Sloping ground-Rear extension

[ea2020]

See image attached.

The house in question is painted white with the brown door.

Basically we are proposing to demolish the existing temporary extension and replace it with a 6m extension.

As you can see there are concrete steps leading down onto the lawn.

The proposed 6m will finish where the lawn is.

From the rear wall of the existing house to the lawn there is a 900mm level change.

At the front of the house i.e. on the main road side the ffl is approx. 150mm.

Now if i start to measure my eaves height from the lawn which is where the rear wall of the new extension will be and measure 3m up my internal ceiling height will be tight.

Can you please clarify as to what to do in terms of maximizing height and where i should measure from?

Many thanks to all that have replied.

 

[ea2020]

More pictures below

 

[ea2020]

I would be grateful if someone can take a look at pictures and advise accordingly.

Many thanks

 

[tony1851]

It's hard to say without being on site.
'Natural ground level' may lie somewhere between the ground level at the front of the house, and the lawn at the back.
This would be the case if the original builders built up the area at the back to avoid a 900 drop.
I suspect your natural ground level would be at the position of the red arrow on the attached sketch, and that is where the 3m eaves

height would be measured from.

 

[^woody^]

If a 6m extension would not be approved if applied for, and if a 6m extension with a lower floor is more beneficial than a 3m extension with a level floor, then have a 6m extension carefully designed around the PD constraints. This could include a part vaulted or mansard style roof with no ceiling to deal with some of the height restrictions.

 

[unclebob1]

tony, that is exactly what i needed to do to allow my pd extension, but rather then have steps at the point where new met old, i took the floor down in the back room so the connected rooms were all same floor level.

 

[Huavito]

Hi there,

I am going through a similar predicament, and I wanted t check what the outcome was at the end. I have a drop of 700mm and the extension will have an annoying entrance as the roof will be very low.

It would be great to know how you overcame this (if it was possible!).

Thanks!

 

[unclebob1]

Hi there,

I am going through a similar predicament, and I wanted t check what the outcome was at the end. I have a drop of 700mm and the extension will have an annoying entrance as the roof will be very low.

It would be great to know how you overcame this (if it was possible!).

Thanks!

In my case, i had approx 500mm underfloor space in the existing part of the house, so dropped the entire floor level down for the connecting room. This gives impression of a high ceiling, but nothing majorly out of place.