Energy label knowledge base
Welcome to the Hollands Duurzaam knowledge base. Here we explain the key energy label terms briefly and clearly - timeless background knowledge, written by a BRL 9500-certified advisor. Looking for up-to-date articles and tips instead? Visit our blog.
Terms
Energy label A to G
What do the label classes from A++++ to G mean, and which label will your home get?
Energy label tax-deductible?
Is the cost of an energy label tax-deductible? Explained per situation.
Provisional and definitive energy label
The provisional label was abolished in 2021. Which label do you need when selling or renting?
NTA 8800
The calculation method behind the energy label since 2021.
EP-online
The official register in which every energy label is recorded.
Primary fossil energy use
The core value (kWh/m²/year) on which the label is based.
BENG
The requirements for nearly energy-neutral new build - and why they do not apply to existing homes.
BRL 9500
The certification that determines who may issue a valid energy label.
Rc- and U-value
Insulation values explained: for Rc higher is better, for U lower.
Energie-Index
The old pre-2021 figure - and whether your old label still counts.
Maatwerkadvies
A tailored sustainability report: measures with costs, savings and payback time.
WWS points
The points system that sets the maximum rent - and how heavily the energy label counts.
Usable floor area
Which square metres count, and why the BAG, listings and the label can differ.
Popular articles
- What does an energy label cost in 2026?
- How long is an energy label valid?
- The NTA 8800 method: what is changing?
- When is an energy label required?
- Improving your energy label: which measures pay off?
Request an energy label?
At Hollands Duurzaam you pay from €220 for an official energy label including free improvement advice - a fixed all-in price, no travel costs within our service area. BRL 9500-MWA-W certified, registered directly in EP-online.