted.
What details should I send for an LPG conversion quote?
Send the full postcode, property or unit type, intended use, fuel before and after conversion, every appliance make and model, data-plate photos, manufacturer instructions or kit details, installer information, cylinder or bulk supply, regulator, pipework, ventilation, flue, access, photos and the exact paperwork request and deadline.
What may an LPG conversion inspection include?
The scope depends on the installation and applicable guidance. It may include appliance suitability, installation history, gas tightness, supply pressure and regulation, accessible pipework, isolation, hoses and connections, ventilation, flueing, safety controls, combustion, cylinder arrangements, labelling and safe operation. The engineer confirms the actual checks and record for the job.
What happens if the LPG conversion is incomplete or unsafe?
No certificate or favourable record is promised before inspection. The engineer records the relevant finding, explains whether the appliance or installation can be used and identifies any further investigation or remedial work. Parts, repairs, reinstallation and return attendance are quoted separately unless included in writing.
How much does an LPG conversion certificate cost?
A reliable quote requires the conversion evidence first. Price depends on the appliance or installation type, number of appliances, testing scope, accessibility, missing records, travel and whether investigation or remedial work is needed. Upkeepone confirms the proposed scope and quote before attendance rather than publishing one price for unlike conversions.
Which areas do you cover for LPG conversion enquiries?
Regular LPG work covers London, Essex and Kent. Hertfordshire, Surrey, Buckinghamshire, Berkshire and Sussex can be considered when the right LPG trade is available. Other UK areas are considered by request after the postcode, conversion type, appliance or installation scope and required competence are checked.
Send the evidence before requesting attendance
Request an LPG conversion assessment quote
Include the postcode, property or unit, intended use, appliance models, fuel change, manufacturer evidence, installer history, LPG supply, photos, access and exact paperwork wording.
An enquiry does not confirm attendance or paperwork. The conversion type, evidence, installation, postcode, access, relevant competence and current availability are checked first.
