Home 
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
 Guttering

Internals
 Floor screed
 Plumbing
 Electrics
 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!
Out-takes!
 Mistakes
Costs
 Material costs
Links
 Links
Sister sites
 House re-roof project
 Home gas usage data

 Stop paint flaking
 DIY secondary glazing
 gare.co.uk

 


Material costs of building the extension
 
 
  Size Number Cost VAT Total
Building notice         310.00
Moving the gas pipe         455.90
Skip hire 6 Metre       155.10
Floor grinder         55.81
Electrician sign off & connection         130.00
Tool hire          
Kango masonary saw day       47.00
Electric bolster hammer weekend       28.50
Window          
Window casements 50 x 75 par x 2.4m 6 28.40 4.97 33.37
Wood filler         4.98
Wood glue         6.40
Spacer 44mm x 12mm x 2.4m par 2 1.29   2.58
Window frame 69 x 94 mm x 2.4m par 5     62.60
 Lead came 16mm x 5mm 2 5.28 0.92 6.20
Lead came 10mm x 5mm  10 16.60 2.91 19.51
Roundals   3 9.57 1.67 11.24
Whiting   1 0.85 0.15 1.00
Cement  5kg tin 1 5.95 1.04 6.99
Shipping cost     6.99 1.22 8.21
3mm glass panes 118mm x 148mm 3mm 54     27.00
Brass butt hinges         13.96
Gimp pins to fix lead lights         1.30
Putty   2     3.96
Primer paint         11.40
screws 80mm x5mm       1.30
Door Frame          
69 x 94 mm x 2.4m par 3 37.56 6.57 44.13
Drains & water          
Water pipe 3/4" Primo coupling 1 10.87 1.90 12.77
22mm adapter   1.68 0.29 1.97
Clay pipe coupling       10.98
Foundations          
Sand 1 tonne bags 3 117.16 20.50 137.66
Cement Bags 24 76.08 13.31 89.39
Aerated Blocks 20 1     16.80
Steel reinforcing rods   3 20.52 3.59 24.11
Floor slab          
Timloc telescopic vents   4 31.32 5.48 36.80
Timloc extensions   4 31.32 5.48 36.80
Timloc drain pipe adaptors   4 19.20 3.36 22.56
Timloc airbrick   2 5.48 0.96 6.44
Drain pipe 4 metre 1     20.98
Sealing tape (to seal vents)         7.38
Black DPM 25m x 4m 1     32.84
Inspection chamber cover   1     101.05
Steel reinforcement mesh 3.6m x 2.0m (+delivery) 2     148.00
RC30 ready mix concrete 2 cubic metres       258.50
Walls          
Aerated Blocks 1 pallet @ 100 1     79.80
Aerated Blocks   35     29.40
More aerated blocks   30     24.00
Rudgewick Red Multi 3 Pallets @ 390 bricks pp 3     671.46
Rudgewick Red Multi   50     28.20
Wall ties   125     14.25
Insulation retaining clips   125     10.10
DPC 30M 1     5.99
85mm Dritherm insulation 1200x455mm  (14 per pack) 3     123.37
Tiles to insert   40     14.78
Lintel 1.2mm       24.68
Lintel 2100mm 1     47.29
Roof          
Roof joists 3m - 150 x 47mm 12 (Total price) 168.28
Wall plates 5.4 - - 150 x 47mm 2      
Rafters 2.4 - 150 x 47mm 11      
Additional joists 3.6m - 150 x 47mm 3     40.75
Rawlbolts   6     26.88
Expandite wall tie-bars 2.3 metre 3     60.00
Various bolts, screws and plates         60.00
Right angle brackets   26     30.42
Wall plate straps 1 metre 4     8.72
Tile battons 200metre       76.70
Extra tile battons         12.94
Barge and soffit boards 150 by 20mm PAR       73.85
Breathable membrane 30 metre       39.98
Clout nails for tiles 1.5"       7.48
Nails for battons 2"       6.21
Roof felt 5 metre       5.38
Reclaimed clay tiles 900       581.63
Reclaimed clay tiles 400 extra tiles       258.50
Waney wood for gables 5 off 3.6 metres       83.86
Lead flashing, 3m x 240mm 3       113.97
2.4 x 1.2m  by 50mm insulation 1       25.98
2.4 x 1.2m  by 90mm insulation 4       162.15
Floor slab          
Bitumen masic         7.99
2.4 x 1.2m  by 90mm insulation 4       103.92
Floor screed sand and cement         89.62
Internal walls          
40mmx25x2.4m wood 24       47.52
70mmx38x2.4m wood 10       26.80
Miscellaneous timber         90.82
Frame fixing screws (packs of 16) 7       59.36
12.5mm moistureproof plasterboard 6       50.88
12.5mm palsterboard 5       22.96
2" nails         2.98
Yale night latch for rear door         39.98
MDF sheet         8.68
Skirting & architrave@2.4m 13       68.25
Cladding @1.8m 8       42.00
38mm x 19mm sawn timber 2       8.42
Floor tiles 3       44.94
Tile spacers 2       5.96
Tile cutter         29.98
Floor tile adhesive 3       77.94
Paint         39.84
White wall tiles 10       69.80
White tile edging 2       6.96
Skirting board         44.72
Double glazing         168.74
Glass bead & screws         32.07
Paint and stuff         69.36
Step quarry tiles         35.43
Paint brushs         12.94
Electricals          
5-way Consumer unit 1       58.98
2-way Consumer unit 1       11.98
MCBs 6       50.88
45 Amp pull cord switch         11.98
ceiling pull cord switches 2       5.58
10m 10mm cable 10 mtres       32.98
5-way Consumer unit 1       58.98
Cables, sockets, sleeving etc         113.26
2w consumer unit for house end         13.24
16 amp breaker         8.48
2-way light switch for kitchen         5.88
Shaver socket         12.75
Extractor fan for shower room (delay)         37.98
Extractor fan for utility room         32.98
Metal cable cover @ 2.4m 3       4.15
Black Cable ties         3.40
Earth clamps 3       4.44
5m 100mm cable for shower         15.48
Plumbing          
Single radiator, 1000x50mm 1       32.40
15mm copper pipe 3       15.78
Towele3 radiator 1       99.00
Shower trap 1       8.48
Shower tray, 900x900mm 1       79.98
Waste stuff         10.26
copper piping, connectors, valves etc         208.99
Mira shower         164.98
Bolts to mount basin         0.60
various 15mm bits         11.25
Toilet connector         8.98
offset bends 2       6.36
various seals and bits         41.80
Toilet pipe extension         8.85
Shower enclosure         349.00
Miscellaneous plumbing         74.52
Guttering         58.40
Floor          
Floor self levelling compound         7.28
ready mixed cement         6.35
Tile spacers         2.48
Diamond electric tile cutter         29.98
Floor tile adesive         43.96
PVC sealer         9.98
3 tile packs for shower room         44.94
7 tile packs for utility room         90.86
sheet steel to cover channels         12.94
Fittings          
Cupboard         105.88
Door furniture         22.29
Miscellaneous         48.98
Total to date         8,551.16

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