Estimating renovation Cost

[SteamyTea]

What I hear and read from others us that everything is a surprise to a builder, and as soon as they open the door to start work 'they have never seen anything like it before'.

By the time you are showing them the third thing that needs doing, they are thinking about ways to cut corners on the first two items.

Tell them you have no contingency.

Edited May 9, 2021 by SteamyTea

[severnside]

Thanks all for useful feedback. After more research it seems our budget of 120k is unrealistic, we would be happy if it can all be done under 200k. 

Our estimation so far

- Approx 16 sqm fist floor extention (above existing GF Dining Room) for a bedroom with ensuite [£1500 per sqm, this is standard bedroom with ensuite on first floor]

- Approx 45 sqm of single brick, no insulation outbuilding to be improved (insulation, damp proof) and integrated in main house [£700 per sqm, this good condition building need damp proof and insulation]

- Approx 47 sqm of new glazing [£350 per sqm, minimum spec double glazing with different thickness of panes for acoustic performance]

- New Kitchen/Diner with removal of internal load bearing wall [25k]

- Update 2 Toilets [10k]

- Approx 72 sqm of ground floor to change to underfloor heating and tiling [13k]

- Heating system update, currently warm air system with oil boiler (3 year old) to underfloor heating downstairs and radiators upstairs [10k]

- Whole house Rewire [10k]

- MVHR, primarily for fresh air, house might not be very airtight to get energy efficiency benefit [3k DIY, if complicated to do downstairs, we will only do first floor]

- Changing stairs position with  new stairs [5k, nothing bespoke but something slightly better looking]

[PeterW]

13 minutes ago, severnside said:

Approx 47 sqm of new glazing [£350 per sqm, minimum spec double glazing with different thickness of panes for acoustic performance]

Not sure where you are getting your numbers from on this ..?? Good acoustic UPVC should be around the £250 mark. 

[severnside]

8 minutes ago, PeterW said:

Not sure where you are getting your numbers from on this ..?? Good acoustic UPVC should be around the £250 mark. 

Thanks for the input, this is sort of feedback I am looking for here. We are early in estimation,  so far it's from internet searches

[Buzz]

25 minutes ago, severnside said:

Good acoustic UPVC should be around the £250 mark. 

Have 3 quotes for upvc in and they range from £220 - £260 m2 with the £260 being 3G in cream. all include fitting .