UNRAVELING THE 5-FOOT Law in Loft Conversion

How does ceiling height impact the usable space in rooms with sloping ceilings? This informative piece aims to demystify the process of determining the liveable area in rooms characterised by sloping roofs or ceilings, particularly in loft conversions. While loft conversion designs may appear expansive on plans, their real-world utility can be significantly influenced by certain factors. Continue reading for a detailed exploration.

KUN ARCH COLLABORATES WITH OUR CLIENTS TO CREATE OPTIMAL DESIGNS FOR LOFT CONVERSIONS, ENSURING COMPLIANCE WITH LIVING SPACE REGULATIONS.

“MY LOFT SPACE SEEMS SPACIOUS IN THE DRAWINGS, BUT IT’S NOT AS LARGE AS I THOUGHT. WHAT HAPPENED?”

CALCULATING PERMISSIBLE FLOOR AREA:

To accurately determine a room’s floor area from drawings or during the design phase, the following measurements must be taken into account:

Room with a Sloping Roof or Ceiling:
Exclude the area where a sloping roof or ceiling reduces the room’s height to less than 1.524m (5 feet) when calculating the floor space.
Include Area:
Include any floor space formed by a bay window extension or any area at floor level occupied by fixed cupboards, unless otherwise excluded.
Exclude Area:
Exclude any floor space formed by a projecting chimney breast, unless otherwise excluded.
Unusable Space:
Consider the space immediately behind the door as unusable if it’s no wider than the door itself, excluding it from the floor area measurement. If this space is significantly wider than the door, allowing for items like a wardrobe without compromising circulation space, it can be included.

The following floor planLoft_conversion represents a typical Loft Conversion featuring sloping ceilings at the front of the property, leading down to the eaves void space. The portion highlighted in RED indicates the genuinely usable area, calculated in accordance with the Kun Arch guidelines outlined above. Originally, the client aimed to divide this Loft area into three rooms, envisioning bedrooms. However, upon careful assessment and hatching the permissible liveable space for each room, it became evident that the Loft Space is best suited for one large room. Consequently, the annotation was revised from “3 Bedrooms” to “2 STORE ROOMS” at the front of the Loft area, as illustrated.

The local council sets minimum room sizes, and the dimensions vary based on the type of room accommodation:

  • 7.5 sqm: Single Bedrooms
  • 10.5 sqm: Double Bedrooms
CONCLUDING REMARKS:

Within the Kun Arch guidelines, raised decking or patio areas below 300mm fall under Permitted Development, allowing for construction without planning permission. However, heights exceeding 300mm necessitate Planning Permission. Approval outcomes are contingent on the specific merits of each property, with the assigned case officer serving as the ultimate arbiter in the decision-making process.

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