In reply to gingerkate: People have already given you loads of ideas about the typical cost. I'm not from a building background but am an engineer by profession... I recently bought a plot of land and built a 5 bed house and here's how i saved a LOAD of cash. Some of these ideas may work for you depending on your skills etc.
1) I employed a builder (just him and a lad) to do the brick/blockwork, the tiling, the plastering. Basicly all the main labour intensive jobs that would have taken me YEARS to complete if i attempted to do it myself.
2) I draw up all my own plans - Autocads not that hard to learn!
3) I paid a structural engineer to re-check all my engineering calculations and put there name to it - keeps council and NHBC happy.
4) I did all the tree felling and land clearing myself - i even managed to get a local plant hire company based just up the road to give me a 16 ton digger (thats a big 'un) and a Dumper at a discounted rate for weekend use and on a drive yourself basis - which they don't often do for individuals on the big plant gear.
5) I did all the ground works myself, including all the drains and other supplys - its a one man job really. Mine was a big reinforced slab with loads of steel reinforcing which i ordered and assembled myself. The large sheets of mesh i craned into position using the digger - so really was a one man job! Did the shuttering etc and then hired in a concrete pump and did the pour myself (although next door neighbour came and offered to follow me around with the big vibrator jobbie to get all the air out, and also the guy who drove the pump was a big help)! Was shitting bricks the night before the concreate arrived - wondering if my shuttering etc etc was up to it, hoping my quantity calculations were right - it all turned out spot on).
6) As mentioned I got a bricky/'builder' after the slab was down. However I did all the buying so could chase around for best prices.
7) The design of my house included quite a bit of steel work. I did all this myself - just got a mate to help me lift up etc. Saved a fortune by doing it myself - did all the cutting, welding and bolting together. All as per calculatons made above.
8) I did all the plumbing and wiring myself, including all underfloor heating, mains pressure hot water system (Decent pressure showers!). With the wiring i was able to go the extra mile by intergrating fancy lighting controllers, Home Cinema kit, various home automation and security systems. I can turn my heating on and off, set thermostat temperatures in each room all from the internet/mobile phone if need be - dead handy for when you're coming home late, coming back from holiday etc - in fact all the lights can be controlled like this too. The cost of this type of kit - if you do it all yourself is not really that much! an X10 Dimmer module for example is only about the same cost as a standard wall dimmer. I recon that by doing it all myself I put the system in for less than i would have paid an elec. to do a standard re-wire. That said you have sign off issues under part-p. Luckly I am Chartered with the IET (As was the IEE) and managed to get it all signed off no problem.
7) all the associtaed clearning, ground works, gardens, drives, etc i did myself - again keeps the cost down
8) Windows and doors - i got supply only from a 'trade' type supplier and fitted them all myself.
9) Internal joinery etc. Had an oak staircase manufactured and fitted it myself with help from my dad. - Thats not a one man job! All other wood work, door casings, skirting, door hanging etc i did myself. Nothing difficult if you take your time and get it right.
10) Bathrooms - ended up with three of them upstairs which seemed like a great idea at the time but turns into a load of work when you come to do it. Shop around for tiles and make sure you get a trade card where possible. By this stage you'll probably already have trade cards at builder mechants - chase prices at the likes of Plumb centre for bathroom suites.
11) Kitchens - Howdens - cabinets come pre assembled - there really isn't that much work to do installing it all. I bought a Jog for doing my worktops but ended up going for granite in the end - which i got an outfit in to do.
12) Screeded floors - did it myself but have since come across a couple of lads who will do it for next to nothing if u supply all the gear.
13) joists - my mate gave me a lift up with them
14) Roof trusses - not as heavy as they look - me and a mate got them up. Mine was a fairly complex roof but the supplier should come out and pre measure for exact sizes so most of it goes straight up, then the compex bits aren't really rocket science to cut and fit. Breathable felt on and then put the tiles on with the help of my brickie and his lad.
15) decorating - a complete ball ache and something i hate doing because i end up being a perfectionist about it - cutting in i left to my (now) wife who has the care to make it right - i rushed and ended up getting frustrated at the results! I had plenty of tiling and other stuff to get on with so left it to her. I like rollering walls though
16) I tiled almost all of the ground floor but put carpets upstairs and in one room downstairs. - paid supplier to fit them - but bought my own underlay from a trade supplier at a MUCH cheaper rate - good tip this for anyone!
All in all you can save A LOT of money! Many of the skills you will pick up on the way. I would imagine that doing an extension rather that doing a whole house would be a much better scale of project for a first timer to have a go at a lot of these things. And if you use the building and NHBC inspectors to your advantage you can butter him up to support and advise you rather than just put obsticles in the way!
Right enough waffle - i write loads when i've had a few beers!
6) Then with regards to