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
 Hipped roof build
 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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