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KDB, KLB, KDH & GSB Calculator
Know the maximum you may build on your land per KDB, KLB, KDH, and GSB zoning — a basis before designing a home or buying land. Free.
Must be checked against the RDTR
These values differ by zone/region — check the local spatial plan (RDTR) or planning office.
What you may build
An early-planning estimate; final design & permit compliance (PBG) should be done or verified by a competent architect/engineer.
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Understanding the zoning terms
KDB (Building Coverage Ratio)
The maximum percentage of land the building may cover at ground level. KDB 60% on 120 m² means at most 72 m² is covered by building; the rest must stay open.
KLB (Floor Area Ratio)
A multiplier of land area for the total floor area across all floors. KLB 1.2 on 120 m² means total building (all floors summed) is at most 144 m². KLB ÷ (KDB as a ratio) estimates the number of floors.
KDH (Green Area Ratio)
The minimum percentage of land that must be green/water-absorption area. It aids drainage and neighborhood comfort; set differently per zone.
GSB (Building Setback Line)
The minimum setback of the building from the road (or river/rail) boundary. The area between the land edge and the GSB can't be built over — usually a carport, front garden, or open terrace.
FAQ
Frequently asked questions
How do I calculate KDB and KLB?
Max ground floor area = KDB% × land area. Max total building area = KLB × land area. On 120 m² with KDB 60% and KLB 1.2: ground floor max 72 m², total building max 144 m² — roughly 2 floors.
Where can I find my land's KDB/KLB values?
KDB, KLB, KDH, and GSB are set per zone via the RDTR/RTRW and DIFFER by region, even by road segment. Check the local spatial plan, planning office, or PTSP/PBG service. The calculator's defaults are only a starting point, not an official value.
How do I estimate the maximum number of floors?
Divide KLB by KDB (as a ratio), then round down. KLB 1.2 and KDB 60% (0.6): 1.2 ÷ 0.6 = 2 floors. It's an estimate; building height may also be capped by other rules like a maximum height limit.
What happens if I build beyond KDB/KLB?
The building permit (PBG) can be denied, partial demolition ordered, or penalties applied. That's why checking these limits before designing or buying land keeps your plan realistic and lawful.
Does GSB reduce the buildable area?
GSB defines a front area that can't be covered by building, constraining where the mass sits — though floor area is still capped by KDB/KLB. Enter your land frontage width to estimate the front area affected by the setback.
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Luxury Art — Architecture & Interior
The planning is set. Now the design.
The calculator here helps you plan space & massing with numbers. Turning it into a beautiful, functional, compliant design takes an architect — that's where Luxury Art works. We handle architecture design, interior design, working drawings, and PBG permit conformity & processing.
Architecture Design
Floor plans, elevations, and building concepts — turning your space needs into a real design.
Interior Design
Space, material, and lighting concepts so every corner feels premium and comfortable to live in.
Complete Working Drawings
Detailed construction drawings that guide builders & contractors — avoiding costly build mistakes.
PBG Conformity & Permit
A design that respects spatial rules (KDB/KLB/GSB) and is ready for PBG permit submission.
The initial consultation is free with no obligation. We help map out your architecture & interior design needs.