How to prepare for your EPC?
A well-prepared EPC means a faster visit, a fairer rating and a report you can use with confidence for your sale or rental. Here is, step by step, how to give yourself the best chances before your RITMODiag surveyor arrives.
The essentials at a glance
- Gather your energy bills and the property’s technical documents (heating, insulation, works).
- Provide access to every room, the loft, the boiler room and the meters.
- The visit usually lasts from 30 minutes for a small studio to several hours for a large house.
- The EPC is valid for 10 years, unless major energy-renovation works are carried out.
Why prepare for your EPC?
Since its reform, the EPC is legally binding: the rating (an A-to-G label) engages the seller’s or landlord’s responsibility and, for the least efficient homes, determines whether the property may be rented out. An assessment carried out under good conditions therefore faithfully reflects your property’s real performance.
By preparing your home in advance, you avoid a return visit, you limit approximations caused by a missing document, and you obtain a report you can use immediately for your listing.
Documents to gather before the visit
The surveyor relies on the property’s real characteristics. Gathering these items in advance allows a more precise assessment, especially for insulation, which is not always visible.
Energy bills
Your latest electricity, gas, oil or wood bills help characterise the heating and hot-water systems.
Proof of works
Invoices and certificates for insulation, window replacement, boiler or heating changes, with the dates they were carried out.
Property documents
Technical description, building permit or construction date, and living area (Carrez law if in a co-ownership).
Equipment manuals
References for the boiler, heat pump, water heater or ventilation system when you have them.
Providing access to the whole property
On the day, the surveyor must be able to inspect the whole property and its equipment. Provide clear access to these key points:
Every room
Each heated room is measured and inspected: clear the access and unlock interior doors.
Loft and basement
Access to the loft and cellar allows the roof and floor insulation to be checked.
Boiler room and equipment
Boiler, hot-water tank, heat pump, ventilation: make these accessible and unobstructed.
Meters
Electricity and gas meters and, where relevant, the electrical panel must be viewable.
Good to know
If a material, insulation or piece of equipment is unknown and cannot be identified, the regulations require the surveyor to assume the least favourable option. The surveyor is not authorised to dismantle or destructively inspect any part of your property.
That is why the more evidence you can provide of existing insulation or equipment, the more your EPC rating will realistically reflect your actual home.
On the day: how it unfolds
The surveyor records the building’s characteristics (areas, orientation, materials, joinery), inspects the heating, ventilation and hot-water systems, then takes the necessary measurements. This data is entered into the official software that calculates the energy label and the climate label.
Expect from 30 minutes for a small studio to several hours for a large house. This duration depends on the surface area, but also on the shape of the property, the presence of different building materials and the number of systems to inspect. Your presence is not required but remains useful to answer questions about the property’s history and the works carried out.
What influences the EPC rating
Several factors weigh on the final label. Knowing them helps you understand your rating and, if needed, target the most effective works.
Insulation
Loft, wall and floor insulation: this is the main performance lever.
Heating system
Energy type and efficiency of the installation (boiler, heat pump, electric radiators…).
Joinery
Single, double or triple glazing, quality of windows and external doors.
Ventilation
Presence and type of mechanical ventilation, which affects heat loss and air quality.
Domestic hot water
Production method (electric, thermodynamic, solar, or coupled with heating).
Common mistakes to avoid
Waiting until the last minute
Look for your bills and proofs several days ahead: some documents (works certificates) can take time to find.
Leaving access blocked
An unreachable loft hatch or a meter behind boxes forces less favourable estimates or a return visit.
Forgetting recent works
Recent insulation or a new boiler that isn’t declared, for lack of proof, cannot be credited at its true value.
Frequently asked questions
How long does an EPC take?
The visit can last from 30 minutes for a small studio to several hours for a large house. The time depends on the surface area, but also on the shape of the property and the variety of materials and equipment to examine.
Do I have to be present during the assessment?
Your presence is not mandatory, but it makes the visit easier: you can open access points and provide the property’s history and works.
How long is an EPC valid?
An EPC is valid for 10 years. However, it must be redone after major energy-renovation works that change the property’s performance.
Can I improve my rating before the assessment?
The EPC measures the property’s real performance: the rating cannot be artificially prepared. However, providing proof of your works ensures they are properly taken into account.
What happens if access is missing on the day?
The surveyor may have to apply a default estimate, often unfavourable, or even schedule a return visit - which is why making everything accessible in advance matters.
Ready for your EPC?
Get an estimate in a few clicks or call your RITMODiag agency for a quick appointment.