TGA planner/heating system, affordable construction planning preferred for single-family house

Hello everyone, I received initial offers today from architects/specialist planners for the construction of our single-family house. The lead architect has attached an offer from a "genuine" MEP planner for our structurally simple house (square floor plan 11x11m, two full floors + converted hipped roof, no basement, target Kfw 70). For the planning of the heating system (geothermal energy + underfloor heating including cooling function - cost estimate TEUR 57 all in), a fee of TEUR 14 is to be agreed (planning, tendering, awarding, monitoring), excluding the controlled residential ventilation we requested. Does such an extensive and above all expensive planning have to be done for a "boring" single-family house? I am more familiar with MEP planners from commercial buildings; for residential buildings, I assumed the heating specialist contractor would handle the planning, possibly in coordination with the architect (I understand that certain planning services are also reflected in that price). How did you get your heating / controlled residential ventilation properly integrated into your house? Thanks for all responses, which hopefully will be many.
off topic: By the way, a modest price of TEUR 14 is being charged for construction supervision.

Hello,

Is such extensive and above all expensive planning necessary for a "boring" single-family house? ... for residential buildings, I assumed planning by the heating specialist contractor, possibly in coordination with the architect.

Unfortunately, €uro is not wrong here; most providers skip the calculation of heating loads and instead estimate them roughly based on experience as in the past. The architect only recommends – if at all – a MEP planner; in consultation, – even here if at all – only the surveying of the property and the requirements of the building application take place.

You can commission the last contact I provided you with for the calculation of sizing and heating loads. If I remember correctly, such a calculation costs about €250.00 plus VAT. I rarely keep these figures because they are included in our scope of services anyway.

Rhenish greetings

Hello,

...The last contact I provided to you can be commissioned for the calculation of dimensioning and heating loads. If I remember correctly, such a calculation costs about €250.00 plus VAT. I rarely keep these figures, as they are included in our scope of services anyway

> 95% of heating load calculations are technically incorrect! Especially when controlled residential ventilation with/without heat recovery or AWP or similar is used! Usually, energy saving ordinance/KfW proofs are also fudged!
The consequences are significant: excessive investment (capital service for this), inflated consumption costs

Best regards

Great, I was just about to start a thread like this, so I'm cheekily jumping in. Our preferred building contractor also doesn’t do an explicit heating load calculation; it’s estimated. Additionally, they have little experience with controlled residential ventilation. Therefore, we would also like to hire a specialist (heating, ventilation) for this, meaning for the planning and possibly also the tendering and supervision. But who do you turn to for that? On the building services engineering (TGA) pages, it says these complex calculations are only done for commercial or multi-family houses. For a simple single-family house, the architect is responsible. But the architect often doesn’t have the same expertise as a building services engineer. How do we find someone now, or what exactly should we be looking for? I would be very grateful for a tip!

Best regards, Mecc

Hello,

...How do we find someone now or who do we need to look for? I would be very grateful for a tip!

If needed, send me a PM or better an e-mail directly.

regards

Hello €uro,

> 95% of heat load calculations are technically incorrect!

Your commitment is admirable ... but there are also white sheep

Rhenish greetings