BUA vs GFA vs NFA: The Three Numbers That Actually Determine What You're Paying Per Square Foot
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This essential buyer's guide dissects the critical differences between Built-Up Area (BUA), Gross Floor Area (GFA), and Net Floor Area (NFA) in Dubai real estate. It reveals how these distinct measurement standards significantly impact the actual usable living space and the true price per square foot, empowering buyers to make informed decisions and avoid common pitfalls.
Buyer Guide · Property Measurement
BUA vs GFA vs NFA: The Three Numbers That Actually Determine What You're Paying Per Square Foot
A "750 sq ft" listing and a "750 sq ft" listing next door can represent meaningfully different amounts of actual living space, depending on which measurement standard each figure uses. Here's what each term legally means in Dubai, which one appears on your title deed, and the efficiency-ratio calculation that tells you what you're really paying for.
MARKET DESK5 MIN READPROPERTY MEASUREMENT · BUYER PROTECTION
On Your Title Deed
BUA
Used for FAR & Zoning
GFA
What You Actually Live In
NFA (Net Floor Area)
Typical Efficiency Ratio
70–85%
Why This Matters
Three different area figures can legitimately describe the same Dubai apartment, and each serves a different purpose. The number that actually determines your effective price per usable square foot is the one most buyers never ask for. Knowing which measurement you're looking at — and requesting the one you're missing — is one of the simplest ways to avoid overpaying relative to what you actually get to live in.
Three Measurements
What Each Term Actually Means
BUA
Built-Up Area
The total constructed floor area measured from the external wall surfaces — includes internal walls, columns, covered balconies, terraces and a proportional share of common areas like lobbies and corridors.
Used on: Title deeds, SPAs, DLD registrations, marketing
GFA
Gross Floor Area
The regulatory figure used by Dubai Municipality to control how much can legally be built on a plot — enclosed internal area, tied directly to zoning and Floor Area Ratio limits.
Used for: Planning approvals, FAR compliance
NFA
Net Floor Area (Usable Space)
The actual interior space you can furnish and live in — excludes wall thickness, columns, balconies and shared common areas entirely. This is almost never the number quoted on a brochure.
Ask for: The floor plan, not just the headline figure
The Number That Matters
Calculating Your Real Efficiency Ratio
A worked example on a common Dubai apartment size — this is the calculation most listings never show you.
1-Bedroom Apartment — Price Per Usable Square Foot
Listed PriceSale price as advertised
AED 1,200,000
BUA (Title Deed Figure)The number quoted in marketing
750 sq ft
Price Per Sq Ft (BUA basis)What the brochure implies
AED 1,600
NFA (Usable Space, from Floor Plan)What you actually live in
620 sq ft
Efficiency RatioNFA ÷ BUA
83%
Effective Price Per Usable Sq FtWhat you're really paying
AED 1,935
Development Limits
How GFA Determines What Can Be Built
FAR = GFA ÷ Plot Size
A 10,000 sq ft plot with an FAR of 2.0 permits a maximum 20,000 sq ft of gross floor area across the entire development — a limit developers cannot exceed without regulatory approval.
Analysis
Where Buyers Actually Get Caught Out
Comparison Trap
Never Compare a BUA Figure to a GFA Figure
Since BUA is consistently larger than GFA for the same unit, comparing two properties quoted on different bases makes one look more space-efficient than it actually is — always confirm which measurement each listing uses before comparing.
Regulatory Protection
RERA Requires Both Figures to Be Registered
Developers must register both BUA and GFA with the DLD for every project, and RERA requires accurate area disclosure in marketing materials — buyers can request DLD-approved floor plans to verify official figures.
Off-Plan Risk
Delivered Size Can Differ From Sold Size
If the final handover size differs significantly from what was promised at sale, RERA guidelines give buyers grounds to seek compensation or contract adjustment — but only if you documented the originally quoted figure clearly.
Modification Rules
BUA Can Flex, GFA Cannot
Owners can sometimes adjust elements counted in BUA, like enclosing a balcony, but any change affecting GFA requires prior DLD and Municipality approval — unauthorised modifications risk fines or forced removal.
Common Mistake
Assuming BUA Equals Livable Space
BUA is a legitimate, official figure — but it is not usable space. A 1,200 sq ft BUA apartment can easily contain only 900-1,000 sq ft you can actually furnish, once walls, columns and shared allocations are accounted for.
What to Request
Always Ask for the Floor Plan, Not Just the Number
The only reliable way to know your actual efficiency ratio is to review the DLD-approved floor plan directly — a verbal or brochure-quoted figure alone doesn't show you the breakdown between usable and non-usable space.
Before You Compare Two Properties
Confirm whether the quoted figure is BUA, GFA, or usable space — never assume, and never compare two listings that quote different bases.
Request the DLD-approved floor plan and calculate your own efficiency ratio (NFA ÷ BUA) before finalising a price-per-square-foot comparison.
For off-plan purchases, check your SPA's size deviation clause — know in advance what tolerance is permitted and what compensation applies if it's exceeded.
If considering any modification — enclosing a balcony, extending a room — confirm with the developer or DLD whether it affects GFA and requires approval first.
Closing
The Brochure Number Was Never the Whole Story
BUA, GFA and NFA aren't interchangeable jargon — each answers a different question, and only one of them tells you what you'll actually be able to fit a sofa into. The efficiency ratio calculation takes two extra questions and a few minutes, and it's the difference between a price-per-square-foot comparison that means something and one that quietly misleads you.
This guide is provided for general informational purposes and does not constitute legal or financial advice. Area measurement definitions and regulations are set by the Dubai Land Department, RERA and Dubai Municipality and are subject to change. Buyers should verify official BUA and GFA figures directly through DLD-approved floor plans and confirm current regulations before making a purchase decision.
About the author
Aldrin Thomas
Associate Partner
With over a Billion in closed transactions, Aldrin Thomas has earned a trusted reputation as one of Dubai’s most accomplished real estate advisors. As an Associate Partner at M R ONE PROPERTIES, Aldrin is recognized for his in-depth market knowledge, integrity, and client-first approach, values that resonate with high-net-worth investors, entrepreneurs, and global professionals alike. Specializing in Dubai’s most prestigious neighborhoods, Palm Jumeirah, Dubai Hills, Downtown, and beyond, Aldrin delivers strategic, ROI-focused guidance whether you're buying a trophy home or building a wealth-generating portfolio. Respected by developers and clients alike, Aldrin is a regular presence at exclusive launches, private briefings, and international investor summits. When experience, trust, and results matter. Aldrin Thomas is the name to know in Dubai real estate.
With over a Billion in closed transactions, Aldrin Thomas has earned a trusted reputation as one of Dubai’s most accomplished real estate advisors. As an Associate Partner at M R ONE PROPERTIES, Aldrin is recognized for his in-depth market knowledge, integrity, and client-first approach, values that resonate with high-net-worth investors, entrepreneurs, and global professionals alike. Specializing in Dubai’s most prestigious neighborhoods, Palm Jumeirah, Dubai Hills, Downtown, and beyond, Aldrin delivers strategic, ROI-focused guidance whether you're buying a trophy home or building a wealth-generating portfolio. Respected by developers and clients alike, Aldrin is a regular presence at exclusive launches, private briefings, and international investor summits. When experience, trust, and results matter. Aldrin Thomas is the name to know in Dubai real estate.
