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It is unusual for a builder to send their you cost breakdown like that, but mine accidently sent me their internal spreadsheet for our loft conversion. From memory it had about 10% overheads (project management, QS, skip hire etc) and a 15% profit margin.

No, you are mixing up kW and kWh (a kW per hour doesn't make sense). Your boiler will, presumably, modulate somewhat too. What are you hoping to achieve with these calculations?

It's normal and nothing to worry about

Multitool with oscillating blade?

What is the purpose of a krone strip? The ethernet cables can just be plugged directly into the switch and run to wall sockets?

The homehub (router) needs to be between the ONT and other devices, so option 2 doesn't work, unless I misunderstand what you are talking about.

You're going wrong by assuming the boiler is outputting 24kWs. To produce the same amount of heat (assuming 90% efficiency) it would be using 5kW/0.9 * 10p = 55.5p/hr

I can 100% guarantee it will not be cheaper for the tenant... And if you are changing rads every 5 years there are some other problems!

11kW would be 3-phase, almost all car's on board chargers are limited to ~3.6kW per phase (7kW single phase EVSE will make use of two of the charger phases). If the car was truly capable of 22kW charging (very few are), one phase going down would have dropped the charge rate to 14.4kW, not 11kW.

Cutting with an angle grinder as described above would be the way to reduce the height, but this will be very dusty. I would whack them with a bolster to loosen then and then fill with screed or something.

Your bending in the long direction will be entirely dependent on the long beam cross section. If you're determined to keep the design you need to stiffen those members. Could you replace the long edges of the frame with a box section of thicker aluminium or even steel?

Small gaps shouldn't really matter much if they are sealed against drafts. Insulation works based on square meters

Lock

Is it newly laid? If you're just refreshing it normally you would just sweep kiln dried sand in with a broom.

You ripped down your ceilings because of some hairline cracks???

If you think it's possible that is leaking and you intend to use the fire you need to get it professionally checked, and possibly have a liner fitted

Easifill. Apply it with a spatula and squish it into the hole.

Tile first

Yes, sockets can be in the cupboard under the sink

The headset contains lenses.