Analisis Akurasi Perhitungan Rab Metode (Kasar Per Meter Persegi) Vs Metode Detail (Volume Kontruksi) Studi Kasus: Kota Palopo

Abstract

Accurate cost estimation is a key factor in the success of simple house construction project management. This study aims to analyze the accuracy of the rough method Cost Budget Plan (RAB) based on area (per square meter) compared to the detailed method based on volume analysis and unit price analysis (AHSP). The case study was conducted on a type 36/72 residential house in Wara Barat District, Palopo City. The research data includes technical drawings, surveys of local material prices and labor wages for 2026, as well as supporting regulations such as PUPR Ministerial Regulation No. 8 of 2023 and SE DJBK No. 68/SE/Db/2024. Using a comparative descriptive method, the analysis showed that the rough method with a unit cost standard of IDR 3,500,000.00/m² resulted in an estimated cost of IDR 126,000,000.00, whereas the detailed method yielded IDR 138,450,000.00. A cost deviation of IDR 12,450,000.00 (9.00% underestimated) occurred, giving the rough method an accuracy level of 91.00%. The primary causes of this deviation are fluctuations in reinforced concrete structures and land preparation work, which are not detailed in the square meter rate. Nevertheless, because the deviation falls within the construction management tolerance limit (±10% to ±15%), the rough method is considered efficient and suitable for early conceptual planning, provided it is followed by detailed calculations during physical execution.