FAR Calculator.

FAR is the total floor area you may build divided by the area of your plot. With a FAR of 3.5 on a 5-katha plot (3,600 sft) you can build about 12,600 sft of floor space across all floors. Car parking up to the required amount and a few service spaces are not counted.

Two numbers are compared. The area-based FAR comes from the DAP density block your plot is in — for example Mirpur 3.4, Dhanmondi 5.0 and Gulshan–Banani 5.5. The road-based FAR comes from Table 5 of the Dhaka Building Rules 2025 and depends on the width of the existing road and what you will build. The lower of the two is your base FAR, which you always get; the higher is the maximum, which you can reach only with incentives such as plot size, a road wider than 30 ft, green building certification or giving land for public open space.

For a flat building on a 5-katha plot in Mirpur (DAP block 9, area-based FAR 3.4) facing a 20 ft road, the road-based FAR is 3.26, so the base FAR is 3.26. The 3–6 katha plot-size incentive (+0.20) lifts it to the 3.40 maximum, which allows about 12,240 sft of floor area. At the 62.5% ground coverage allowed for 4–6 katha plots that is roughly 5.4 floors — usually built as G+6 with car parking on the ground floor.

For a flat or apartment building on a 20 ft (6.1 m) road, the road-based FAR is 3.26 in central Dhaka, 2.52 in outer city areas such as Narayanganj, Tongi and Savar, and 2.32 in other areas. Your final FAR also depends on your area-based FAR and on incentives.

Maximum ground coverage depends on plot size: 70% on plots up to 2 katha, 62.5% on 4–6 katha, 60% on 6–10 katha, falling to 40% above 40 katha. The rest is mandatory open space, and half of that open space must stay unpaved so rain water can soak into the ground.

Parking up to the minimum required is not counted: twice that area is excluded if your road is 20 ft (6.1 m) or wider, one and a half times if it is narrower. Parking built beyond that counts towards FAR.

Flats are allowed from a 1.8 m (6 ft) road, but FAR there is only 1.25 in central Dhaka and no car parking is required. Offices need at least 12 ft, while hospitals, large shops and schools need at least 20 ft.

When neighbouring plots are developed together as one block, the 2025 DAP amendment (Table 3.31) raises the area-based FAR and the number of flats by 15% and the road-based FAR by 0.50 for 20 katha to 2 acres on a 20 ft road (10 katha is enough in Old Dhaka). From 2 to 5 acres on a 40 ft road it is 20% and 0.75, and above 5 acres on a 60 ft road 30% and 1.0. Incentives may then take FAR up to 0.5 above the maximum. In return at least 40% of the block stays open as green space and ground coverage is limited to 40% (45% above 2 acres). The minimum block is 20 katha in unplanned areas, 30 katha in planned areas and 1 acre in outer union areas.

The Bangladesh National Building Code in force is BNBC 2020 (gazetted in February 2021); there is no BNBC 2025. Inside RAJUK’s area the FAR, ground coverage, setbacks and parking come from the Dhaka Metropolitan Building Construction Rules 2025 and the amended DAP, both gazetted on 14 December 2025 — that is what this calculator follows. BNBC still governs structure, fire safety and the occupancy classes of non-residential buildings.

No. The calculator follows the building rules and DAP amendment published on 14 December 2025, but the approved figure also depends on the exact block boundary on the DAP map, the land-use zone, any road widening, height limits near the airport and the shape of your plot. SpaceVerse checks all of these for free before you commit to a design.

It covers RAJUK's DAP area: Dhaka's two city corporations, Narayanganj, Tongi, Savar, Keraniganj, Purbachal and the unions around them. Most of Gazipur city outside Tongi, and Mymensingh, follow their own development authorities' rules — send us your plot details and we will check them.