What Is "Total Property Size"?

Total property size usually refers to the internal floor area of your home (the space inside the walls, across all floors). It's often shown in square metres (m²).

Buyers and tenants use it to compare homes, and it often supports pricing, valuations, and search filters.

This guide shows you a practical way to estimate total floor area, what to include or exclude, and how to present it clearly on a Virify listing.

Key takeaways

• Total property size = internal floor area, not plot size.
• Be consistent and label estimates as approx. unless professionally measured.
• Measure each floor separately, then add them together.

Measuring Land Size (plot/garden),

Measuring Room Size

Understanding Floorplans(often includes internal area)

Total Property Size vs Land Size vs Room Size

Total property size is different from:

• Land size / plot size (total outdoor space)
• Room size (individual room dimensions)

Before You Measure: Check Existing Sources

You may already have a usable floor area figure.

Best quick sources to check first:

• EPC (often includes a "total floor area" figure, if it's up to date)
• A previous floorplan (if it's recent and still accurate)

How to Measure Your Property Size

The best way is to go outside and using a tape measure or laser measurer, take a measurement of the length and width of your property (the building itself).

For simple rectangles:

1. Measure length and width (in metres if possible)
2. Multiply: length × width = area (m²)

Example: 4.0m × 6.0m = 24.0m²

If you cannot measure from the outside of your property, measure the inside and add the thickness of the walls to the measurements (if known).

Step 2: Do upper floors separately

Upstairs may not have exactly the same footprint. Consider:

• stair voids
• loft rooms
• extensions only on ground floor
• split-level layouts

Measure it separately.

Step 3: Add the floors together

Total internal floor area = ground floor + first floor + second floor (etc.)

Uneven-Shaped Properties (L-shapes, bays, extensions)

The simplest approach

1. Sketch the floor shape roughly
2. Break it into 2–4 rectangles
3. Calculate each rectangle's area
4. Add them up

If you need triangles

If part of the shape is a triangle:

• Area = (base × height) ÷ 2

What's Included and Excluded

This is where most confusion happens. Different sources measure slightly differently, so the key is to be clear.

Often included (if part of the main home)

• internal living areas across all floors
• areas occupied by internal walls
• conservatories (if permanent and connected)
• integral garages sometimes (if they're part of the main structure)

Often excluded

• outbuildings, sheds, detached/non-integral garages
• balconies, terraces, patios, gardens
• loft space without a conversion / fixed access
• communal/shared areas (flats: hallways, stairs, lobbies)