Indy

Or the extremely persnickety who wants things to be just so and can't find pre-built houses (new or existing stock) that meet those requirements, leaving self build as the only option.

After a lot of research into UFH cooling with ASHP and Fan coils replacing radiators, this is the approach I'm going with. UFH with standard MVHR. Separate multi-split Aircon system to cool down the key rooms (bedrooms and living area). Heating things keep house nice, warm and relatively airtght. Cooling system blows nice cold air when I want it. Solar PV will mean you can run the air con on extremely hot days for very low costs.

This. Pretty much the only reason why I'm still sticking with the whole process. The market where I am has definitely softened in the last 12-18m, so it's now possible to buy something which offers us the same 'amount' of space as we're currently building and largely delivering the other criteria (area, garden, proximity to schools, transport etc). However, every single one of them will need to be reconfigured and need additional time and money spent to get us the house in the condition that we want, the configuration we want, with the specific finishes and all that jazz. At which point, its just easier to build your own and do it all properly anyway and then you know exactly what's gone into the whole process and what to expect.

Very interesting and quite a reasonable cost. I'm going for a traditional masonry build so makes even more sense to do it as the airtightness inherently will be worse than a SIPS product due to the nature of the build process.

Can I ask how much this cost?

Building a 285sq m house plus double garage will easily mean spending between £600k and £900k for a mid level/good quality finish without going over the top. Add in the professional fees/rental/SDLT and other related costs - you could be touching £1m on top of the £500k plot purchase price.

Agreed. The hard part is how do you find out before you engage which one is honest and decent against which one is an shyster. Unless you plan for worst case scenario and cover the eventuality that all of them are shysters - thus leading me back to his statement (and adding increased cost).

So mixed responses here. I agree (in my head at least) that it seems to be duplicating a bit of cost. However, I do also fully recognise my limitations - in a sense, even if I'm directly staring at some work that a builder/brickie/electrician/plumber would have done, I'd have no way to tell if it was good or not based on a visual inspection. I'd be relying solely on the word of the main contractor. I've done a lot of sifting through and found what I think are people that are trustworthy and people I can get on with - however, I'm not sure how much I can take anyone on their word. As my architect reminded me, everyone in this business is a shark and if they can find a way to charge you £500 for £50 worth of work, they will!

Been working with 2-3 builders to get prices for our build based off the Construction drawings/BR submissions. Did not go down the QS route and getting a BoQ (unpriced) for a formal tender process - as it's a one off new build and probably too small a job to be tendered like that. In discussion with all of them, they've hinted/implied that the price we're working to is based on not having a QS engaged as it means more effort for them / and more money for me - i.e. if they have to demonstrate and argue the toss at each stage payment so they would have to build in some fat into the contract if we choose to go down that route. We're engaging the builder/contractor for a full turnkey finish, so they will have their own site manager/project manager assigned to the project (which I'm already paying for). Do I need to also engage a separate PM that visits the site once every fortnight and work with the builder to manage the stage payments? Not sure how much this would be but it seems like an added cost and is that something I'd be able to take on myself? How have others managed it on their builds?

£2k sounds virtually impossible unless I source odds and sods off eBay myself - which implies I would know what's needed. Even the most basic unit from BPC without cooling was £4200 (Vent Axia) which then climbs up to £5800 for Zenhnder. That's the parts only without install.

Current plans are for a masonry build and SAP calcs include MVHR + cooling option. Not passive house but BR specs and airtightness target of 3 (I think). After speaking to a local builder, we’re leaning towards a timber frame build (MBC maybe) for speed mainly. Wanted to understand what the implications would be if I decided not to go for an MVHR system – mainly for cost. It seems to be adding about £10k+ to the build cost and to be fair – I’d rather use it for an air con system. Not seeing the payback apart from the comfort option and my personal feeling is that the comfort I get from having heating/cooling/dehumidification from an air con system is going to work better for me. What would it mean for the windows – do I have to add trickle vents or is there another way to overcome this requirement in a generally airtight build? I assume not going for MVHR would trigger a new as built SAP calc to be done at the end of the build, but as long as we achieve the same or higher in terms of overall efficiency – that should be ok?

From what I've been told - a freestanding appliance is not eligible for zero VAT. So an American style freestanding fridge/freezer would not qualify but integrated appliances would as they are 'built into the fabric' rather than just unplug and take it away types.

Yeah - nothing in materials and I don't have the exact breakdown, but adds about £500/slab in labour to achieve that finish. I wasn't aware that it existed until we saw it in a showroom in a very run down area.

Very much the way we went with it as well, including the mitred joint and also shark nosed edge for the worktops (which adds a fair bit of labour). We did have a tambour unit (I didn't know what it was called - I just used to call it the 'shutter/roller' cabinet) but it went away in the final design when we added the larder which will have a slide out shelf to be used for things like the coffee machine, kettle, toaster etc.

Yes, Self build so the VAT is claimable - apart from any freestanding appliances which seem to be excluded. So it looks like we'll have to pay it on the washing machine/dryer. Unless we go for integrated ones but then the cost of the surrounding cabinetry probably makes it about even anyway! Price wise - yeah, been to a few places and apart from a place that wanted to quote us £50-70k for a Hacker kitchen (same layout) - I haven't found anything cheaper. Not tried Howdens/Magnet etc as we like the German kitchen look. The reason I'm hesitating is that I think it's a little too much to pay for MDF cabinets - albeit very nice ones with top quality hinges and lights etc. We've also got a fair number of drawers, a double door larder and storage on both sides of the island, all of which didn't help the price.