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Planning Permission for Roof Lantern
Anonymous user 9 March 2024 - 2.52 PM
On our house we have an extension that was built 15+ years ago before we moved in, it has a flat roof, we wish to add a roof lantern and re-do the flat roof. With the roof being so old, and not meeting current building regs, the new flat roof will be 'taller' and with the height of the roof lantern will take it over the 150mm height allowance for permitted development. So because of all this planning is required, along with building regs. So... What do I need to do? Do I need someone to draw up plans for this to be submitted? Seems like a lot of hassle and cost for just getting approval to a new flat roof and lantern.
Are you a tradesperson and able to answer this question?
2 Answers
Anonymous user
Hi,
There are two things to look for:
1. Planning requirements 2. Building Control Requirement
1. Planning Requirement -
For Permitted Dev Maximum height of 3m for flat roof extension. This is the height between natural ground level to the eaves ( where flat roof meets external wall) of the flat roof.
The lantern does not fall under the 150mm rule. The maximum height of the lantern should not be more than 4 metres from ground level as this is the maximum height for pitched roofs. By the way, 150mm rule applies to skylights / Velux which are fixed to Pitched Roofs.
Summary: No need to worry about planning.
You can still confirm this by getting your plans prepared by a designer and then apply for a certificate of lawfulness.
2. Building Control Requirement
To put a sky lantern, you will need to consult a structural engineer to find out the appropriate sizes of structural members to support the roof and sky lantern. Usually, a report will be prepared by the engineer. This report will be required by the Building Control.
So checklist for you:
1. Consult a structural engineer
2. Get the structural engineers report
3. Appoint a builder and fix a date
4. Send building notice to Building control (private / council does not matter) and pay fees.
5. Wait for Building control departments approval on structural calculations.
6. Start the work by liaising with the building control officer.
Hope this helps.
Answered27 September 2017
7
Anonymous user
Mike. As long as u use building regs, your job will not require any permisions as such!
If the joist sizes are 25mm more than existing, thats fine! Even if u do a cold roof, and install say 50mm insulation board, then WPB good quality external ply, thats fine too!
The only problems i can see from existing is..
1. Upgrade ALL insulation. 50mm is good.
2. Maybe install a Continious 25mm Airflow to Soffit, if u form a Soffit.
3. If the rooflight was overlooking a neighbour, that cud be a problem, unless u installed Obscure glass, that wud be ok then.
Apart from that Mike, the jobs a good un.
Steve Hale
Answered27 September 2017
4