Best APEX roof option on an extension?

livEwirE

My OH and I are getting a 25mtr sq extension built at the back of our house to be used as a dining room. We have a south facing garden.

We are looking at either using an Apex roof with Velux roof lights or an Apex roof with a hip and Velux roof lights.

We would ike to maximise light coming in and would probably put another velux on the hip if we went with that option.

What would people recommend based on past experiences? What are the pros/cons of each?

Does anyone have any photos/images of these two different types of roofing, it would be very useful to compare them?

All feedback is GREATLY appreciated

sydthebeat

what is the current roof type on the existing dwelling?? hip or gable?

a hip roof on an extension has 3 roof plans, a gable has two


if you are going up into the attic space with the ceiling id advise you to go with a gable roof with a high feature glazed element to the south elevation.

gable are cheaper to build than hips.

this is a hip


this is a gable

livEwirE

The extension is being built is a single storey room to the rear of a typical 3 bed semi detatched house in a housing estate.

We are not going up into the attic space.

Thanks for the advice, the pics are useful to see.

martinn123

Here's a Gable, and A Hip, hope this helps.

martinn123

livEwirE wrote: »

The extension is being built is a single storey room to the rear of a typical 3 bed semi detatched house in a housing estate.

We are not going up into the attic space.

Thanks for the advice, the pics are useful to see.

You need to consider the possible loss of light to the existing house, as its a semi, you may have a window on the gable end, shining light were you are coming off the house, patio doors. If not you will loose a lot of light which currently enters the house.
velux will allow light into the extention but not back into the house.
A glazed front on a gable roof will allow more light, in, so I suggest a glazed gable, velux both sides, best of luck.

sydthebeat wrote:

gable are cheaper to build than hips.

That depends, on the pitch and how the roof is supported.
Also a glazed window, in the gable, will be a custom make, and can be expensive. With horizonal tie bars you won't get a triangular window as the top won't come to a point, so that window will be a special, so template for frame, glass, etc, costs a lot more.
A hip roof is a simpler construct, and no special glazing.

sydthebeat

martinn123 wrote: »

That depends, on the pitch and how the roof is supported.
Also a glazed window, in the gable, will be a custom make, and can be expensive. With horizonal tie bars you won't get a triangular window as the top won't come to a point, so that window will be a special, so template for frame, glass, etc, costs a lot more.
A hip roof is a simpler construct, and no special glazing.

:rolleyes:

euro for euro a gable roof is cheaper to build than a hipped roof.

a gable roof is simpler to build than a hipped roof.

a hipped roof doesnt allow for triangular glazed so the argument comparing both, but with additional cost to the gable, is mute.

martinn123

sydthebeat wrote: »

:rolleyes:

euro for euro a gable roof is cheaper to build than a hipped roof.

a gable roof is simpler to build than a hipped roof.

a hipped roof doesnt allow for triangular glazed so the argument comparing both, but with additional cost to the gable, is mute.

All true, but perhaps the OP and others are interested in the cost of the Extention, not just your musings on the cost of the roof only.

However if its just a roof you want,:eek: I can't argue with the above.

sydthebeat

martinn123 wrote: »

All true....

i know.....

martinn123

sydthebeat wrote: »

i know.....

Your reply, I find, offensive.
To dilute my post to 2 words, and quote in support of your posts, is typical of the way some posters with a different view are treated.

To put this in context, you advised the OP who has a reasonable question regarding an Extention, as to the roofing options, as follows

sydthebeat wrote:

id advise you to go with a gable roof with a high feature glazed element to the south elevation.

gable are cheaper to build than hips.

I then posted a pic, of such a gable, with a Sunburst glazed feature, and disagreed with your statment that gables are cheaper, because of the Glazed element.

You dismissed my conmments with

sydthebeat wrote:

euro for euro a gable roof is cheaper to build than a hipped roof.

a gable roof is simpler to build than a hipped roof.

a hipped roof doesnt allow for triangular glazed so the argument comparing both, but with additional cost to the gable, is mute.

In terms of the accurate use of the English language, in your post, you are correct, but we were discussing an extention not just a Roof.

so in my view dismissing comments which are aimed at helping a Poster, by MisQuoting or selective quotations, is arrogant, where a view is in opposition to your own
Finally have another look at the Pic I posted of a Gable Sunroom, with a
'' high feature Glazed element'' If you are of the opinion that the same extention with a Hipped Roof is more expensive, You are Wrong, as my suppliers quotes will show.

Poor Uncle Tom

livEwirE wrote: »

My OH and I are getting a 25mtr sq extension built at the back of our house to be used as a dining room. We have a south facing garden.

Planning Permission.

If you are getting planning permission either option can be used. If you are carrying out the work as part of a development, exempted from the provisions of the Planning and Development Act 2000, you may only construct the hipped roof of the two options you have given, unless you already have a gable facing the rear.

martinn123

Poor Uncle Tom wrote: »

Planning Permission.

If you are getting planning permission either option can be used. If you are carrying out the work as part of a development, exempted from the provisions of the Planning and Development Act 2000, you may only construct the hipped roof of the two options you have given, unless you already have a gable facing the rear.

Any possibility you could post a link to this provision, I personally have done a few Gable Extentions, in the situation, similar to what you have described, and in each case have obtained a Cert of Compliance/Exemption



. I am aware of many other similar extentions, where I did not get the Gig.

Thanks

Poor Uncle Tom

martinn123 wrote: »

Any possibility you could post a link to this provision,

I hope you don't mind me diluting your post for emphasis..

CLASS 1

The extension of a house, by the construction or erection of an extension (including a conservatory) to the rear of the house or by the conversion for use as part of the house of any garage, store, shed or other similar structure attached to the rear or to the side of the house.

Provided That:

1. (a) Where the house has not been extended previously, the floor area of any such extension shall not exceed 40 square metres.

(b) Subject to paragraph (a), where the house is terraced or semi-detached, the floor area of any extension above ground level shall not exceed 12 square metres.

(c) Subject to paragraph (a), where the house is detached, the floor area of any extension above ground level shall not exceed 20 square metres.

2. (a) Where the house has been extended previously, the floor area of any such extension, taken together with the floor area of any previous extension or extensions constructed or erected after 1 October 1964, including those for which planning permission has been obtained, shall not exceed 40 square metres.

(b) Subject to paragraph (a), where the house is terraced or semi-detached and has been extended previously, the floor area of any extension above ground level taken together with the floor area of any previous extension or extensions above ground level constructed or erected after 1 October 1964, including those for which planning permission has been obtained, shall not exceed 12 square metres.

(c) Subject to paragraph (a), where the house is detached and has been extended previously, the floor area of any extension above ground level, taken together with the floor area of any previous extension or extensions above ground level constructed or erected after 1 October 1964, including those for which planning permission has been obtained, shall not exceed 20 square metres.

3. Any above ground floor extension shall be a distance of not less than 2 metres from any party boundary.

4. (a) Where the rear wall of the house does not include a gable, the height of the walls of any such extension shall not exceed the height of the rear wall of the house.

(b) Where the rear wall of the house includes a gable, the height of the walls of any such extension shall not exceed the height of the side walls of the house.

(c) The height of the highest part of the roof of any such extension shall not exceed, in the case of a flat roofed extension, the height of the eaves or parapet, as may be appropriate, or, in any other case, shall not exceed the height of the highest part of the roof of the dwelling.

5. The construction or erection of any such extension to the rear of the house shall not reduce the area of private open space, reserved exclusively for the use of the occupants of the house, to the rear of the house to less than 25 square metres.

6. (a) Any window proposed at ground level in any such extension shall not be less than 1 metre from the boundary it faces.

(b) Any window proposed above ground level in any such extension shall not be less than 11 metres from the boundary it faces.

(c) Where the house is detached and the floor area of the extension above ground level exceeds 12 square metres, any window proposed at above ground level shall not be less than 11 metres from the boundary it faces.

7. The roof of any extension shall not be used as a balcony or roof garden.

From...

http://www.irishstatutebook.ie/2001/en/si/0600.html#sched2

Corkblowin

Poor Uncle Tom wrote: »

I hope you don't mind me diluting your post for emphasis..



From...

http://www.irishstatutebook.ie/2001/en/si/0600.html#sched2

The op says they have a standard 3 bed semi - which I would take to be a 2 storey dwelling.

Assuming that, my reading of 4(a) is that he can build a gabled extension providing the apex of the gable is lower than the rear wall of the house - ie the ridge is below the soffit/eaves.

martinn123

Poor Uncle Tom wrote: »

I hope you don't mind me diluting your post for emphasis..



From...

http://www.irishstatutebook.ie/2001/en/si/0600.html#sched2

No problem, with the dilution....

maybe its me and my emphasis on the English language, but to quote

4. (a) Where the rear wall of the house does not include a gable, the height of the walls of any such extension shall not exceed the height of the rear wall of the house.

(b) Where the rear wall of the house includes a gable, the height of the walls of any such extension shall not exceed the height of the side walls of the house.

These refer to the height of the walls, not the shape of the roof.
If I am mis-interpriting, please enlighten me with your thoughts

again thanks

Poor Uncle Tom

Corkblowin wrote: »

The op says they have a standard 3 bed semi - which I would take to be a 2 storey dwelling.

Assuming that, my reading of 4(a) is that he can build a gabled extension providing the apex of the gable is lower than the rear wall of the house - ie the ridge is below the soffit/eaves.

Just putting the information out there so an informed decision can be made.

martinn123 wrote: »

These refer to the height of the walls, not the shape of the roof.
If I am mis-interpriting, please enlighten me with your thoughts

Yeah, that's as I see it too. The gable is considered a wall whether it's block or glass. As Corkblowin has indicated, if the wall is two storey there shouldn't be a problem with a gable, if it's a single storey a gable may be out.

sydthebeat

martin, no need to get in a huff at all.

i responded to the OPs post.. specifically

We are looking at either using an Apex roof with Velux roof lights or an Apex roof with a hip and Velux roof lights.
We would ike to maximise light coming in and would probably put another velux on the hip if we went with that option.
What would people recommend based on past experiences? What are the pros/cons of each?

the OP also went on to state

We are not going up into the attic space.

so if you want to suggest to the OP that in these conditions a hipped roof is more expensive than a gable then go ahead, but you'll find thats not the majority held view.

I was the one who actually suggested going into the attic and using a gable feature window. But the OP dismissed that with the last quotation.

so what are you getting upset about...

i posted

i know

because, after quoting me and implicitly suggesting i was incorrect, you go and actually agree with what i said.

take offence all you want, water off a ducks back to me :rolleyes:

martinn123

Poor Uncle Tom wrote: »

Just putting the information out there so an informed decision can be made.

Yeah, that's as I see it too. The gable is considered a wall whether it's block or glass. As Corkblowin has indicated, if the wall is two storey there shouldn't be a problem with a gable, if it's a single storey a gable may be out.

You will have to do better than that, if its single storey, a gable front, because of the height, would need a double hip roof attaching to the house, so a box gutter, or a lead valley, and I know you don't like them.

Poor Uncle Tom

martinn123 wrote: »

You will have to do better than that, if its single storey, a gable front, because of the height, would need a double hip roof attaching to the house, so a box gutter, or a lead valley, and I know you don't like them.

I'm afraid you've lost me here martinn123,

martinn123

sydthebeat wrote: »

martin, no need to get in a huff at all.

i responded to the OPs post.. specifically


the OP also went on to state


so if you want to suggest to the OP that in these conditions a hipped roof is more expensive than a gable then go ahead, but you'll find thats not the majority held view.


so what are you getting upset about...


take offence all you want, water off a ducks back to me :rolleyes:

Suppose it depends on what the OP took as ''Going into the attic'' my attic is above the first floor.
Again, to refer to my pic as posted it shows a gable fronted sunroom, with a vaulted ceiling, ''into the attic'' with a Sunburst Glazed front, with vertical structural support, not just a big triangular window, and in addition, a half moon section with Sunburst Effect.
Try buying that for the price of the Hip.

that's why I said

That depends, on the pitch and how the roof is supported.
Also a glazed window, in the gable, will be a custom make, and can be expensive. With horizonal tie bars you won't get a triangular window as the top won't come to a point, so that window will be a special, so template for frame, glass, etc, costs a lot more.

As to

take offence all you want, water off a ducks back to me

me too

martinn123

Poor Uncle Tom wrote: »

I'm afraid you've lost me here martinn123,

Sorry about that
assume, single storey house, wall plate at 2200mm
extention, dwarf walls 600mm, and frames brings it up to up to 2200mm
gable front, or indeed a hip roof, at 25 deg, so depending on width, ridge height maybe 3000mm

according to your post, walls cannot exceed 2200mm at the front, so how does that work, with a gable front.
attaching to house, it needs a Hip back, with a Box Gutter or lead valley.

Hope that explains what I experience on designing an extention to a bungalow
Cheers

BryanF

OP, why not broaden your idea of what your sunspace could be
what about a mono pitch roof extending out from your existing home, allowing light in but blocking the midday sun.. http://www.irisharchitectureawards.ie/index.php/annual-awards/2008/tuath_na_mara/
there are loads of on-line magazine directorys for ideas
http://www.homedsgn.com/tag/contemporary-addition/

Poor Uncle Tom

martinn123 wrote: »

Sorry about that
assume, single storey house, wall plate at 2200mm
extention, dwarf walls 600mm, and frames brings it up to up to 2200mm
gable front, or indeed a hip roof, at 25 deg, so depending on width, ridge height maybe 3000mm

according to your post, walls cannot exceed 2200mm at the front, so how does that work, with a gable front.
attaching to house, it needs a Hip back, with a Box Gutter or lead valley.

Hope that explains what I experience on designing an extention to a bungalow
Cheers

Using your example here only a hip at the rear is acceptable without getting planning permission. The 'front' of your extension would be the existing back wall of the house so the side planes of the roof would pass right over those areas to form valleys with the existing roof. In this case the 'front' gable is inside the roof structure of the extension and would not impact on the SI interpretation. So planning permission would only be required in this case if you were using a gable on the 'rear' wall of the extension.

livEwirE

Thanks for all the suggestions and ideas here guys, keep them coming!