Comparative Analysis of the Costs (RAB) Budget Development Project in Surabaya

In the construction of a building, one of which is a mosque, it does require efficiency on the budget plan, so that development can be completed to the maximum with optimal time and little cost. The purpose of this study is to find out the ratio of labor wage coefficients between the Budget Plan (RAB), BOW and Implementation; Knowing the comparison and the difference in the number of unit prices of labor wages; Find out the cause of the difference in price. Data processing is done by literature method, documentation, conducting field observations and conducting interviews. The results of the work include formwork column K1 (thread D19) foreman coefficient ratio in RAB Offer with Implementation that is equal to 1.21, while BOW with Implementation is 0.37. Then for the wages of reinforced concrete deck work Lt. 2 12cm thick K-250 with an area of 41.05 m3 the difference between the RAB of the Offer and the Implementation of Rp. 36,263,855.91 (64.4%), while the difference between BOW and Implementation is Rp. 138,619,043.82 (87.4%). The magnitude of the ratio of ratios and differences in the budget for wage costs is influenced by many factors: labor wage prices, quantity or amount of labor used in the project, skill level and age of the workforce, and high interest in workforce employment.


I. INTRODUCTION
The purpose of planning a building is to get a strong building construction, in terms of construction and development costs are cheaper and do not rule out the beauty of the building. One of them in planning the construction of mosques, construction and construction costs must be considered. Therefore the Budget Plan (RAB) must be more accurately and accurately calculated, to obtain strong construction for the next few years. Baitul Makmur Mosque UNESA Surabaya is a mosque that is within the UNESA and managed by UNESA. In connection with the growth of the population accompanied by the growth in the number of students conducting academic processes, every year the number of UNESA students increases. So that in 2014, UNESA had already drafted the development of the Baitul Makmur Mosque and was realized in 2018.

Scope of problem
1. The research object will be carried out on the UNESA Baitul Makmur Mosque construction project 2. Calculation of wage coefficient and total unit price of labor wage work include: column structure work and plate structure of deck floor 2 3. This study only compares the index of labor wage coefficients and the total unit price of labor wage work based on the RAB of Bid, BOW and Implementation in the field.

II. LITERATURE REVIEW
A complete and meticulous project budget plan is a budget plan made by the contractor as the implementation of the work. This is understandable because the contractor wants to get a job with a reasonable profit. In general, the project RAB component consists of direct costs and indirect costs (Dani Hasan, H.S & Suryanto Mas, 2003:114-119).

Analysis SNI (Standard National Indonesia)
Analysis SNI (Standard National Indonesia) is an analysis which is the result of research conducted by experts in the center of settlement research and development as one of the government provisions in Indonesia in supporting the efforts of both central and regional governments in streamlining development funds as well as formulations for determining the unit price of each type of work.

Analysis Price of Field Units
According to Suryaningrum (2012), cost estimation is the process of calculating the volume of work, prices of various types of materials and work that will occur on a construction. Because estimates are made before the start of construction, the total cost obtained is estimated not the actual cost.
To determine the magnitude of the coefficient unit of labor wages, we need to pay attention to the basic assumption values. In determining the size of the wage coefficient there are a number of things to know about: a. Work productivity (work results) The productivity formula defined by Suyadi (2009)

IV. RESULTS AND DISCUSSION
The main objective in this study is to find out what method is most suitable for the UNESA Baitul Makmur Mosque Construction Project.

Results of Labor Productivity Analysis
When conducting a productivity calculation analysis, data collection and observation of each work in the field will first be carried out. These data include work volume of work items, length of observation in 1 day working hours, amount of area that can be completed, and the number of workers involved in implementing each item of work in the field. Job items obtained during observations in the field :

Comparison of Workers' Wage Coefficients between RAB Offers, BOW and Implementation
The following is the analysis of the work unit price coefficient index in 2018 on the construction project of the Baitul Makmur Unesa Mosque, Surabaya.