A small home does not mean that its water supply can be planned on the last day of installation. On the contrary, limited space makes it important to agree equipment locations, servicing and the connection to the external inlet in advance. The following planning example for a 35 m² modular home is educational. It is not a design for a particular building, a quotation or a standard detail suitable for every manufacturer. Its purpose is to show the sequence of decisions so that the owner can provide focused information to the designer and contractor.
First describe people and use
The example assumes two permanent users and ordinary domestic use. Rental, summer-only occupation or frequent extra guests change the task. A 35 m² figure alone does not establish demand, simultaneous use or winter operation.
At the outset, record whether there will be a shower, bath, dishwasher, washing machine and outdoor tap. Mark future wishes separately. A clear statement that a dishwasher is only planned is better than an unspoken assumption that emerges after finishes are completed. A precise brief allows different proposals to be compared at the same scope.
Identify the water source and known conditions
A public supply, borehole or another private source has its own installation and water-quality questions. This example does not establish which source suits your plot. Actual data is needed, not a universal pump or filter selected according to the home's floor area.
If the source is private, show the tests available and pump information. Filtration equipment is not selected solely on a neighbour's experience. It may need space, maintenance and a separate drainage solution. In a small home, these additional components must be provided for early so that they do not later occupy a passage or obstruct other equipment.
Create a compact plumbing core
Consider kitchen, bathroom and water heater together. The US DOE explanation of compact plumbing discusses the benefits of shorter hot-water routes. This is a design principle, not a requirement to arrange every room identically or transfer US programme criteria into a Lithuanian design.
In the example, the kitchen and bathroom adjoin a shared technical zone. This allows a shorter pipe route to be sought, but the solution must still be checked for construction and maintenance. An attractive furniture plan alone does not show whether space remains for connections, isolation and servicing. Technical details must be visible before the final interior is approved.
Count actual outlets
Prepare a table showing each fixture, its cold- and hot-water requirements, drain connection and maintenance notes. This helps distinguish what is included in a proposal. An outdoor tap or an additional washing machine should not appear only when the contractor has brought the materials.
| Example outlet | What to coordinate |
|---|---|
| Kitchen sink | Tap, isolation and drainage |
| Shower and basin | Models, connections and waterproofing details |
| Toilet | Supply, fixing and drainage connection |
| Laundry appliance | Actual model and instructions |
| Water heater | Location, servicing and safety arrangements |
The table is not a calculation of pipe diameters. It only prepares information for the design.
Quantify the wait for hot water
An educational example. A straight 8 m pipe with a 12 mm internal diameter has approximately 0,90 litres of geometric volume. Use the cylinder formula: π × 0,006² × 8 m³. This is pipe volume only; actual waiting also depends on flow, temperatures, equipment and other components.
This figure helps explain why the actual route length and internal diameter matter. However, diameter must not be reduced solely to lower the volume. It must be selected according to hydraulic requirements. A compact plan first seeks a shorter route, not an arbitrarily narrower pipe.
Draw a separate inlet section
If the home is on piles, the transition from the ground to the heated interior must be shown clearly. This detail must not be assumed to be automatically included in either factory or site work. Agree who installs the pipe, sealing, insulation and necessary protection.
Before covering, check the actual installation. Photographs must show the overall view and the detail's components. If the solution changed, update the drawing. In a small home, an error of a few centimetres or an unsuitable location can cause major maintenance inconvenience, so acceptance should not be postponed until final finishing.
Service space is not leftover cupboard space
The water heater, filter and valves need access specified by the manufacturer. All the equipment must not be squeezed together merely because floor area is limited. Show the furniture contractor the actual equipment plan and discuss how service locations will be opened.
If an appliance needs replacement in future, it must be possible to remove it without dismantling the whole bathroom. This is a practical question worth asking before installation. An attractively closed cupboard is not a good solution if an inaccessible detail or a possible unseen leak remains behind it.
Test before concealment
Testing methods and parameters must suit the particular system. Uponor multilayer-pipe FAQs link testing to a competent specialist and the manufacturer's procedure. We therefore do not provide one pressure and duration for every pipe.
The acceptance record must show what was tested, who performed the test and the result. A new check may be needed after an additional section is connected later. A factory test alone does not describe every connection installed on site, so the interface between the work stages must remain clear.
Separate factory and site costs
When comparing proposals, identify which section is prepared in the factory and which is completed on the plot. Connection, inlet protection and final tests should not remain assumed. If both contractors regard an item as part of the other's work, assign it clearly before ordering. You will then see the whole required scope in the small-home budget, not only an attractive initial package.
Agree winter use separately
In the example, the home is used continuously, but an actual seasonal property will need another plan. Turning off the water is not complete shutdown preparation, and a heat pump does not automatically protect an inlet beneath the home. These questions must be discussed as part of the design.
For your 35 m² home, send an enquiry with a plan, appliance list and schedule of use. We discuss internal systems in the plumbing section. What best helps a small property is not the lowest pipe quantity, but a clear solution that can be checked and maintained later.
Information sources
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