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




Window challenges

On of the more significant challenges to building the extension is going to be the window. The reason for this is because the windows in the rest of the house consist of real lead light windows which are draft proofed with secondary glazing as shown below.

In April 2006,  new regulations superseded those laid out in 2006. The new and old regulation can be seen on the comprehensive Pilkington Glass web site. In brief, this stated that U values 2.0 for wooden windows were required in all new and replacement windows.  This meant that  low emissivity glass was necessary for compliance. Certainly, secondary glazing would not meet these new planning regulations!

Here is an example of an existing window. By the way, I have had to replace most of the window frames now made out of hardwood and most of the lead light windows themselves which I made my self. I will have to do the same for the extension. The question is - how can I build windows to match the existing house AND meet the new regulations. No, I will not consider a PVC unit!

One of the windows in the main house (yes, I need to do some painting!

The window as seen from the inside of the house

Showing how the existing windows fit into the frame and showing the
the secondary glazing

Clearly the new wooden windows will need to incorporate a double glazed unit of some sort. Would I be told by building control that I would have to go to 22mm air filled unit or could I go for a thinner - 14mm Argon filled unit from someone like Pilkington Glass? I need to find out!

An oak sill made to replace a window in the house

This is a sill I made last year to replace one of the windows in the main house. It was relatively easy to make with a router, circular saw and planer.

A leftover from one of the central uprights

The uprights were made from 69 x 94mm planed softwood. The extension window will have a plane chamfers on the inside rather than an ogle.

A leftover from one of the outside uprights

Some plans were now needed!

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