Building or property — what gets an energy certificate?

The energy performance certificate covers the building. A property with six apartment blocks needs six certificates, each with its own issue date and therefore its own expiry ten years later. Put that way it sounds obvious, and it is still the single most common reason a portfolio believes it has full coverage when it does not.

The reason is that management happens in the property's world and inspections in the building's.

Two different units used interchangeably

Term	What it is	Identified by
Fastighet (property)	A legal unit — land with any buildings on it, the thing bought and sold	Property designation, e.g. Kvarteret Björken 3
Byggnad (building)	A physical unit on the property	Building ID or house number, plus address

Contracts, title, taxation and budgets hang on the property. Energy certificates, ventilation control and radon measurement hang on the building. There is no given translation between them, and the gaps arise in that space.

Ventilation control complicates it further: OVK actually attaches to the ventilation system, which is neither a property nor necessarily a whole building. One building can have two systems on different intervals — see ventilation intervals.

How the gap arises in practice

The sequence is almost always the same:

1. The portfolio is registered with one row per property, because that is how it was acquired and budgeted.
2. A certificate arrives and is filed against the property, because it came as a PDF to a manager who put it where it belonged administratively.
3. The property therefore appears to have a valid certificate.
4. The five other buildings on the same property do not exist as rows anywhere, and therefore cannot be missing anything.

Nobody made a mistake at any single step. The result is still that five buildings are invisible to every follow-up — they are not missing, they do not exist.

We have a certificate for the property — isn't that enough?

No, and the phrasing gives the problem away: there are no certificates for properties. A certificate is produced for a building and contains that building's data — area, heating, energy performance, energy class. If the property has several buildings, the certificate describes only one of them, and it is rarely obvious which.

The way to establish that is to read the address in the certificate and match it against the building, not against the property.

The certificate that matches no building

The reverse case is just as common and more confusing: a certificate exists, but its address corresponds to no building you have registered. The causes are mundane — the address has changed, the building has several addresses and the certificate uses a different one from your register, or the address is spelled differently or carries a different street number.

The effect is that the certificate counts as present in a binder and missing in a system, or the reverse. In a portfolio of any size this is not an edge case but a running source of error.

What to do about it

1. Make the building the row, not the property. The property becomes a grouping above it.
2. Give each building an identity — building ID or house number — and record every address it has.
3. Match certificates on address, and put the ones that do not match in their own pile rather than letting them vanish.
4. Calculate coverage per building. See coverage across a portfolio.

Step three pays off fastest. The pile of unmatched certificates is usually small and nearly always contains at least one building assumed to lack a certificate that in fact has one.

How Emphyx is built

The data model follows reality rather than the binder: property → buildings → one energy certificate per building. Certificates are read in, linked to a building by address, and those that cannot be matched are raised as their own item instead of quietly landing in the wrong place. Regulatory compliance therefore calculates coverage per building, which is the only level at which the figure means anything.

It does not solve the fact that the municipal address register and your own list can say different things about the same house. It makes the difference visible instead of hiding it.