Temporary propping, cranked steel beams and a new structural slab came first, because the back of the house was coming out. Then the walls went up in hempcrete blocks, cut to shape where they met the timber frame and the large rear opening.
The same blocks were used on the existing masonry as internal wall insulation, so the old wall and the new one perform alike. Underfloor heating runs through both the existing floor and the extension. Above, a flat roof with exposed oak joists, a frameless walk-on rooflight serving the terrace over it, and a circular window cut into the stud wall. New brickwork was matched and pointed to the original.
Temporary structural support being installed
Temporary structural support being installed
New floor slab for extension in Archway
Structural steel - cranked beams installed
Structural floor slab installed
Structural steel - cranked beams installed
Installing new roof structure
New extension wall being built with hempcrete blocks
New extension wall being built with hempcrete blocks
Insulating existing wall with hempcrete blocks
Extension wall is being built with hempcrete blocks
Extension wall is being built with hempcrete blocks
Extension wall is being built with hempcrete blocks
Hempcrete blocks internal wall insulation installed onto masonry wall
Hempcrete block used as internal wall insulation
New hempcrete wall with large opening and banister for roof terrace
Hempcrete block cut to shape to fit
Hempcrete blocks go on the wall
Hempcrete wall and large opening
Hempcrete wall goes up in and around timber frame for new extension in Archway
Hempcrete blocks built onto timber frame wall
New extension built with insulating hempcrete blocks
Underfloor heating for existing floor and extension floor
Extension roof and rear wall with large opening and hempcrete wall
Frameless walk-on roof light installed
New gate opening to rear garden
Steel elements inserted to hold banister on the top of extension
New brickwork going up to suit original brickwork
New brickwork pointing
Integrated roof light installed in new extension
New, decorative timber roof structure
Circular opening to stud
Circular window installed to studwall
Create circular opening to existing stud
Extension roof and circular window
New, decorative timber roof structure
New extension in Archway
Flat roof with exposed oak ceiling joists and frameless walk-on rooflight for terrace over extension in Archway
New extension rear wall in Archway
New extension wall with finished render
Extension opening completed
External light on rear elevation and terrace rainwater pipe
A rear extension is the moment to deal with the wall it joins, not just the wall it adds.
