Building Coverage (BCR) and Floor Area Ratio (FAR) —
Calculation Rules and Gross Floor Area Exemptions

Horizontal Boundaries vs. Vertical Volume Limits

These two primary development metrics govern entirely distinct spatial dimensions[cite: 20]. Building Coverage Ratio (BCR) limits the maximum horizontal footprint area a building can occupy over a plot, while Floor Area Ratio (FAR) regulates the cumulative sum of all above-ground interior floor surfaces relative to the total site area[cite: 20]. If BCR defines the horizontal partition of space, FAR sets the ultimate vertical density threshold[cite: 20].

Let us assume a 100-pyeong lot (approx. 330㎡) falls under a 60% BCR ceiling and a 200% FAR cap[cite: 20]. A single floor footprint can cover up to 60 pyeong maximum, while the total aggregated above-ground area can reach up to 200 pyeong[cite: 20]. Utilizing a maximum 60-pyeong footprint allows a 3-story massing configuration, whereas shrinking the footprint to 50 pyeong opens the path to a 4-story profile[cite: 20].

Exemption Provisions as Core Architectural Strategy

Even under identical FAR constraints, the final real-world yield shifts based on design execution[cite: 20]. Because underground levels and open ground-floor parking configurations do not subtract from your legal FAR allowance, executing vehicle layouts via a pilotis approach preserves your development allowance for upper residential tiers[cite: 20]. This exemption is the reason why ground-floor pilotis parking has become the structural standard for multi-household residential types throughout metropolitan urban plots alongside vertical height limits[cite: 20].

Similarly, a precise basement classification becomes the primary leverage point on sloped topography[cite: 20]. Proportional grade modeling can determine whether an accessible commercial storefront is legally recognized as a basement, and once achieved, that retail square footage is completely omitted from municipal FAR tracking[cite: 20]. Our planning proposal for the Shindae-jigu officetel development in Yongin leveraged this framework, grouping retail spaces into a legal basement profile to free up maximum volume for upper premium units[cite: 20]. View Our Complete Portfolio →

Where to Verify Your Plot Regulations

The baseline boundaries for BCR and FAR allocations are defined by the National Land Planning Act based on zoning designations, with specific metrics locked in by local municipal ordinances[cite: 20]. While basic lookups can be completed via public portals like 토지이음 (eum.go.kr), sites located within Special District Unit Plans or Growth Management Zones follow separate, overlapping development codes that take precedence[cite: 20]. If you are assessing a site for an active real estate transaction, commissioning an architectural feasibility study containing a code compilation is the most secure path[cite: 20].

Frequently Asked Questions

Q. What is the primary difference between BCR and FAR?

Building Coverage Ratio (BCR) mandates the structural footprint over the site area (defining 'how wide' a building covers the dirt), whereas Floor Area Ratio (FAR) regulates the total accumulated above-ground floor area relative to the site area (defining 'how tall' the building volume can be)[cite: 20]. On a 100-pyeong lot with 60% BCR and 200% FAR, a single floor footprint can extend up to 60 pyeong, while the total combined above-ground area can reach up to 200 pyeong[cite: 20].

Q. What specific areas are excluded from legal FAR metrics?

Total basement areas, above-ground floors dedicated entirely to accessory parking structures (including open pilotis layouts), designated community center facilities, and mandatory structural refuge zones are fully excluded from the gross floor area used to evaluate FAR compliance[cite: 20]. Harnessing these provisions increases marketable space[cite: 20].

Q. What should be audited prior to executing a property purchase?

You must verify specific municipal building ordinances, overlaid development zone requirements, and a corresponding conceptual massing study[cite: 20]. LEA Architects delivers specialized land analysis and feasibility studies inside the Yongin region[cite: 20]. Consult for Land Analysis →