extension

  1. E

    Drain question and Build Over Agreement?

    Hi all - appreciate any thoughts on this please: Attached is the current layout of my property. The Orange line is where the back of my house was originally built to. The previous owner added the conservatory, utility and bathroom to the back (over 15 years ago). The blue square is where...
  2. J

    Steel beam and welded plate detail

    Hi All, I have a first floor extension similar to the one in the photo below, but about half the span (~3.3m span with two columns). The photo shows that they used a steel beam with a plate welded to the underside, but installed the beam to carry the outer leaf rather than the inner one...
  3. lworbey

    How to heat a house without gas suggestions

    I am intending to move house later this year and was intending to buy a house that needs renovating and has space to extend. I intend to remove any gas supply for various reasons including the gradual move away from gas and the fact that although I cannot generate my own gas, I can generate...
  4. M

    Extension next to TPO tree - is it possible?

    Hello, Grateful for any advice as I cannot find a post which exactly matches my enquiry. Part 1. I Have a large weeping Silver Birch which is located approx 3.5 m from property, the large canopy takes up a vast chunk of the garden, is there any realistic possibility that a council will permit...
  5. J

    Extension width/length not divisible by exact brick size

    Hi, Our extension width and length is not divisible by an exact number of bricks (taking into account a standard mortar width of 10mm). This is for an extension with planning permission - not permitted development. What might be the best approach? - create the walls slightly under the planned...
  6. A

    Leaking extension roof (Ed.)

    Single story extension is leaking in heavy rain - we have a flat ceiling inside and in heavy rain both spotlights are dripping heavily with water. One towards the back of the extension wall and one towards the front. We’ve also got 2 other wet patches. We’ve been on the roof and inspected the...
  7. R

    How to support Rafter on RSJ

    We are planning an extension that will abut to our pitched roof. This will involve cutting back rafters and replacing the roof plate with an I-Beam. I would like to understand how this should be installed to continue to support existing rafters please. The below shows 2 options of how I envisage...
  8. J

    Crown roof height transition

    Hello, I’m trying to design a crown roof for our rear extension with two of the sides at 270cm (to reduce light impact for the neighbour) and 300cm at the other two side (to allow us to have higher kitchen units). This creates the problem of what to do at the transition between the heights. I’m...
  9. J

    Boiler upgrade requirements for extension

    Hello, we are planning a rear extension which will add an new UFH system, one extra radiator, and an extra towel rail. Currently we have a 10 year old Worcester Bosch 25si combi boiler which is doing alright. It has recently been serviced and the gas engineer said it is looking good...
  10. R

    Damp around rear uPVC garden door

    I noticed a couple of small patches of damp around the rear uPVC door in the extension leading to the garden. Additionally the extension is very cold with the floor in particular being cold. The step outside the door is built on a foundation of bricks that are exposed and the gutter above the...
  11. M

    Combining two roofs - best option?

    Hello Previous owners had an extension built that basically acts as an independent structure with it's own boiler, consumer unit etc... and it's own roof. Didn't think anything of it when we moved in 2 years back but the valley where the two roofs meet has been a source of leaks, partly due to...
  12. J

    Second floor extension

    I am looking at getting a second floor on extension which will be open on first floor for just path, so first floor would be a room, would planning permission be need to do this? The attached image shows how I would want it to look like, however my house is a semi and will need a bit of...
  13. M

    Flat Roof Extension-Parapet Height

    Hi all, I'm planning on having a flat roof extension (5x3m) with a parapet style walls but stuck on height requirements for the parapet wall. I'd like to have the parapet style walls with either stone or metal coping to avoid having plastic trims/ visible gutter pipes/etc. but I'm having...
  14. J

    Width of external wall with 2023 building regulations

    With the 2023 building regulations changes it looks like the external wall width (from exterior brick to finished plastered internal wall) for a new extension would be: 102.5mm - exterior bricks 150mm - cavity for standard insulation (unless using some higher performance / more expensive...
  15. J

    Underground drainage layout for extension

    Hello, hoping I can get some feedback on a drainage layout I'm trying to do for our extension. This is an update on an earlier design I posted - I've now removed the internal manhole and it is located outside instead :) We have a private combined drainage system that heads over to our...
  16. T

    Breathable roofing membane

    Hi, I have recently put proctor roofshield breathable roofing membrane on my 15 degree pitched roof extension. Over the last week with the heavy rain I have noticed water coming through the membrane on to the roof rafters as if where I have nailed the battens to them. The inside of the...
  17. J

    Single storey extension deviation

    Hello I’m new to this site and am looking for some help please. Currently going through a small extension and remodel of a semi-detached house. The rear elevation of the extension has half with a recessed bifold doors and the other half with a small bay with a projecting glazed bay window...
  18. P

    Possible extensions

    Hi, Im looking at house extensions on the property (images and current floorplan below) and what ideas people can come up with. The ideal would be to: Retain the garage Making the kitchen/diner more spacious (potentially one space and/or extending it) Create at least one study (2 people work...
  19. J

    Warm vs cold roof extension depth

    Hi, I’m having difficulty finding an answer to what seems a simple question. What is a typical depth for a warm vs cold roof in a rear extension? i.e the measurement from the underside of the ceiling to the top of the roof. Thank you!
  20. J

    Drainage plan for extension

    Hi, I'm trying to self plan a rear extension to our semi-detached house, and hoping someone could give some feedback on my drainage plan. Currently the rain water pipe (RWP), and soil vent pipe (SVP) connect to a manhole at the rear of the property. This is a private drain, that then runs into...
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