Plan & Budget
Prior to commencement of the build we had finalised our plan and budget for the project. The build time is a total of 4 months (or 17 weeks).
As we progress I will be closely tracking to this plan and our budget as with such a small build and small budget any cost overrun could add quite a large amount to the budget in percentage terms.
A couple of points to note from this:
SIPS: The major cost for the build are the SIPS panels at around 20% of the total cost. This will mean that our timber frame will arrive on site as panels, already insulated to the exact size of our house as per our plans, after being manufactured off site. This decision was based on a combination of cost, speed (should take around 2 weeks for the whole thing to be erected on site), minimal (or no) wastage and its airtightness benefits. 70% of this cost must be paid up front, prior to delivery.
We have been able to get the building society to agree to front loading the money we require (ie. Giving us more upfront) to cover this large upfront cost.
Other significant costs include:
Pv Panels: We are quite happy with the price of our 1.5KW system, coming in less than we expected. I think the cost of Pv Panels has really fallen in previous years. The price covers full installation and from a company local to us too.
Green Roof: We have had 3 quotes in from external companies to come and install our entire green roof for us and they have ranged in price from £10-16,000 which would be a hugely disproportionate cost for our build. So we are sending our builder on a green roof training day and are going to install it ourselves. The individual components that make up the green roof are not overly expensive and it also means that we will have the knowledge then on how it is done. The cost is then a lot friendlier on the purse strings!
Passive ventilation system: Due to the airtightness levels of the SIPS panels we need to have a way to ventilate the house – something we would have wanted to do anyway. We do not have the space for a MVHR system nor were we keen to use one so the option we are going for is a passive system called Ventive, which we have written about previously here. This is probably one of the components going into the house that we are most excited about.
The overall spec of the property will be relatively simple and modest. This being the kitchen and bathroom. They will not be budget fixtures and fittings but perhaps the next level up which will give us some quality of product that will have longevity. We do not feel that spending excessively in these areas is necessarily sustainable.
These will be purchased new only if we are unable to source suitable second hand products which will be our first and most preferred means of fitting the house out.
Do let us know if you have any queries or comments about any of us. Also, we would be keen to hear from you if you have had any experience of or know where to source suitable second hand/pre-loved kitchens and bathrooms.