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Thanks for the thanks guys! OP - 8 weeks is the guide by which LA's try to abide, more of an aspiration really. As part of the 8 weeks they have to consult with neighbours etc which takes 3 of those 8 anyway so at the speed the LA works you can see where the 8 weeks goes. Dependent on what...

Hi Ive just done a double extension, mainly myself, but had a few trades in I did my own pp drawings and submitted these - these were passed about 3 days shy of the 8 week limit. Then I got a friend of a friend (architectual technician) to do building regs drawings for me and also got a...

You could try soundblock plasterboard - Its denser than normal pb (and twice the weight). Ive used it on the underside of a flat roof on my extension as it was a bit noisy when it rained. Can still hear the rain but it has improved things. Also you can use rigid board insultaion in a stud...

Hi there I had a similar situation with my build. Ive done a double storey rear ext, partial side loft conversion (dormer bungalow turning a pitched roof into a gable) and new front dormer. I worked out that everything but the front dormer was PD. When I approached LA re what to do, they said...

With regards national grid and doing some of the donkey work yourself I.e digging etc I found That they will charge the standard fee whether you dig out or not, there was no money to be saved there. Basically they will charge about £1500 to move meter 0-2 metres and will charge about another...

I have just had my gas meter moved re an extension and it cost a fortune. I would suggest you contact National Grid about your questions. They would probably have to survey the site so as to give an idea of the order things need to be done in. Also I wouldnt pay anyone else to expose pipes...

Try this as well...

Yes those are the documents I was looking at and worked to so I think they are up to date. To get a definitive answer which is bang up to date, us the calculator on Celotex's website. The supplier I suggested is the cheapest I could find. They advertise on Ebay as well, but you can do it...

Ive just seen your comment about BC checking u values. I dont know how they would actually measure it, but mine didnt. The BC officer came into the extension and said 'Theres Celotex everywhere!' in a tongue in cheek fashion and that was it. Ive learnt that, well I suppose like everything...

Hi there I am not a builder, just a keen amateur doing a self build. Ive done a lot of working with the u value figures on the web and Celotex's website. Those figures quoted by your architect appear to me to exceed what you require - You dont need figures that low to pass building regs I...

Hi there Im doing a double storey ext at the mo, similar dimensions overall to yours and I put 120mm Celotex in between rafters and 30mm under for roof. 80mm in walls including internal and ground floor ceiling and 80mm in the floor - cost about £2000. That was about 16 sheets of 120mm, 16...

Hi It will cost you more money for a start as you will have to get the SE to re calc for timber beams. If your SE has spec'd steel beams then you would probably have to have flitch beams which are wood with steel in between all bolted together. We have just had 2 flitch beams...

Hi Similar issue with the flat part of my new extension roof. Rain very noisy. Ive got an EPDM roof, 18mm ply then joists. In between the joists is 120mm Celotex and across the bottom of the joists another 30mm of Celotex. This has dampened the sound, but it is still there. I am now awaiting...

Hi there Ive just done a flat (crown) roof like this: 1 EPDM roof 2. 18mm ply 3. Firrings 4. Roof joists with 120mm Celotex in between and 50mm min airgap between top of insulation and bottom of ply deck 5. 30mm Celotex under joists sealed with foil tape and acting as VCL. I was...

Yes, its vented (cold roof) with 50mm air gap minimum above the insulation between the joists. I think my point is Celotex either recommend a warm roof i.e. insulation all above, or a cold roof, insulation all below the deck with ventilation. I dont think they support a hybrid warm and cold...

On Celotex's website they state they do not support having insulation above and then between joists, only all above or between joists and below. I have just fallen a bit foul of this because I misread my plans. My architect spec'd for 120mm Celotex warm roof i.e. all above, but I put the...

Two storey rear extension to a timber framed house, conversion of exisiting garage roof to utilise space therein as part of the build (sort of loft conversion - house is a dormer bungalow) - £840+VAT This included speccing the foundations, superstructure including flitch beams. Also had to...

Hi there Ive just fitted a firestone rubber roof to the new crown roof on my extension, approx 45 m2. I went for the commercial grade product - 1.52mm thick instead of the domestic stuff 1.14mm? I think - Was slightly more expensive but I thought thicker should be better. Overall I am...

It has been suggested at £1k per sqm for the extra floorspace for a basic extension going up to perhaps £1.5k to £1750 per sqm for a higher end finish.

I dont know if you were asking above where I am re the £2000 drawings quote. That quote was provided by an architects firm in Billericay, Essex. The quote I went with of £475 was a friend of a friend who is an architectual techinician, but does it privately in his spare time.