Distance between fixtures? Maximum window size?

[Weaf]

Good evening all.

 

New here and looking for some advice on a porch I’m planning to build.

 

The porch will be block built with a 100mm cavity. I have already bought a composite door at 900mm wide and planning on purchasing uPVC double glazed window next. What I would like some advice on is what would the size of largest window would be that would realistically fit on the same aspect. I have attached a rough scaled drawing of the front face of the porch where the door and window will both be.

 

I also wanted to ask:

 

Is there a minimum distance advised between window and door frames as to not interfere with the integrity of the wall? ( A)

 

and secondly, is there a standard distance from the top of a door frame to the level of the soffit? (B). (The roof will be 30 degree pitched with tiles.)

 

My dad is a retired bricky who has kindly offered to do the block work. At nearly 80 he is very vague when it comes to rules and probably hasn’t refreshed his knowledge of building regs since the mid 60’s! Any advice is really appreciated to keep my dad in check once he starts wielding his trowel around!

 

(the external porch dimensions are W 3700 x 1300 front to back)

 

Many thanks in advance,

 

Paul. W 

[DevilDamo]

Assume you have Planning?

 

Will you also be removing or replacing the original front door… if so, you will also require Building Regulations and the following should be used.

[Hannah77]

If you don't want to comply with the spacing between the window and doors as posted by @DevilDamo above you would need to introduce a wind post. You would need to get your structural engineer to spec that and include it as part of your building warrant application. Porches are typically classed as permitted developments so long as they don't exceed any of the required criteria. If you do have planning and want to change the window or door size then you (or your architect) may be able to submit that as a non-material variation assuming the changes aren't critical.

 

Also need to consider lintel type and minimum bearing required. If you are going for separate lintels for the door and window minimim bearing of a robelsee type precast lintel is usually 150mm. So you would need 300mm between the window and door. You could get a larger capacity lintel and span the full distance between the window and door. Assuming you are rendering. Pretty sure Catnic style lintels for ifyou are using facing brick have a similar bearing requirement.

Edited July 30 by Hannah77

[Dave Jones]

if its a porch, just make the sizes look equal. same space either side of the door and window etc.

 

Have the window attached to the door frame, be cheaper.