Architect cost estimation experiences?

You should be aware that a (real) core renovation plus extension is generally more expensive than cheaper compared to a new build. If you’re lucky, you might end up with a price equivalent to a new build. It is significantly more laborious to dismantle the old stuff and then fiddle it in anew with a lot of precision and effort than to start on a greenfield site.

I can confirm that. Briefly calculated against experience from settled own construction projects: 116m2 x gross €3,500 (conversion with changes to floor plans + load-bearing components, complete renewal of the roof structure) + 54m2 x gross €4,500 for the new build = gross €650,000, including incidental construction costs (cost groups 300/400/700), excluding exterior works/interior fittings (cost groups 500/600). The costs do not consider the individual requirements of your construction project, surprises during construction execution in the existing building, etc. A buffer of at least 20% must be considered.

The architect’s fee according to HOAI 2021 in fee zone III/basic rate with a calculated amount of eligible construction costs net €545,000 and the commissioned service phases 1-8, a conversion surcharge of 20% (lower limit for building in existing stock), incidental costs of 8%, and VAT of 19%: gross €102,500.

€100,000 for an architect - does he then only take care of this one house the whole year or what?^^ You can almost only laugh if it weren't so bitter.

I don't know in which region you are building, but the costs for the shell construction and scaffolding alone seem extremely high to me. We are building in NRW near a large city and pay, for example, less than half for the scaffolding with more than double the living space. The carpenters and roofers also seem to me to be priced much too high (despite dormers). Not to mention the architect fees...

These are just estimates generated by software for the architect. At least he can calculate your fee.

What I find bad is that this creates effort and uncertainty for the clients.

If I were the client, I would give the architect the boot and rather build a new building, unless one is attached to the "old building".

I don't know which region you are building in, but the costs for the shell construction and scaffolding alone seem extremely high to me. We are building in NRW near a big city and pay, for example, less than half for the scaffolding with more than double the living space. The carpenters and roofers also seem much too high to me (despite dormers). Not to mention the architect fees...

Thank you for sharing your experiences. We are building in Baden-Württemberg near Stuttgart. How much do you pay for the architect? It is already the case that the architect's fee is calculated according to the current HOAI and only seems exorbitant because the construction costs are so high.

Apart from the fact that I find the fee incomprehensibly high, or rather the whole calculation more than high (but I really have no idea about that), you also have to say that

100,000€ for an architect - does he then supervise only this one house for the whole year or what?^^

in the end maybe only about a quarter of the fee remains, because you have to pay taxes and have fixed costs (e.g. possibly expensive office rent). And yes, you actually don’t have such orders every week. If there are even four per year…

Because of this, I was well taken care of with a general contractor house build and have no idea about the prices.

With a new build by a general contractor at 3000€/sqm
510,000€
50-100,000€ ancillary construction costs
you would have a standard house