ᐅ Planning a New Single-Family Home Construction with Energy Consulting
Created on: 8 Jan 2017 15:43
Z
ZeroDown
Hello everyone,
first of all, Happy New Year to you all 🙂
We are currently in the planning phase of our single-family home for two adults and a very small baby 🙂
I am currently looking at a plot of land (around 1500 m² (0.37 acres)) and once that is settled, I will take my floor plan idea to a trusted architect to discuss it and then have a plan drawn up. (Postal Code: 95515)
Of course, I still have many gaps in my knowledge and wanted to ask for your advice on the best way to proceed.
Here are the key points:
A single-family house built with solid construction and a very, very high amount of own work effort / sweat equity (father-in-law is a passionate excavator and crane operator, brother-in-law and brother are masons; my dad is a painter and all-round craftsman), even if it takes 2 years 🙂
A basement (usable area approx. 90 m² (970 sq ft); unheated/living space excluded); ground floor plus one upper floor with about 180 m² (1,940 sq ft) of living space; a double garage approx. 40 m² (430 sq ft) (neither basement underneath nor built over)
A staggered mono-pitched roof (solid roof construction - entirely by the carpenter) with a large photovoltaic system (based on the current floor plan, about 16 kWp is possible with south orientation). Planning for this is already quite advanced 🙂 Roof covering therefore with trapezoidal metal sheets.
Triple-glazed windows
Controlled mechanical ventilation system
Heat pump with ground collector / trench collector
Possibly KNX home automation
Possibly expandable with a small wood stove in the living room, i.e. pre-install/build a chimney
Possibly air conditioning (split unit)
What I have in mind as underlying goals:
A house as cost-effective as possible (price/performance ratio must be right), hence a lot of own work effort
At least state-of-the-art technology
Where I hope to get your support:
1. At what stage do you involve which type of energy consultant?
1a. What kind of house am I building? KfW 70 / KfW 55 / KfW 40 / KfW 40+ (photovoltaic storage is not really economical); tendency leans towards KfW 40, as it seems likely achievable, right?
2. How do I build it? 24 cm (9.5 inches) sand-lime brick + insulation / 36 cm (14 inches) aerated concrete / or something completely different?
3. How do I heat it? Ground source heat pump with trench or surface collector?
What other important information have I forgotten?
What are your opinions on our plan?
Many thanks in advance and best regards
Marco
first of all, Happy New Year to you all 🙂
We are currently in the planning phase of our single-family home for two adults and a very small baby 🙂
I am currently looking at a plot of land (around 1500 m² (0.37 acres)) and once that is settled, I will take my floor plan idea to a trusted architect to discuss it and then have a plan drawn up. (Postal Code: 95515)
Of course, I still have many gaps in my knowledge and wanted to ask for your advice on the best way to proceed.
Here are the key points:
A single-family house built with solid construction and a very, very high amount of own work effort / sweat equity (father-in-law is a passionate excavator and crane operator, brother-in-law and brother are masons; my dad is a painter and all-round craftsman), even if it takes 2 years 🙂
A basement (usable area approx. 90 m² (970 sq ft); unheated/living space excluded); ground floor plus one upper floor with about 180 m² (1,940 sq ft) of living space; a double garage approx. 40 m² (430 sq ft) (neither basement underneath nor built over)
A staggered mono-pitched roof (solid roof construction - entirely by the carpenter) with a large photovoltaic system (based on the current floor plan, about 16 kWp is possible with south orientation). Planning for this is already quite advanced 🙂 Roof covering therefore with trapezoidal metal sheets.
Triple-glazed windows
Controlled mechanical ventilation system
Heat pump with ground collector / trench collector
Possibly KNX home automation
Possibly expandable with a small wood stove in the living room, i.e. pre-install/build a chimney
Possibly air conditioning (split unit)
What I have in mind as underlying goals:
A house as cost-effective as possible (price/performance ratio must be right), hence a lot of own work effort
At least state-of-the-art technology
Where I hope to get your support:
1. At what stage do you involve which type of energy consultant?
1a. What kind of house am I building? KfW 70 / KfW 55 / KfW 40 / KfW 40+ (photovoltaic storage is not really economical); tendency leans towards KfW 40, as it seems likely achievable, right?
2. How do I build it? 24 cm (9.5 inches) sand-lime brick + insulation / 36 cm (14 inches) aerated concrete / or something completely different?
3. How do I heat it? Ground source heat pump with trench or surface collector?
What other important information have I forgotten?
What are your opinions on our plan?
Many thanks in advance and best regards
Marco
Hmm, I’m not sure if I may have expressed myself unclearly, but your cost estimate is nowhere near what I have.
I have three orders from friends and family with actual costs. Two of these houses are larger, one is somewhat smaller. The amount of DIY work is roughly at a level I can also manage.
I will be building here in a remote area, so the land price alone is already around 100,000 euros (including notary fees, property transfer tax, land registry, etc.). A double garage (my uncle built one just two months ago) costs nearly 20,000 euros as a precast concrete garage (including foundation and installation). We built ours ourselves for about half that cost (including planning and structural engineering), and it’s paved inside, just like I want it.
The photovoltaic system cost is correct, but I will get the VAT refunded. Regarding the basement, I don’t see costs anywhere near 50,000 euros—I don’t pay for excavation, material removal, the excavator operator, or the mason. I do need one additional staircase, one (prefabricated) ceiling more, and, of course, bricks. I don’t have to finish the basement right away; I can do that later if needed. But the storage space will already be available.
I haven’t looked into landscaping yet. I have almost ruled out KNX, and even that wouldn’t add 20,000 euros in extra costs. Controlled ventilation systems are coming. I’m not keen on a fireplace yet, but I want to keep the option open, so I will include a chimney. I have already seen some very nice kitchens for 10,000 euros. And yes, a buffer of about 5-10% is already factored in.
But none of that was really up for discussion. I was more hoping for insights on the wall construction and the pros and cons of KfW subsidy programs.
I have three orders from friends and family with actual costs. Two of these houses are larger, one is somewhat smaller. The amount of DIY work is roughly at a level I can also manage.
I will be building here in a remote area, so the land price alone is already around 100,000 euros (including notary fees, property transfer tax, land registry, etc.). A double garage (my uncle built one just two months ago) costs nearly 20,000 euros as a precast concrete garage (including foundation and installation). We built ours ourselves for about half that cost (including planning and structural engineering), and it’s paved inside, just like I want it.
The photovoltaic system cost is correct, but I will get the VAT refunded. Regarding the basement, I don’t see costs anywhere near 50,000 euros—I don’t pay for excavation, material removal, the excavator operator, or the mason. I do need one additional staircase, one (prefabricated) ceiling more, and, of course, bricks. I don’t have to finish the basement right away; I can do that later if needed. But the storage space will already be available.
I haven’t looked into landscaping yet. I have almost ruled out KNX, and even that wouldn’t add 20,000 euros in extra costs. Controlled ventilation systems are coming. I’m not keen on a fireplace yet, but I want to keep the option open, so I will include a chimney. I have already seen some very nice kitchens for 10,000 euros. And yes, a buffer of about 5-10% is already factored in.
But none of that was really up for discussion. I was more hoping for insights on the wall construction and the pros and cons of KfW subsidy programs.
We are currently building, but not in Bavaria, rather in Schleswig-Holstein. I also find the prices mentioned to be very high. Regarding the walls: please, no Styrofoam, no external thermal insulation composite system. We use a double-shell clinker brick with mineral wool insulation in the cavity; this is unusual in your area, or Ytong plus plaster. Thick Ytong. Porit or a similar product is also fine. This is how we build. It’s fast, ecologically acceptable, the walls stay warm, are less prone to moss, and stable enough to handle accidentally bumping a bicycle against them. To save costs, keep the floor plan simple without many frills, always use 110 cm (43 inches) windows, all the same, underfloor heating with gas and solar thermal, no other complex control technology prone to errors. On the roof, use Braas double S silk matt tiles; they don’t get mossy quickly either. Our kitchen costs about 3,500 plus 1,000 for installation, from Ikea. You can buy windows and exterior doors, for example, from Grandpol near Szczecin, good quality at a fair price. We do no work ourselves and end up with around 1,500 per square meter (without land or landscaping), based on a 135 m² (1,452 sq ft) slab foundation. So, with family support—if it actually comes through—just go for it. Money is cheap. And always remember, keep it simple.
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