DevilDamo

I assume you’ll be redesigning the internal layout as the removal of that side wall appeared to be quite crucial and retaining it would impact quite a few rooms?

Internal alterations do not require Planning. You wouldn’t really need to inform Building Control either, unless there’s now an impact on the means of escape.

Providing you have PD rights, you can erect something up to 1m high. The additional caveat to that is if you’re replacing something that already exceed 1m. So if there already was a 2m high fence then technically, you can erect a 2m high gate in its place… https://www.planningportal.co.uk/permission/common-projects/fences-gates-and-garden-walls/planning-permission

No. Neighbours and other consultees are consulted on Householder applications. A Householder application can take up to 8 weeks to be determined. Consultees are usually given 21 days to comment but this can be more and even up to the date of the formal determination.

What type… casement, sash? If the latter, this is a product I have specified in the past… https://www.roseview.co.uk/products/ultimate-rose/

Unless I am missing something, but what’s stopping you from erecting a 1m high gate? Are your PD rights still intact? Edit: I’m also confused as to what you secured approval for as your post appeared to mention a garage conversion but your drawing just shows a garage… or is it a driveway with a fence around it?

Get George Clarke or Kevin McCloud on side and you’re laughing 😉 www.thesun.co.uk/fabulous/4775498/couple-transform-embarrassing-flat-into-spacious-two-storey-house-viewers-not-impressed-how-it-looks/amp/

The Prior Approval wouldn’t work for you as your proposals would not constitute PD.

You wouldn’t be in their best books whichever way you decide. But by applying before you start is better than during or after. They cannot tell you to stop works if there’s a live and pending application. They could potentially tell you to stop should you not submit an application and are reported for potentially unauthorised works. But the first thing the LPA would or should do is invite you to submit an application.

That is what the SAP calculation will prove… even though the extension in isolation fails the glazing threshold, the whole house does not. They’re not expensive to have done.

@Newbie To Extensions What’s the point in applying retrospectively? Why not just submit a Planning application, submit a Building Regulation application and start building? Although it isn’t advised to start works before or without receiving Planning approval, it’s better to apply before than doing it after. @ProDave Although the OP was wanting to avoid the “lengthy” Planning process but have what they need (which requires Planning).

That’s right. Your proposed extension along with the existing extension would be 100% of the overall width of the original dwelling, hence why it would not constitute PD. The majority of single storey extensions go through Planning with no issues. There shouldn’t be any major reason as to why yours wouldn’t go through too. If they were to be difficult, you could argue that you have a potential PD fallback position. But as mentioned above, that fallback position would be a slight reduction in the depth (so the extensions do not connect).

https://assets.publishing.service.gov.uk/media/5d77afc8e5274a27cdb2c9e9/190910_Tech_Guide_for_publishing.pdf (Page 26) In your situation, the resulting extensions would not meet PD as they would fail to meet the PD rules for a side extension, as elements would come off a side wall. PD doesn’t just focus on extensions in isolation but the “resulting” extensions which do not form part of the original house.

Ok, now I’ve seen that… my opinion changes. If the yellow part connects to the green part, it isn’t PD. If the above layout is what you want, you will require Planning. Otherwise, reduce the depth of the yellow line part so there is no physical connection to the green part.

This design would appear to meet the PD rules.

LDC applications are optional. If you’re confident the proposals are PD, there’s nothing stopping you in submitting a LDC application, then a BR application and then starting works. Wrap arounds are not normally PD. But primarily because they fail the “no more than half the width” rule. This one would appear to meet that, especially if the garage is original.

Normally, you’d require 150mm on top.

It would appear to comply with the PD requirements. If you want that formally confirmed, you would need to submit a Lawful Development Certificate application. Btw, assume this is not a bungalow? You will require Building Regulations. A BN application is fine providing you’re not excavating over or within 3m of a public sewer. Otherwise, you would need to submit a FP application. Or if you get the Build Over Agreement sorted before you submit a Building Regulation application, then a BN application would be ok. Will your excavations be within 3m of a neighbours’ building?

If the depth does not exceed 4m and the overall width does not exceed more than half the width of the original house, then it may well be considered PD. Any reason why you’re trying to avoid Planning? Are you within the Green Belt?

There is a “possibility” that upon grant of Planning, the LPA may remove your PD rights. So the outbuilding would then require Planning and may well be refused due to its impact within the openness of the Green Belt. It’s always advisable to get any PD works done first.

So why did you speak to Building Control? 🤔

That would come under Planning’s remit, not Building Regulations.

Even though the OP’s LPA has not introduced a CIL charging scheme, where does their post mention works have commenced?

No harm in going in for Pre-application advice. Just remember each formal application is determined on its own merits.

What are the chances the LPA would have refused a 3m high outbuilding? Would it have had any impact on neighbouring properties? Are you within the Green Belt?