Planning the build
Why build an extension?
Initial design sketches
On-line Building Regs
Meeting planners
 Meeting building control
 Planning the foundations
 Planning the floor slab
 Marking out the footings
 Damp proof course issues
 Possible drainage problems?

 Construction of the walls
 Proposed roof structure
Windows diary
 Window challenges
 Initial window plans
 Making the casements
 Making the frame
 Designing leaded lights
 Making leaded lights
 Assembling the window
 The little window

 The door frame
Demolition diary
 The demolition starts!
 The demolition continues
 Still more demolition

Foundations diary
 Foundation issues
 Drain issues
 Digging the foundations
 Rethinking foundations!
 Pouring the foundations

Floor slab diary
 Rethinking the slab!
 Floor vent extensions
 Preparing the slab #1
 Preparing the slab #2
 Pouring the slab

Walls diary
 Preparing to build walls
 Build up to the DPC
 Build the walls #1
 Build the walls #2
 The gas men cometh
 Build the walls #3
 Finishing the walls
Roof diary
 Roof structure build
 Tiling the roof
 Finishing the roof
 Finishing the gables
 Roof insulation

 Floor screed
 Shower room
 Shower room floors
 Shower room walls
 Utility room
 Utility room walls
 Utility room floor
 Finishing the windows

Project finished!
 Final inspection
 The certificate
 Final thoughts

 Twelve months on!
 Material costs
Sister sites
 House re-roof project
 Home gas usage data

 Stop paint flaking
 DIY secondary glazing


Marking out the footings

I wanted to make sure I had an outline of the extension in my head to see its exact layout and size and to check it was how I had been imaging it to be! I also wanted to start checking how many of the slabs I would need to take up to dig the footings.

The marked up walls assume a thickness of two 100mm thick blocks plus 90mm of insulation material making a total wall thick ness of 30cms (12"). The red chalk shows the position of the wall and the yellow the edge of the footings trench.

The left-hand side of the extension

The existing toilet will need to be taken down. I will be keeping the old bricks as they are as rare as hen's teeth. I will probably use them on the outside wall below the DPC level which will not be covered by render.

The right-hand side of the extension

The two steps shown will be removed. The ground level of the internal floor being level as the chalk marks OR with the DPC, which can be seen just to the right of the upper step. (The existing step covers the DPC which is not really a good idea!

The brick part of the building shown above was built in the 1930s while the rendered part of the building in the top photo was build in the early 19th century and it looks like the DPC layers are at a different level. Looks like that' s the next issue to look at.

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