Single Storey Rear Extension CASE STUDY

Islington
Ground floor single storey rear extension
Project duration - 14 weeks

Scope

Building a 3m permitted development single storey rear extension to old Victorian town house
Internal refurbishment maintaining original features of the property
Large bi fold doors to rear with addition of 2 no skylights
New kitchen located in extension

single storey rear extension

PREPARATION

Set up secure hoarding for site access and protection
Set up of plant and delivery of initial materials
Isolation of services on site for safety

single storey extension

GROUNDWORKS

Digging the foundations with depths dependent on-site conditions
Building Control to visit the site and approve the foundations
Pipework, drainage and services will then be laid within the foundations
Concrete footing will be poured in and levelled
Bricklayers to build up the damp-proofing course
Building Control will need to visit again to approve the damp proof course

rear extension

SUPERSTRUCTURE

Drains will be installed and trenches dug for the pipework
Concrete lintels will be inserted into the brickwork, if required
Steels will be put in place, along with pad stones that have been approved by Building Control
Sand will then be laid before damp-proofing membrane is put down
Insulation will be fitted
The concrete slab for flooring will be poured

extension

EXTERNAL WALLS

The external cavity walls will start to be built from blockwork and brickwork
Cavity wall insulation will be fitted
Wall ties will be inserted to fix the new walls to the existing ones
Lintels for windows and doors will be fitted
At this stage the external windows and doors will need to be templated

single extension

ROOF STRUCTURE

The roof structure will be created as per the design and structural engineers’ specification.
If you’re having rooflights, these openings will be created
Roofing membrane will be laid over the new rafters
Tiles/slates will be laid or fibre glass depending on flat or pitched roof construction
Fascias, soffits, verges and guttering will be fitted
The concrete slab for flooring will be poured

internal wall

INTERNAL WALLS

Internal walls will be built and plasterboard applied to the inside face of the new walls
First-fix carpentry, plumbing and electrics will be completed

Windows

WINDOWS AND DOORS

The bi fold/ sliding doors will be fitted along with any roof windows creating a water tight extension.

plastering

PLASTERING AND DECORATING

Plastering will take place and must then be left around a week before decorating can be carried out
Once the plaster is dry the first couple coats of paint can be applied

fix

SECOND-FIX

Second-fix electrics will be carried out, which means sockets will be made live, switches will be put in place and lights fitted
Flooring will be fitted along with skirting boards
Second-fix plumbing means taps will be installed and connections completed
Kitchen units will be installed

external work

EXTERNAL WORKS

Once the bulk of the building materials are cleared from site works such as fencing can take place
Gardens walls can be created for flower beds
Decking/ tiles can be laid to create an external patio area

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