It is necessary to calculate the cost of work and materials before electrical wiring in an apartment or a private house and for settlement with the customer after the work has been completed. Estimates are needed for clarity and so-called transparency in the calculations of an electrician with a customer.
The estimate for the power supply of a private house or apartment consists of a local estimate for the cost of completed electro installation work and the cost of electrical materials.
First, a preliminary estimate for electrical work and the materials necessary for installation are considered. It is possible to make a preliminary calculation of the estimate at the facility, during the first meeting with the customer. It is performed on a tablet, in the field - at a construction site, and therefore it must be understood that inaccuracies are possible. But the order of amounts for work and materials will be correct, that is, changes at times are excluded.
The most accurate calculation is possible when working at a computer, after the drawing is made. On the architectural plan object, the placement of sockets, switches and lamps is done, then junction boxes are applied, the location of the junction boxes may change during installation, but their number will most likely remain the same.
After all calculations are completed, the electrician's estimate for work and materials, along with the drawing, is provided to the customer, usually sent by e-mail.
The second stage of work with estimates is to fill in the estimate with accurate data, all this is done during the wiring process.
After all electrical installation work is completed, a general calculation is made and a ready, completed estimate is provided to the customer.
For example, a sample estimate for the power supply of a private house is presented, the total area is about 130 square meters. The purchase of sockets, switches and lamps is usually carried out by the customer.
Drawing up an estimate, a sample of which is presented in Excel format, consists in filling in the corresponding cells, in the corresponding rows and columns.
The estimate consists of three main sheets. The first sheet is a sheet with the main calculations between the contractor, represented by an electrician, and the customer, represented by the owner of the house or apartment. This sheet shows discounts, as a percentage and in rubles. Also, the total amount for the work performed without discounts is shown, total amount discounts and the total amount for the work performed with discounts.
The second sheet is an estimate for all electrical and repair work. The estimate consists of lists of works of the three main components of electrical installation in a private house or apartment: the first part is the installation of electrical wiring, the second part is the installation of switchboards and automation, the third part is installation work, that is, work on the installation of sockets, switches, lamps and other wiring products or devices. And repair work - such work is possible at facilities where the "masters" have already worked.
The third sheet is an estimate for materials, usually a preliminary estimate for electrical materials for installation and installation. It consists of three parts. The first part contains a list of electrical materials for the installation of electrical wiring, the second part consists of a list of materials necessary for the installation of switchboards and automation. And in the third part of the estimate, a list of materials for installation work is presented.
For each object, a new estimate is drawn up, while adding the necessary, additional positions or removing unnecessary positions.
The example shows a preliminary estimate for the installation of electrical wiring, shields and automation, without the installation of sockets, switches and lamps, and a preliminary estimate for materials.
A drawing for calculating an estimate is not a house power supply project. It is done on one sheet for clarity and convenience when calculating estimates. All drawing work, at the preliminary stage, is performed as additional work in the calculations. It takes time to make a project, and at this stage there is no clarity in the intentions of the customer and it is necessary, as soon as possible, to calculate and provide the customer with an estimate with all the costs of electrical installation, and clarify the intentions!
I would like to mention one important point- Drawing up, calculation of the estimate is work. But, almost always the cost of this work is included in the discount. This must be remembered!
Before proceeding to the installation of electricity in the house, you need, as well as an estimate for materials. This is necessary in order to calculate the approximate (or even exact) costs and during the electrical installation not to face a situation where there is not enough money for sockets or switches. Based on the prepared cost table, you can understand whether there are enough material resources or it is better to purchase cheaper materials in order to surely get away from shortage problems. Next, we will tell you how to make an estimate for electrical work by providing step by step instructions with video as well as a sample.
The first step is to prepare the documentation on the basis of which the estimate for electrical installation will be drawn up. For calculations, you need to collect the following documents:
In addition, depending on the situation and the characteristics of the object, an act of balance affiliation, a document on the limitation of operational responsibility, as well as an order for the supply of electrical equipment. All these documents are mostly used in enterprises. As a rule, in order to draw up an estimate for electrical work in a residential building, it is enough to prepare the first 2 documents from the list, as well as a permit for electrical installation.
Calculating the cost of installing electrical wiring is not too difficult, but you will have to take this procedure seriously enough. The more points indicated in the estimate, the less likely that at the end of the electrical installation there will be situations due to which you will have to overpay. So, drawing up an estimate for electrical work consists of the following steps:
If, after you make an estimate for, it turns out that there is not enough money, you will have to reconsider the project and, if possible, either remove some electrical points or purchase cheaper materials.
This manual is suitable for those who want to independently calculate the cost of installing electricians. If you doubt that you can correctly draw up an estimate of electrical work, it is better to entrust this matter to specialists, but they, of course, will take money for this. Another important point is who will perform the electrical installation. Would you like to do your own wiring? own house? Then you skip this moment. If it is understood that the electrician will be carried out by a company or a private electrician, it is necessary to find out what the cost of electrical installation will be, as well as the dismantling of the old network (if the apartment is not a new building) and be sure to include this figure in the estimate.
Please note that many companies offering electricity services have their own online calculators on their websites, with which you can quickly calculate the cost of electrical installation. In the same place, as a rule, you can find prices for the installation of certain electrical points (sockets, switches, meters), cable laying and wall chasing for wiring. This information will allow you to easily calculate the cost of electrical work at the new prices.
It should also be noted that estimates are complex (for the entire facility) or local (for a separate room / room).
Make a cost plan best in the program Microsoft Excel. All you need is to download this program to your computer, install and create a table in it. Next, enter all the values \u200b\u200bin the table, after which, based on the formulas, make calculations. How the estimate for electrical work in Excel is prepared is clearly described in the video example:
Sample of settlement works
Well, the last thing I would like to provide is the estimated prices for the installation of electricians in residential premises. So, in 2019, the cost of electrical installation is as follows:
These are the main prices for electrics, which we recommend focusing on when drawing up an estimate for electrical wiring work. In general, excluding the price of materials, the cost of electrical installation in 2018-2019 will be (in rubles):
Price list example:
That's all I wanted to tell you about how to make an estimate for electrical work in an apartment and house. We hope that our instructions were useful and understandable for you.
1. Reconstruction of SS 110/35/10 kV
Construction of the foundation for the reactor RTDU 25000/110
Purchase and installation of outdoor switchgear-110 kV
Purchase and installation of relay protection and automation equipment
Diagnostics of memory and electromagnetic compatibility
Rigging USHR RTDU-25000/110
Transportation and rigging of CSR RTDU-25000/110-UHO1 from the railway station to the substation at a distance of 12 km
2. Construction and installation works of VL-0.4 kV, construction length 0.372 km.
3. Construction and installation work VLI-0.4 kV Lstr. = 0.9 km
4. Construction and installation work VLI-0.4 kV, construction length 2.447 km.
5. Construction of VLI-0.4 kV joint suspension with VLI-10 kV Lstr. = 0.2 km.
6. Construction of VLI - 0.4 kV, from the designed KTP Lstr. = 0.9 km.
7. Installation of KTP-160-10/04 kVA with transformer TM-160 kVA.
8. Construction of VLI-0.4kV joint suspension with VLI-10kV Lstr.=0.22 km.
9. Construction and installation work VLI-0.4 kV. Str. length - 0.18 km.
10. Construction of VLI -0.4 kV from the designed KTP. Lstr.=0.21km
11. Construction and installation work VLI-0.4 kV. Str.length - 0.33 km.
12. Construction and installation work VLI-0.4 kV. Str.length - 0.38 km.
13. Construction and installation work VLI-0.4kV.tCtr.l.-0.585 km.
14. Construction and installation work VLI-0.4 kV. Str.length - 0.48 km.
15. Arrangement highway Orenburg-Belyaevka artificial lighting.
Composed of:
Overhead line 10 kV
Construction of KTPNM-63-10/0.4-97U1-V/K
Outdoor electric lighting
16. Collection of prices for APCS and RPA equipment
17. Laying of cable lines 0.4 kV from DGU to the data center premises
18. Reconstruction of VL-0.4 kV No. 1 from KTP-206/100 kVA. Composed of:
VLI-0.4 kV
VLZ-10 kV
KTP-10/0.4 kV with a capacity of 160 kVA
19. A set of 12 estimates for the construction of a 6 kV overhead line, 0.4 kV VLI.
20. Reconstruction of SS 110/10/6 kV with replacement of tank MV 110 kV with SF6 circuit breakers 110 kV. Composed of:
Architectural and construction solutions
Power supply and electrical equipment
Relay protection and automation
Commissioning and measurements.
21. External power supply of electrical installations of the 1st stage of construction of a residential microdistrict. Composed of:
Cable line 10 kV
Cable line 0.4 kV
Overhead line 0.4 kV
KTP-400kVA
2KTPNU-400kVA
PNR 2KTPNU-400kVA
22. Reconstruction of RPA PS. Composed of:
MTRiO for the object "Reconstruction of the relay protection and automation equipment of the substation"
Construction and commissioning works on the object: Installation of arc protection at substation NS-3
Construction and commissioning works on the object: Installation of arc protection at substation NS-2
Construction and commissioning works on the object: Installation of arc protection at substation NS-1
Construction and commissioning work on the object: Installation of arc protection at the substation
Construction and commissioning work on the object: Installation of individual arc protection on alternating operational current
Construction and commissioning of the facility: Installation of group arc protection at the substation PO ZES Sh-33
Construction and commissioning of the facility: Installation of group arc protection at the substation PO ZES Sh-32
Construction and commissioning works for the facility: Installation of group arc protection at the substation PO ZES N-22
Construction and commissioning works for the facility: Technical re-equipment of the T-11 substation in terms of replacing emergency oscilloscopes N-13 with microprocessor-based emergency event recorders
Construction and commissioning works on the object: Technical re-equipment of the substation in terms of installation of devices for determining the location of damage on the 110 kV overhead line type IMF-3R
Construction and commissioning works on the object: Technical re-equipment of Substation B-3. Installation of arc protections on 10 kV busbars (atypical scheme of 2 busbar systems of 4 sections) not equipped with high-speed protections.
23. DC shield and batteries SS 110/6 kV
24. Reconstruction of VL-0.4 kV (SIP) from KTP. Composed of:
Removal of the route VL-0.4 kV (SIP) L=4.729 km in nature
Gas pipeline protection
Reconstruction of VL-0.4 kV (SIP)
25. Reconstruction of 110 kV substation (in Grand Estimate and Excel formats)
26. Construction of a 10 kV overhead line and reconstruction of a 10 kV cell at a 110 kV substation.
27. Commissioning of the substation 110/10/6 kV with CL-110 kV and cells 110 kV. Composed of:
Commissioning works. Electrical equipment of SS 110/10/6 kV
Commissioning works of the complex of relay protection and automation equipment of 110/10/6 kV substation
Commissioning works. Remote control substation 110/10/6 kV
Commissioning works. Electricity measurement and metering systems 110/10/6 kV substation
Commissioning works of ASKUE SS 110/10/6 kV
Start-up and adjustment works of APCS
Commissioning works of emergency automatics of 110/10/6 kV substation
Commissioning of lifting and transport equipment
Commissioning of ventilation and heating systems of 110/10/6 kV substations
Commissioning works. Security and fire alarm system SS 110/10/6 kV
Commissioning works. Equipment automated system video surveillance substation 110/10/6 kV
Commissioning works. Electric lighting substation 110/10/6 kV
Commissioning works. Communication channels via FOCL at the substation section
Commissioning works. Communication channels via FOCL at the substation section
Commissioning works. Communication channels via FOCL at the substation section
Commissioning works. Communication channels via FOCL at the substation section
Start-up and adjustment works of emergency automatics of 110/35/6 kV substation
Commissioning works. Electrical equipment of SS 110/35/6 kV
Commissioning works of the complex of relay protection and automation equipment of 110/35/6 kV substation
Commissioning works of ASKUE SS 110/35/6 kV
28. Reconstruction of a 0.4 kV overhead line
29. Reconstruction of VL 10 kV, VLI 0.4 kV, KTP
30. Reconstruction of VLZ-10 kV, VLI-0.4 kV and TS 10/0.4 kV
31. Reconstruction of the 0.38 kV overhead line with the installation of an additional KTPK
32. Reconstruction of 110/35/10 kV substation in Grand Estimate and Excel formats
33. Reconstruction of PS 110/35/10. Composed of:
Vertical layout
Territory fencing
Special construction works by PS
Installation of the ground loop and lightning protection
Installation of equipment outdoor switchgear-110 kV, switchgear-10 kV
Outdoor lighting of the substation territory
Installation of relay protection and automation equipment
Installation of AIIS KUE devices at the substation
Installation of HF communication equipment at Substation 110/35/10
Purchase and installation of telemechanics devices
Double-circuit entry VL-110 kV
Removal of CL-10 kV from the construction area
Installation of telemechanics equipment
34. Reconstruction of SS 110/6 kV
35. Reconstruction of the repair and production base of RES
36. Estimates Repair of overhead lines 10 kV, 0.4 kV, KTP, ZTP.
37. Reconstruction of VL-6 kV, KL-6 kV. Composed of:
Staking out the route
Clearing the route VL6 kV
Dismantling works of 6 kV overhead lines
Construction of a 6 kV overhead line
Construction of 6 kV overhead lines and cable lines
Retrofitting of ZTP
Commissioning of 6 kV overhead lines, cable lines and ZTP
38. System polygon "PS 110/35/10 kV with overhead lines 110 kV and overhead lines 35 kV"
39. Electrical work in the premises of the 1st floor of the MOU secondary school (food bowl)
40. Electrical work. Repair of the catering unit MOU SOSH
41. Power supply of the recreation center
42. Power supply of ventilation of the medical unit, block G, laboratory.
43. Calculation of labor costs for the current repair of substation equipment
Estimate - a calculation plan that displays all the upcoming costs for the implementation of a particular project. Drawing up estimates for electrical work- a very time-consuming process that requires a professional approach on the part of the performer. Without this document, it will not be possible to find out the exact amount of expenses for the implementation of certain works. The whole process of budgeting can be divided into several main stages.
There are two types of estimates for electrical wiring and equipment:
In simple words, if you need to calculate the cost of laying, for example, wires in one office or workshop, look for a compilation sample local estimate. But complex calculations will be needed, for example, during the construction of a new facility or during its comprehensive repair.
So, before starting any calculations, it is necessary to collect a certain package of documentation, which includes:
The listed documents must not only be collected, but also carefully studied the information presented in them. Particular attention should be paid explanatory note and power supply plan.
After collecting and processing all official information about the object, the estimator must determine whether the forthcoming costs are justified. The specialist will be able to answer this question only after he gets acquainted with the current tariffs for each type of upcoming work. It is also necessary to compare the actual conditions in which the electrical installation will be carried out with the information submitted on paper.
After the equipment costs are calculated, compare them with the amount included in the project budget. If the waste exceeds what was planned, look for similar equipment options at a lower price.
An important stage in the preparation of estimates is the choice of a contractor company providing electrical installation services. Your opinion about the organization should be formed not only by dry calculations of the cost of services, but also by reviews of previous clients. The costs of finding a contractor and making an agreement with the workers are also included in the estimate.
After collecting and processing all the information, it comes time to draw up the final estimate, which can be of two types:
It is easy to guess that a better, more complete and useful estimate will be drawn up on the basis of a larger number of documents and taking into account all the nuances of specific electrical work.
The range of works that should not be missed in the estimate
Be sure to take into account the cost of labor for installers in the estimate. Without these data, information on project costs will be considered incomplete. In addition, do not forget to write the following works in the official document:
Let us consider in more detail the structure of the local estimate for cable laying. On the title page the document must indicate the date of its compilation, as well as the initials of those officials with whom it was agreed and approved. In addition, the name of the construction site where the electrical work will be carried out should be written.
The above information should be placed in two columns, one of which indicates base price, and the other one is the current one.
You also need to specify the date on which the prices of works and equipment were calculated. You can designate this information, for example, with the following phrase: "The estimate is made in prices for June 2017." All other information of the document will be presented in a schematic form. In the so-called "header" of the table, the following columns should be indicated:
Such an estimate may consist of several sections (categories), into which it is conditionally possible to “sort” all electrical work. For example, manipulations for the dismantling of old devices will be placed in the first section, and work on wiring and connecting the cores of new wires - in the second.
At the end of the document, it is necessary to indicate the total amount of costs for the implementation of electrical work, indicate the name of the contractor and the verifier of the estimate, and then certify the document with their signatures.
As you can see, budgeting is a complex and multifaceted process. It is important not only to have the skills of financial calculation, but also to know the basics of electrical installation, otherwise the estimator will not be able to deal with the entire list of works and features of professional equipment. That is why specially trained personnel, professional estimators are in demand, which enterprises hire to perform various kinds of calculations and draw up financial reporting for upcoming electrical work.
To find the right approach to budgeting for electrical installation, you should start with the order of work. When an electrician is carried out in an apartment, then all work is divided into two stages:
The markup, in turn, includes:
Direct installation includes the following steps:
In general, the entire electrical installation in the apartment can be divided into:
The estimate for the electrical installation of an apartment consists of two parts - the cost of the work of electricians and the cost of basic and consumable materials. Includes the following items: electrical appliances for various purposes, cables and wires, fasteners, switchboard equipment, lighting electrical appliances, consumables, etc.
Another important nuance . Unlike general construction estimates, the estimate for the electrician does not provide for a certain supply of necessary materials. It is assumed that everything will be purchased as needed directly during installation.
You can consider marking each stage separately.
Dismantling . It includes the dismantling of old sockets and switches, and, if necessary, the removal of old or failed wiring.
When preparing estimates for dismantling items, estimators use prices from the collections GESNr-67-(01-05), FERr-67-(01-05) and TERr-67-(01-05), although many also use prices for installation, multiplying them by the coefficient K = 0.3.
wall chasing . To mark these works, prices from the collections of ENiR 46-03-012 or from the repair collections of GESNr-69, FERr-69 and TERr-69 are suitable in positions relative to cutting holes in the walls manually or using mechanisms.
Laying cables and electrical wiring . Cable laying is carried out either openly - in boxes, or hidden - under plaster or above suspended ceilings, in a way. For apartments, the second method is considered the most aesthetic and safest. But it has one significant drawback - if the wiring is damaged, it will be difficult to quickly replace it, you will have to lay a new one.
For positions for laying cables and wires in apartments, prices from the collections GESNm-08-02-(395-422), FERm-08-02-(395-422), TERm-08-02-(395-422) are applied.
Installation of electrical equipment . This section includes the installation of sockets and switches, as well as the connection of lighting fixtures, junction boxes, meters, and the replacement of group shields.
For these works, prices from the following repair collections GESNr-67-(05-15), FERr-67-(05-15) and TERr-67-(05-15) are used. Or GESNm-08-03-(591-594), FERm-08-03-(591-594), TERm-08-03-(591-594).
Connecting cables . The wiring and connection of conductors of cables or wires can be found in the collections GESNm-08-03-574-(01-09), FERm-08-03-574-(01-09), TERm-08-03-574-(01- 09).
Commissioning works. All types commissioning, produced in residential buildings, such as measuring resistance or voltage, checking grounding, monitoring insulation, etc., can be found in the collections of prices for commissioning and commissioning GESNp-01, FERp-01 and TERp-01.
Depending on the number of rooms in the apartment, the cost of electrical installation differs only in the amount of work, as well as in the amount of materials used in the installation.
According to the standard, the following number of electrical appliances installed in a one-room apartment is required:
Prices for types of electrical work differ depending on the material of the walls - they are higher for concrete than for brick. The standard volumes for some work for a one-room apartment are as follows:
Some other types of additional prices are added to the estimate, for example, for dismantling, for electric lighting, connecting fans, meters, calls, etc.
For a two-room apartment, the number of sockets for rooms is already taken as 10, instead of 5, and the number of switches and junction boxes becomes 6. The approximate amount of electrical work for a two-room apartment will be as follows:
When preparing an estimate for electrical installation three-room apartment the required number of sockets for rooms will be 15, and the number of mounted switches with boxes will be 7. The following volumes are already taken for electrical installation:
Prices can be taken from the collections above. The bulkhead of the shield on the stairwell is the same for a different number of rooms. It should be remembered that when marking the costs of electrical installation in an apartment, you must first divide it into four blocks:
Prices for the materials used are taken from the collections of SCM, TSC and FSNB or according to price lists.
Download an example of an estimate for electrical work in an apartment -
