I've posted a link to this blog on a forum
www.ebuild.co.uk/forums/messages/774/12685.html?1222424910 . a few people interested in the costing so:
Fairly accurate costing for DIY 16m2 loft conversion room with 4m2 landing area
Not counting the complete new roof in slate with breathable membrane done by a contractor, cost including supply and fitting of steels and installation of velux £6000 plus vat. I’ve included the material cost of steels and velux.
4 velux, 3 off 1140 x 1180, 1 being escape spec, 1 off 780 x 980 - £1188
Rockwool Flexi to bring fire resistance of lathe and plaster ceilings up to spec - £322
Chicken wire to support above - £80
Celcon blocks, sand cement for fire wall to neighbours -£191
Steels UB’s 230x90x32kg/m PFC 1off 4900mm 1 off 4000mm - £150 est.
Joist hangers - £47
Timber for structural and stud walls - £265
Radiator and various hardware - £298
Chipboard flooring P5 grade plus some PSE - £157
Kingspan for roof and ashlar - £348
Kingspan drylining K17 for brick walls - £305
More assorted hardware - £162
Electric, cable and high spec fittings - £180 est
Timber for stairs - £450 est
Plaster board - £129
Skirting and architrave - £99
Skim Plaster, bead and plasterer for 2 days - £165
Assorted other bits and bobs - £120 est
1/2hr fire door and frame - £122
Flooring Oak veneered laminate, underlay, edging -£332
Estimate of others, eg. smoke alarms, paint, lost receipts - £300
Structural engineers calcs - £264
Building control submission - £130
Building control inspection - £283
Electric certification - £80
(all work under supervision of electrician (father in-law)
If I’ve missed anything obvious let me know.
Total cost - £6167