GS Renovation converts lofts across Finchley, in the 1930s semi-detached and interwar family houses that fill N3 between Hendon and the North Circular. These roofs are hipped, which wastes the width, so hip to gable with a rear dormer is the scheme that pays here. We coordinate the engineer and take it through Barnet Council building control.
Getting a floor into a Finchley interwar roof
The part of a loft conversion that surprises people is the floor. The ceiling joists already in your N3 roof hold up the plaster below and nothing more, so a new floor is formed on joists sized by your structural engineer and carried on steel beams that span between the party wall and the new gable or flank. Those steels bear on padstones bedded into solid brickwork, and the new joists are deliberately kept clear of the old ceiling below.
Once the floor is designed, the shape follows. Squaring the hipped side up to a full gable recovers the width that the slope was stealing, and a rear dormer gives standing height across the back of the house. Finchley's interwar semis usually have the 2.2m to 2.4m of ridge height needed for this to work without lowering ceilings, though the purlins and any chimney stack running through the space will shape where the stair and the en suite can sit.
Barnet planning, party wall and Article 4
A semi-detached or detached house gets a 50 cubic metre permitted development allowance against the 40 given to a terrace, with the same conditions: materials to match, nothing forward of the existing roof plane, no verandas or balconies, and side windows obscure glazed. Barnet has conservation areas and Article 4 directions, and the Hampstead Garden Suburb area nearby is very tightly controlled, so permitted development should never be assumed. We confirm with Barnet Council before design work begins.
A hip to gable on a semi builds new masonry right up against the wall you share, and the steels for the new floor usually bear into it, which makes the work notifiable under the Party Wall etc. Act 1996. The duty to serve notice on your neighbour is yours as building owner, not ours as contractor. What we do is prepare the structural information your party wall surveyor needs and sequence our work to the agreed method so the programme does not stall.
- Structural steel sized by the engineer and set on padstones
- Rooflight conversions where the roof line must not change
- Trussed roofs redesigned before any web is cut
- New floor joists independent of the existing ceiling
- Head height and ridge survey before design
Why Finchley Homeowners Choose GS Renovation
Finchley owners choose GS Renovation because forming a gable and a new floor in an interwar roof is proper structural work, and that is the firm's background. We coordinate the engineer, install steels and padstones to specification, prepare your party wall detail and manage Barnet building control to certificate. Led by a founder with 30+ years of hands-on experience, fully insured, with a dedicated project manager.
- Free, no-obligation quotations
- A dedicated project manager from first survey to handover
- Honest answer at survey if your roof will not take a conversion
- Site left safe and secure at the end of every day
- Party Wall notices prepared for steels bearing into a shared wall
- Ridge height measured before any design work is commissioned