How is a house designed according to the desired budget?
The key to the solution is mainly in the size of the designed house. The price of each enclosed cubic space is about CZK 5,000 excluding VAT (according to the price indexes in the building industry in 2013). If the house is being built on DIY basis, this amount can be reduced slightly.
How can an investment in a house be made effectively?
For effectiveness of your investment in a house, optimization of the design is important. Thanks to it, you do not make incessant payment for expensive structures, senseless thickness of warm cladding or "for assurance" over-dimensioned technologies.
It is also worth considering whether it pays to invest in a house, which has an unsuitable or for that matter even poorly solved interior traffic and lacks concrete linkage to the land plot and the locality. The rate of return of such an investment is questionable, mainly in case of future sale of the property.
How do you ensure that the house does not exceed your financial means?
The basis is consistent and detailed project design documentation based on all available about the locality and land plot (geological, hydro-geological and radon survey, elevation and planimetric survey of the land plot, …). In case of reconstruction, mainly, information about the existing is necessary (documentation of actual realization of the building, technical building survey, historic building survey, …).
Many a builder thinks that savings must be made at the outset and the design, including the project are obvious. This is certainly not a good idea! The primary saving, which may be in the rage of CZK 50 - 100,000, depending on whether a good project with quality architecture or a simple project is used "only to fulfil the requirements of the authorities", may seem to be large. But in time, it emerges that it is invaluable to know how much the building will cost before start of building construction – thanks to the detailed itemised budget, created on the basis of a detailed project. The individual items can them be adjusted, the building construction can be divided into more stages, it is possible to announce a tender for building contractor and mutually compare the individual bids, avoid additional works, …
How can an additional saving be made?
From practice, we see how the final price of the building is influenced by:
· Choice of basic house structure. Although choice of conventional wall systems can save material costs, it however makes the resultant overall price higher. For example: If we select classic brick blocks for the walls, we must also add the price of creation of additional layers (interior core plaster, mortar, painting, exterior thermal insulation system consisting of bonding agents, insulation, anchoring elements, basic layers and finally surface finish of the façade). Multiple layers not only entail more space for error during implementation, but each of them raises the price of work and material.
Many products exist in the market, which eliminate additional structural layers, e.g. the load-bearing wall can be used directly as the interior finish according to the taste of the builder.
· The length and complexity of the shape of the technological distribution systems. A good design of the house disposition makes it possible to use short interior distribution systems. For example: If the bathing water is heated near the bathroom, a saving is made on the length of the distribution system and heat loss during transport of the water to the final point. The same applies to all other distribution systems, from electricity to heating…
It can be said that simple and rationally designed architecture of a dwelling house in itself optimally combines a cost saving on building construction and its usage, less worries, appreciation of investment and lower ecological trace. The basis is your satisfaction!
What you should know before building a low energy house?
In order for us to get low energy housing, it is necessary to design the house, not only according to the requirements of the client, but also adapt its structure to the surroundings.
The ideal location of a passive house is in an area protected by the surrounding development or greenery with a shadow free southern horizon. But, not all land plots make this possible. On the contrary, some have exquisite views to the north, or are located in locations with strong winds or higher elevation areas, where the sunlight is not so strong. It is therefore very difficult, if not impossible, to design typical passive house or structure, for arbitrary usage and get the desired result anywhere.
In the design of a passive house, it is necessary to consider the following elements:
1. Shape of the object - the interior space should be maximally used and exterior structures should be minimal; this is the, so-called, A/V ratio (area of the facade, roof, floor to the interior volume).
2. Consistent balance of the interior operation of the house – how the individual rooms will be used and what is optimal for them.
3. Quality thermal envelope – (enclosing walls, roof, floor) with zero thermal bridges.
4. The windows are key components of each house. It depends on their design, shape, opening and mode of deployment in the house structure. Windows of quality design that have been deployed properly in the annual balance shall have a higher thermal gain of solar radiation than losses of heat by transmittance from the interior. The windows turn into "radiators", which shall heat your home in the winter.
Thanks to quality design of your house, you not only lower your heating costs, but will not even need air-conditioning. Generally an interior temperature in excess of 25 °C is available at maximum only 10 % of the year.
The term "passive house" does not necessarily mean massive thermal insulation of the envelope. By individual optimisation of the design, we can get the same or even more efficient result at lower building cost. Similarly, we can talk about the source of heat, which we can also design economically instead of over-dimensioning it.
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