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Internal Area Search by Postcode


As a developer, it is important that you know ‌every detail regarding a property to calculate what it could be worth, help apply for planning permission, determine what sort of funding you are eligible for, and more. Internal area size is one important factor. Using our simple internal area search lookup calculator, you can search for UK properties by postcode, with almost every property in England, Scotland, and Wales accounted for.

Why knowing a property’s area measurement is important

Knowing the internal area size of a UK property can be important for any of the following reasons.

  • Applying for a property development loan or other forms of external funding
  • Applying for planning permission
  • Adhering to building regulations
  • Determining how much a property is worth, or could be worth
  • Calculating energy performance and efficiency

What is the Gross and Net Internal Area?

Gross Internal Area

Gross Internal Area relates to measurements taken up to the internal perimeter walls at every level of the property. This area is not limited to just rooms and includes:

  • Any area what has internal walls or partitions
  • Service rooms such as showers, WCs, and changing rooms
  • Columns and piers (freestanding or with an inward projection from an external wall)
  • Chimney breasts and vertical ducts
  • Stair-wells and lift-wells
  • Tank and fuel storage, and boiler rooms

Areas excluded from the Gross Internal Area measurement are:

  • Open Balconies
  • Fire Escapes
  • Small Canopies
  • Any area that has a headroom that is below 1.5m (excluding the area beneath a staircase)

Net Internal Area

The Net Internal Area refers to all usable space within a property, with measurements taken up to the internal perimeter walls, but only if the area serves a purpose or function.

The Net Internal Area can include:

  • Skirting, moulding, or trunking on perimeter walls
  • Kitchens
  • Any built-in units, cabinetry, and cupboards in a usable space
  • Entrances, halls, and corridors

Spaces that can be excluded from the Net Internal Area measurement are:

  • Toilets
  • Boiler rooms
  • Stair-wells and lift-wells
  • Internal structural walls
  • Areas that house permanent air-conditioning, heating, or cooling units
  • Areas that are controlled by an external authority
  • Any area that has a headroom that is below 1.5m

The average internal area of properties in the UK

Below are 5 of the main property types in the UK and their size in terms of area, helping to give you an idea of what your next property development may measure.

  1. Apartments usually have 1 or 2 bedrooms, with an average area size of  656 sq. ft.
  2. Terraced houses have 2 or 3 bedrooms, on average. Smaller terraces have an average area size of 688 sq. ft, while larger properties have an average area size of 1087 sq. ft.
  3. Bungalows usually contain 1 or 2 bedrooms and have an average area size of 828 sq. ft.
  4. Semi-detached Homes have 3 bedrooms, on average and an average area size of  1033 sq. ft.
  5. Detached Homes usually have 4 bedrooms, with an average area size of 1582 sq. ft.

How to perform an internal area search lookup of a property

Using our simple calculator, just enter the postcode of your property, or a property you are interested in purchasing, and let our bespoke software do the rest.

The software uses Energy Performance Certificate data, provided by the Ministry for Communities, Housing & Local Government. Any property that has been sold in the last decade is‌ likely to be included in the database.

Once you have typed in your postcode and hit the search button, all properties relating to that postcode will be listed. If the search return contains a lot of properties, then you can use the filter options to narrow down the list.

Please note that if an individual property has multiple search results, then you should check the date of each. An increase in internal area may suggest that the property has been extended during this time.