Calculators
Built-up area calculator
Type in the lot and what stands on it, and see the built-up area as your country counts it, and how much is left within the local plan.
How it is counted
In Ireland the built-up area is counted here as the footprint of the house and its outbuildings, to the outside of the walls. The development plan sets how much of the lot may be covered.
An example
A house 12 m × 9 m on a 800.0 m² lot covers 108.0 m², 13.5% of the lot.
Questions and answers
What is BYA?
BYA (bebygd areal) is how Norway measures how much of a lot is built on: the buildings to their outer wall line, a roof overhang or a balcony reaching more than 1.0 m out (in full, where it is under 5 m above the ground), decks more than 0.5 m above the terrain, and 18 m² for each parking space on the terrain where the plan says so. The municipality’s plan sets the limit, often as %-BYA.
Does a shed or a carport count?
In Norway every building on the lot counts in BYA, a shed and a carport too. Elsewhere this calculator adds their footprint, as most local plans do; check the plan for your lot.
Where do I find what my plan allows?
In the local plan (in Norway the reguleringsplan or the municipal plan), on the municipality’s map service. House Madness fetches your lot from the land register in Norway, the Netherlands and Spain, and counts the built-up area as you draw.
Draw the whole house, free
House Madness counts every room this way as you draw, in 3D, and prints the drawings for the application.