My extension progress thread

Soldato
Joined
7 Feb 2004
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I got some plans drawn up last year for an extension and got some quotes from builders to do the entire build, this was coming in at 30 -35k. I chose my builders and they were due to start in April this year, however they kept putting it back and when I rang them they were slack at returning my calls. I was half way through July and still nothing so I sacked them off and decided to do it myself.
I'd do the foundations, hire a couple of brickies to do the build, get my brother in laws father to do the joinery and my work mate who used to be a roofer to do the roof, at long last I could get started, so I've been at it 3 weeks but I've also been away on holiday for a week so all worked stopped.

This is how it looked, house was built in the late 20's, the conservatory is absolutely boiling in summer and so cold it's unusable in winter.

original.jpg


The plans, the build will be 6.2m wide by 4.5m deep with a 3m bifold door in one side, 3 windows in the side facing the garden, 2 velux, this is the maximum amount of glazing we were allowed due to building regs.

plan1.jpg


This new summer room will be open plan to the existing dining room with an approx 280mm drop down (one step between levels so roughly 140mm), the extension floor will be 35mm above the outside patio level, the idea so that when the doors are open it will flow into the garden.

plan2.jpg


Time to crack on then, quick phone call to my mate woody to come round with a sledgey and the demolition begins, all the conservatory screws had rusted and seized so it had to be ripped apart.

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Conservatory down, now to attack the bay window, which shouldn't take long...

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Arranaged for the joiner to come down at dinnertime to board up so 3 or 4 hours to remove the bay. They glass had been painted in over the last 80 years so with beading removed still wouldn't shift so the glass had to be smashed out which was a right mess. The amount and size of wood and nalis holding the bay up was unbelievable it wasn't going to be pretty to remove and the joiner was due soon, in the end we sawed through all the uprights but it still didn't shift then just started pulling it down so it came down in one huge lump and ran when it fell, it was then made secure.

bay.jpg


Next we marked out the footings and hired a mini digger, about half way through the day we hit the conservatory footings, the digger wouldn't touch them so we quickly got hold of a hilti gun to break up the concrete, this wasn't at all upto the job but it was all we could get hold of.
I arranged for the building inspector to come aswell as we'd done the footings 600mm deep, he needed to check this was deep enough for the soil type, if he'd have said he wanted them deeper at least we'd have had the digger still there.
Here I am on the digger and my old man breaking up the concrete.

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Footings nearly dug, just a bit to dig away by hand as the sides were crumbling in.

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We needed 250mm concrete so hammered metal bars in so we knew were to fill the concrete to, I then got half a dozen mates with wheel barrows and 3 ton of concrete delivered, that was a mad 20 minutes as the wagon drivers don't hang about for long.

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Two brickies and one laborer turned up at 9am, spent an hour measuring, marking and getting ready and were upto damp proof course by just after dinner.

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That's were I'm upto now, I'm just waiting for skip number 6 to be dropped off and then I need to remove the soil and rubble upto a depth of 330mm below dpc level ready for the flooring layers which consist of stone, concrete, insulation etc and the underfloor heating pipes in a screed.

My estimate for the build is now coming in at 17k so with a few unseen costs should come in under 20k.
 
You’re going to have a lovely summer room when it’s finished. I presume that it will have a tiled roof?
 
Well done, but £20,000 still seems very expensive, considering how little you actually gain.

About a years wages after tax for the average person!

If you don't mind, what are the main expenses?
 
Well done, but £20,000 still seems very expensive, considering how little you actually gain.

About a years wages after tax for the average person!

If you don't mind, what are the main expenses?

We should gain more than a little, it's going to be 20' x 15' which is a good size.
As for expenses, so far:

£1000 for plans, planning and building regs
£690 for 6 x 8m skips
£270 concrete footings
£105 digger and hilti gun hire

To pay:

£2100 for brickies to brick upto roof level, to do the floor and to resize the window in the bedroom above the extension as it will need altering. Also to render and pebble dash the outside.
£4200 for the joiner to secure by board, make window templates, supply and erect roof, supply and fit 2 velux windows, supply and fit 4 windows, make arch former, supply and fit fire door for the garage, supply and fit skirting and architrave. Make a step.
£1000 for the roof, fitted foc by mate
£5000 for building materials
£800 underfloor heating
£200 electrics? (not sure yet)
£2000 alu bifold door
£500 plastering? (not sure yet)
£200 drainage (not sure yet)
 
depending on what leccy your having in there(im guessing your not having the house rewired) you might want to add another 300-400 to that est.

Could well be, it's a friend who's doing it for cash and I'll be running all the wiring, he'll just be connecting up so I was hoping to do it for less but I still may have under estimated.
The consumer unit is the old type with fuse wire so I'm not sure what will be needed. I haven't even thought about electrics yet, I'll have to speak to him soon about when he will need to get involved.
 
if u have an old re-wireable board BS 3036, i would suggest atleast upgrading to a 16th ed compliant one if your on the cheap. Or go the full whack on a legal 17th ed board. I take it he will be signing the work off?
 
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if u have an old re-wireable board, i would suggest atleast upgrading to a 16th ed compliant one if your on the cheap. Or go the full whack on a legal 17th ed board. I take it he will be signing the work off?

It will have to be signed off for building regs, so whatever is needed will have to be done. My £200 estimate for electrics sounds a bit iffy now:D
 
My mums thinking of doing an extenstion. Over the garage and turn it and the garage into a bedsit for me 8D I would get my own front door.

And this is looking good so far I admire your bravery at doing it yourself! Looks a bit like our concervatory when it was being built at the moment x3
 
Have you double counted the roof or have I misunderstood?

The chippy will have to build the roof structure. Then the roofer will skin and slate it.

If its mates rates id say 400 signed of is good. But your doing the channling and running tho, so maybe less? You do know the 17th ed regs that apply to a new build/past build? If not its guna be best to leave it to your buddy.
 
The chippy will have to build the roof structure. Then the roofer will skin and slate it.

If its mates rates id say 400 signed of is good. But your doing the channling and running tho, so maybe less? You do know the 17th ed regs that apply to a new build/past build? If not its guna be best to leave it to your buddy.

Know em? I've never even heard of them!
I was hoping he'd come down give me an idea of what needs to go were and I'd run the wiring out for him.
You've convinced me to ring him sooner rather than later.
 
Know em? I've never even heard of them!
I was hoping he'd come down give me an idea of what needs to go were and I'd run the wiring out for him.
You've convinced me to ring him sooner rather than later.

:) sorry m8. Im not trying to wee on your bbq or anythink. Its just that the electrics are often over looked in these types of builds. Just ask him to pop round and have a gander?
 
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