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


Final assembly of the window

Wednesday, 14th March: Task one is to add the hinges to the outside pair of casement windows that will open.


The frame and the casement were marked up at the same time to ensure the solid brass hinges are aligned.

The hinges were screwed on with only one screw initially.

The windows now open and close!

The casement needed to be planed to stop the outside edge catching the frame when the casement window is closed, but otherwise they seemed to fit OK
This picture shows the two windows temporarily attached.

Here are all the pieces needed for final assembly - the only things missing are the double glazing units which have yet to be ordered.

The completed window frame

The three casement windows

The three leaded lights

Saturday, 17th March: Now is the time to putty the leaded lights into the frame.

A good trick is place the linseed putty into a microwave for 30 seconds to warm it up and soften it.
Use a knife to create a thin layer of putty onto which the leaded light panel can be bedded.
The leaded lights are fixed in place by using short gimp pins the fix the panel in place at the corners.

This has to be done otherwise the corner of the panels will pop up making it impossible to putty the panel.

Make sure the leaded light is the right way round i.e. the outside uppermost.
Use a knife push the putty into place around the edge of the leaded light.

In this picture you can see how the putty pushes up against lead came that was bent down on the outside of the leaded light panel.

To do the final smoothing of the putty, place the tip of your knife in boiling water on a regular basis.

A completed casement window

A casement window shown in place

The assembled window - outside view

The assembled window - inside view

The pigs-tail casement stay to match the rest of the house

The pig-tail casement catch

The completed window with the stays and catches fitted

Saturday, 24th March: The last job is to order and fix the 22mm double glazing panels behind the leaded light. The window is very heavy now and it'll be even heavier when the double glazing has been added!

To see how the windows look in the completed extension go to here.

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