Sign in

Renovation guide

Energy score and renovation: what to check before buying

How to include energy score, works and energy costs in a property purchase search.

6 min13 May 2026
Belgian city with residential housing

The energy score affects comfort, energy costs and sometimes the works to plan after purchase.

A weak score does not automatically rule out a property, but it must be connected to price, works budget and how long you plan to keep the home.

Key points

Read the energy score as a budget signal, not only as a label.

Separate urgent works from improvements that can wait.

Keep a reserve for insulation, heating, ventilation or windows.

Read the score in context

Compare the score with property age, heating, windows, insulation and surface. Two properties with the same score can require very different works.

Ask for available recommendations and what has already been renovated.

Identify work items

Frequent items include roof, walls, windows, ventilation, heating and sometimes electricity.

Before considering an offer, separate what is needed to live comfortably from what can wait.

  • roof
  • insulation
  • windows
  • heating

Connect energy score and purchase budget

A cheaper property with major works can become more expensive than a better insulated property. Include a works margin before comparing.

Wimmio helps track listings, but renovation amounts should be estimated with companies or relevant experts.

Frequently asked questions

Should I avoid every property with a weak energy score?

Not always. It depends on price, possible works, your budget and the performance you want to reach.

Is the energy score enough to estimate works?

No. It gives indications, but a quote or technical opinion remains necessary.

Compare homes with a renovation margin

Set your search and keep the global budget in mind, not only the asking price.

Start my search
Energy score and renovation: what to check before buying | Wimmio