Sewerage design
Tochnyy inzhenernyy raschet sistemy

Sewerage design service is very popular among owners of private houses. Everyone has long been accustomed to comfort in the form of plumbing and sewerage inside the house. In addition, to implement a high-quality engineering system, firstly, it must be correctly designed.

In addition to owners of private houses, the design of sewerage may also be necessary for apartment owners. Most often, this service is in demand among residents of old houses, where engineering systems (water supply and sewerage systems, ventilation, etc.) need effective overhaul due to the end of their service life.

NB: Water supply and sewerage systems are interconnected systems that cannot be considered separately. Therefore, they must be designed together.

Sewer design service
Why you need a sewerage project

Why you need a sewerage project

A project of interconnected water supply and sewerage systems designed by professionals is not only a guarantee of their trouble-free and long-term operation but also the financial security of the client, since a properly selected engineering solution significantly reduces the likelihood of pipe breaks and flooding of neighbors.

In addition, a professional project facilitates the work of the installation team: they will clearly know where and what will be located, at what depth, where it is connected, how many and what pipes are needed, and other nuances.

Installation of sewerage and water supply systems requires special knowledge, including state construction norms and regulations, which are not commonly available for the townsfolk. Therefore, if you are not a high-class engineer of plumbing systems, it is recommended to contact specialists for a project.

Sewerage design requirements

The most important requirement

It is necessary to start designing cottage sewerage system already at the planning stage of the house or before “cosmetic” repairs, if you have to change the plumbing and sewerage in the apartment. It is possible to connect the water supply in an already finished private house (summer house, cottage), but it will be more difficult and will require costly changes in the design or new decoration of the apartment.

When applying for a sewerage project, you need to be prepared for the fact that you will need not only a house plan with the location of future plumbing indicated on it, but already accurately imagine what its throughput will be. As well as other information, for example, the location of engineering systems near the house, if there is a connection to the central city sewer. Alternatively, a site plan with a soil analysis on it, which will help you choose the right location and depth for pipes and water treatment facilities.

Current regulations

When drawing up a sewerage plan in a private house or apartment, it is necessary to comply with all the rules and regulations set forth in the State Construction Standards of Ukraine:

  • В.2.5-75: 2013 “Sewerage. External networks and facilities”;

  • B.2.5-64: 2012 “Internal water supply and sewerage”.

Features of sewerage in a private house

Sewerage design in a private house begins with determining the location of the main riser and the place where wastewater will flow - into the central sewer (tie-in into the city system) or individual treatment facilities (cesspool, septic tank, filter well).

For the final choice of an individual treatment unit, it is necessary to know how much wastewater it must handle, as well as what type of soil on the site. The volume of drains is calculated based on the number of residents in the house and their daily water consumption.

Depending on the chosen treatment plant, certain building standards are applied. For example, for a septic tank, this is:

  • distance to the house - 5-10 m. Usually a septic tank is installed at the stage of pouring the foundation pit for the house;

  • depth of occurrence - from 2-4 m (depending on the soil);

  • to protect the septic tank from destruction under the influence of soil and groundwater, it is recommended to place it in a concrete "pocket".

There are other norms for the placement of sewer facilities on the site. For example, the distance to outbuildings (barn), wells, highways. They also need to be known and observed.

When selecting a sewerage system, the relief of the site plays an important role. The natural slope of the relief allows organizing a natural drainage of water into the water treatment unit (gravity sewerage).

If there is a large difference in relief on the site and it is impossible to place water treatment facilities below the house, then additional equipment will be needed for the system – a pumping station or a fecal pump.

Features of sewerage in an apartment

It is much easier to make a sewerage system project in a city apartment because the house already has a central sewerage system and water supply.

For the effective operation of sewerage in an apartment, several requirements must be met:

  1. slope 2 cm per 1 m;

  2. diameter of the main sewer pipe Ø100-110 mm;

  3. correctly selected pipe diameter for each plumbing fixture: toilet bowls (Ø100 mm), taps, showers, washing machines and others (Ø50 mm);

  4. the correct (small) distance of plumbing fixtures to the central riser because otherwise there will not be enough pressure in the pipes to discharge drains. Therefore, in apartment buildings, several risers are usually installed.

The same requirements (slope, diameter, distance) are also relevant for the efficient operation of sewers in a private house.

What is included in the project of the sewer system

​The documentation that the client receives when ordering a service includes the calculations and graphics.​

What is included in the project of the sewer system


The calculation part is a calculation of the necessary materials and equipment, based on the received data about the premises and the wishes of the client. This stage includes:

  1. pipe diameter calculations

  2. selection of the slope of the pipeline

When making calculations, the number of “wet spots” and the throughput of plumbing fixtures are taken into account.

Graphic documentation consists of three-dimensional (axonometric) and frontal (development drawing, design diagram).

An axonometric diagram is a three-dimensional representation of a pipeline. It displays all previously calculated elements of the sewerage system:

  1. zones inside and outside the house, where pipes pass with all the turns and piping assemblies;

  2. types of pipes with specified materials, diameters and lengths;

  3. locations of water treatment facilities and plumbing.

A development drawing or a frontal design scheme is a layout of engineering communications and plumbing in a particular room.

For example, a bathroom development drawing would show the location and distance between:

  • sewerage pipes and walls or furniture;

  • drain outlets on tiles and plumbing fixtures (bath, washbasin, washing machine).

Graphics Frontal design
Cost of sewerage design

Cost of sewerage design

The price of designing one wet zone (premises with water supply and sewerage systems) – from 4000 UAH.

Examples of projects


  • Utility room
Duct air conditioner Daikin FBA 60

Кондиционеры Daikin FBA 60 – мощные сплит-системы канального типа, предназначенные для скрытого монтажа практически любого помещения.

HVU with heat recovery JABLOTRON FUTURA L

Highly efficient air handling unit for general ventilation in houses and apartments. Reuses the heat and moisture that are present in the room. Has a "native" VAV-system (variable air supply).


A complex of engineering systems in an apartment, Lipskaya street, Kyiv

  • Living room
  • Bathroom
  • Mini-boiler room - 1
  • Mini-boiler room - 2
TROX double slot inline diffuser

Double-slot diffusers from the TROX brand are designed for high-quality air distribution throughout the room. They combine visual aesthetics and high technical potential. Air currents are given in different directions, evenly scattering and avoiding any drafts. Outwardly, only laconic lines on the ceiling remain visible.

Duct air conditioner Daikin FDXM 35F

A low-pressure internal duct unit Daikin FDXM 35F is installed in the ceiling space of the bathroom - it works to cool the bedroom. It is accessed through hatches. The capacity of the air conditioner is enough to service rooms up to 35 m2, which is optimal for a given room. The lowering of the ceiling in a technical room was 300 mm.

Indirect heating boiler Drazice

Vertical indirect heating boiler Drazice OKSE 200 l is designed to provide apartment residents with hot water. The inner surface of the tank is covered with high-quality enamel without nickel, which ensures a long operation of the water heater, and there is also an anti-corrosion coating. The temperature inside can be kept between 7 and 77 ℃. The water heating indicator always shows the current temperature on the front of the tank. There is a fast heating function. This is an excellent solution for an apartment, allowing you not to depend on seasonal blackouts and other inconveniences.

Electric boiler Vaillant Ecoblock

Electric boiler Vaillant Ecoblock An electric boiler Vaillant Ecoblock with a capacity of 6 kW and efficiency of up to 99% works for heating and hot water supply of the entire apartment. It has a wide range of temperature settings for both heating and hot water supply. There are frost protection and 2-level overheating protection. Equipped with eBus data transmission technology. With the help of a capillary thermostat, residents can smoothly regulate the heating temperature in the range from 25 to 85 ℃

Expansion tank Zilmet

The Zilmet expansion tank is designed to compensate extra pressure in the heating system. Works in conjunction with the Vaillant electric boiler above. The special inner lining of the tank prevents the growth of any bacteria, that is, the water does not acquire a metallic taste, does not stagnate or change its properties.

Refiner Ecowater - water softening and filtration system

A modern system for filtering and softening water: cleans water from all kinds of impurities and odors, neutralizes iron, making it soft, pleasant and safe for household appliances, water pipes and human use. The purified water is also suitable for drinking directly from the tap. The refiner does not require changing the carbon filters, and is controlled via WiFi - maximum automation and comfort!

A complex of engineering systems in an apartment, Lipskaya street, Kyiv


  • Analysis of the current situation
  • Specification
  • Design
  • Sewerage installation
  • Commissioning
Analysis of the current situation

Analysis of the current situation

Specialists listen and assess the possibility of implementing the wishes of the client at the facility with which to work, and offer alternative solutions to improve the efficiency of the sewerage system.



Drawing up a detailed list and calculation of the cost of the work required at the facility. The calculation includes the materials and equipment recommended by the specialists of our company, available for the client's budget.



Alter Air engineers draw up a three-dimensional plan for water supply and sewerage systems: a clear layout of pipes, plumbing, water treatment facilities with exact location, diameters, sizes and other details.

Sewerage installation

Sewerage installation

Installation of previously agreed systems and equipment: pipes, thermostats, sensors, and other necessary elements. Carrying out commissioning of the system.



In the presence of the client and Alter Air specialists, the final launch and commissioning of the equipment takes place - a demonstration of the effective operation of the interconnected water supply and sewerage systems.

Video reviews

Implementation of heating and water supply systems in a private house 240 m2, Riviera Village
Implementation of heating and water supply systems in a private house 240 m2, Riviera Village
Overview of drawings and solutions for ventilation, air conditioning, water supply and sewerage in a house of 380 m²
Overview of drawings and solutions for ventilation, air conditioning, water supply and sewerage in a house of 380 m²
All internal climatic systems in an apartment - from ventilation to water treatment - Kyiv, Lipskaya street
All internal climatic systems in an apartment - from ventilation to water treatment - Kyiv, Lipskaya street
Heating, water treatment, air conditioning, ventilation and WSS in the house, Riviera Villas, Lebedevka
Heating, water treatment, air conditioning, ventilation and WSS in the house, Riviera Villas, Lebedevka


How to make a sewerage project?

The project must be drawn up at the construction stage of the building. It must consider the characteristics of the territory, structure and comply with existing building codes. This is a difficult task, as it requires special knowledge, so we recommend ordering a sewerage project and sewer installation in Kyiv from Alter Air specialists.

What should be considered when designing a sewerage system?

When designing sewerage, it is necessary to consider:

  • where the waste will be discharged (to the central sewer, septic tank or cesspool);

  • what volume of drains the sewerage should be calculated for;

  • features of the territory;

  • where and what plumbing fixtures will be installed to correctly position the drains and select the required diameter of the water pipes.

Is it possible to make a sewerage system without a project?

We do not recommend starting sewerage installation without a final project. In the best case, improper design of sewerage networks will entail additional costs at the stage of its installation, for example, due to lack of materials. In the worst case, the lack of a plan will cause it to malfunction and the prospect of failure at any time due to excessive workload.

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