Floor Area Ratio and Lot Coverage Explained

Floor area ratio and lot coverage are the two rules that decide how much, and how tall, you can build on any parcel.

Floor Area Ratio and Lot Coverage Explained

Two numbers quietly govern almost every development: floor area ratio and lot coverage. They sound technical, but they are simply the rules that decide how much building a parcel can hold and how it sits on the ground. Understanding them is essential before buying land or sketching a single plan.

Lot Coverage: The Footprint

Lot coverage measures how much of the parcel the building touches at ground level. It is expressed as a percentage of the total lot area. If a parcel is 1,000 square meters and the regulation allows 60 percent coverage, the building footprint cannot exceed 600 square meters. The rest must remain open: gardens, parking, setbacks or courtyards.

Coverage controls the relationship between built and open space. A low coverage limit keeps neighborhoods green and airy; a high one allows denser, more compact development. It says nothing about height, only about how much of the ground is occupied.

Floor Area Ratio: The Total Volume

Floor area ratio, often shortened to FAR, measures the total built floor area allowed, across all levels, relative to the lot size. An FAR of 2.0 on a 1,000 square meter parcel permits 2,000 square meters of total floor area. How those square meters are distributed is up to the design, within the height and coverage limits.

FAR is the master control on density. It defines how much you can build in total, regardless of how many floors that takes.

How the Two Interact

The two metrics work together, and the relationship is where design begins.

- A **low coverage with high FAR** pushes the building upward: a small footprint rising over several floors, leaving generous open ground. - A **high coverage with low FAR** spreads the building out: a wide footprint with few levels.

Imagine the FAR as a fixed amount of floor area and the coverage as the size of the base you can stand it on. Together they determine the shape the building must take.

A Worked Example

Take a 1,000 square meter parcel with 50 percent coverage and an FAR of 2.0. Coverage caps the footprint at 500 square meters. FAR caps total floor area at 2,000 square meters. Dividing the allowed floor area by the maximum footprint suggests the building needs at least four levels to use its full potential. The regulations have, in effect, sketched the building before the architect has.

Why It Matters for Value

These ratios set the ceiling on what land can yield, and therefore on what it is worth. A parcel with generous FAR in a strong location holds far more potential than its area alone suggests. At Nodo Urbano, reading these limits correctly is the first step in judging whether a parcel can support a viable project, because the regulatory envelope defines the maximum product before any design decision is made.

Read the Envelope First

Before falling for a view or a price, calculate the buildable envelope. Coverage tells you how much ground you can occupy; FAR tells you how much you can build in total. Master both, and you can judge a parcel's real capacity at a glance, long before the drawings begin.