We are in the process of getting the building regulation drawings done for our detached new build house & are not sure whether to go for water under floor heating or go for extra insulation with solar panels, oil Aga with back boiler & multi fuel burner also with a back boiler?

Any advice would be greatly appreciated.

Thank you
Joanne James

  • Paul Hoyle

    You should go for the extra insulation and solar panles regardless imho. Our houe which is being roofed at present has been calculated as requiring about 6kW hating at -3C outside but it is a renovation not new build. With a new build you should easily achieve much better than that. An oil fired Aga is likely to use a lot of oil compared with what you require just for heating, A multi fuel burner with boiler in addition to the aga appears overkill to me. Have you got any calculations for heat requirement and looked at how much actual heating you then require? Also have a look at how much the Aga will use just to keep it ticking over.


  • Paul Hoyle

    Forgot to mention, our house will be 232m2 so very similar area.


  • Tony Taylor


    It is very difficult to make a decision on which is the best form of heating, a lot of variables at play and as many different systems as you could desire. Rest assured you are not alone, I have spent almost a year building a website to answer your questions with lots of free information and guidance to enable you to ask the right questions and narrow your selection to the most viable option.

    The primary thing you should do is reduce the need for energy in the first place. For decades, houses have been built with the nominal 50mm cavity insulation layer, where in reality we should be using 200mm and above, in order to get the energy demand for the building as low as possible.

    This approach also serves to insulate (no pun intended) you from the volatile energy market.

    Have a look at the Passivhaus way of building, which may not be suitable for your property, however a good deal of the principles of insulation and air tightness are relevant.

    As Paul rightly mentions above, getting an idea of the heat required for the building will inform any decision you need to make about forms of heating.

    Hope this helps.


  • Andrew Patrick

    Hello Joanne

    You are going to need a Design Stage SAP Calculation done to check and demonstrate that your design meets the requirements of Part L1A of the Building Regulations and the Building Services Compliance Guide. The data from the SAP Calculation can then used to carry out a Renewable Technologies Suitability Review.

    This exercise is the best and most accurate way to determine your Renewables strategy before you start your build.

    You have to have a SAP Assessment at Design stage so that is the time to accurately and objectively determine what you do with Renewables.

    I am a qualified SAP Assessor and can produce all the reports you need and quantify the benefits of different Renewable Technologies.

    If you haven’t progresses to that stage yet please get in touch for a quote.


    Kind regards


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