Easy way of calculating house extension costs?

donmaico

Heck there is so much to think about.I just read that kitchen conservatories are no longer classified as such by local councils so building regs have to be adhered to which could mean a lot more expense and hassle .Also being opem thge house would use a lot more gas to heat it,i am now thinking in terms of either a small extension to increas the size of the kitchen with an adjacent conventional conservatory with doors leading from both the new kitchen and existing lounge.The other alternative would be a sun lounge with a solid pitched roof which would , as before include a kitchen

marcg

Conservatories have lower heat retention building regs requirements than straight extensions. You can also get cheap upvc ones added a lot more easily than knocking down walls and sorting out flooring joins and other making good.

Don't get me wrong, you can add a fully glazed extension, but it will need careful design - this is why I point out the boiler replacement as being key. A typical 15+ year old boiler will have 75% efficiency. New ones have 97% and this makes a massive difference to the before and after energy calculations. Often enough to offset the overglazing.

The kitchen extension + cons is definitely the easier way to go from my architect's point of view but not necessarily the best solution for the house. The other thing to consider is the loss of light to the lounge. Even with a conservatory through the old window opening there will be much less light in the lounge. I recently completed a kitchen extension on a small terraced house that left the kitchen and lounge windows facing a small courtyard instead of infilling it. The existing house had the kitchen (and bedroom 3 above) projecting into the garden (think typical Victorian terrace) and the new extension was full width on the end of the kitchen. In this way there was no loss of light to the original house.

donmaico

marcg wrote: »

Conservatories have lower heat retention building regs requirements than straight extensions. You can also get cheap upvc ones added a lot more easily than knocking down walls and sorting out flooring joins and other making good.

Don't get me wrong, you can add a fully glazed extension, but it will need careful design - this is why I point out the boiler replacement as being key. A typical 15+ year old boiler will have 75% efficiency. New ones have 97% and this makes a massive difference to the before and after energy calculations. Often enough to offset the overglazing.

The kitchen extension + cons is definitely the easier way to go from my architect's point of view but not necessarily the best solution for the house. The other thing to consider is the loss of light to the lounge. Even with a conservatory through the old window opening there will be much less light in the lounge. I recently completed a kitchen extension on a small terraced house that left the kitchen and lounge windows facing a small courtyard instead of infilling it. The existing house had the kitchen (and bedroom 3 above) projecting into the garden (think typical Victorian terrace) and the new extension was full width on the end of the kitchen. In this way there was no loss of light to the original house.

we shall be replacing the boiler for a combi as this would remove the tank up in the converted loft space

slssup

I am buying a small victorian terraced house and need a new kitchen extension 3m * 3m my boyfriend plans to dig the footings and do the main work such as lay the concrete flooring etc. We really just need a builder to build the walls and put a roof on the extension as we have people to do the plumbing and electrics. We are hoping to do this for £5k do you think this will be possible?
thanks

lincroft1710

Is the builder going to provide all materials and plaster walls/ceiling, install rainwater goods? What sort of roof will it be a flat felt covered boarded roof or pitched tiled roof? The type of door(s) and window(s) will greatly influence costs.

slssup

We will provide the material for digging foundations and laying the flooring because my boyfriend is going to do that. We would need someone to do the rest. Flat roof on the top of it. We think it will be 3m * 3m any idea of the cost?
thanks

lincroft1710

I just checked to see what I paid 2 yrs ago for my extn, but it's impossible to compare with what you propose. As your boyfriend is doing the foundations, I would suggest you approach 3 builders and ask if they could give you a quote for the work. You will have to be very specific what you want doing and what materials you specify, i.e. bricks, doors, windows. If you haven't already applied for building regulations you will need these, you may also need planning permission and if you happen to be in a conservation area, this will cause further problems, a flat roof extn may be a no no.

Also remember that not all builders will want to "finish off" what someone else has started.

pingu2209

I was told for the South East an all in price to include the windows, pitched roof, architrave and skirting etc. it is £1500/sq m for the downstairs and then £1200/sq m for the upstairs. This may also include a 'standard' ensuite too.

duffypeter

High Im planing to have an extention built soon in south west scotland.
Down stairs is 6m wide by 6m depth up stairs 6m wide by 3m depth glass sliding doors pitched roof with 6m wide and 3m depth patio area on top of lower extention with balustrade system in glass

Can some good person please give me a price they belive it might cost

Thank you peter

paul5046

Any updates on this thread, and has anyone had the extension done. I would guess a kitchen extension must be more expensive than say a living room. Kitchen includes more plumbing and fittings.