extension - internally pitch/ slant roof or straight roof?

Happytosave

We are having a single storey 4m extension. It is for a kitchen and dining room. The length is 6m.
The pitched roof is already on but we need to decide if
we should keep the internal ceiling flat which would extend from the current line of the house. Or should we go for a pitched internal ceiling, keeping in line with the new extension roof.
There are two velux windows. I like the idea of the pitched ceiling as it gives a feeling of more space but I am not sure if it would take a lot longer to heat up.
Any advice pls?

tony6403

You are right that there would be more space to heat so it comes down to whether or not you like the impression of space and increased light created by a vaulted ceiling.

ds1980

we had exact same predicament and chose to drop ceiling but no idea why! Cheaper to insulate and heat I think although it cost more to do than we'll save I'm sure! Easier to finish and decorate and goes with rest of house. Would be interested to know other people's thoughts also although not much I can do now!

phoebe1989seb

In our last house we built a 6.5m x 5m kitchen and utility extension and opted to have a vaulted ceiling, but that was primarily due to the design put forward by the architect that included a double-height window in the kitchen to rake advantage of the view.....

We had two large school-type cast iron rads (but not underfloor heating) and had no issues with heating the space (mind you, the insulation required by building regs helped a lot!), which, once opened up to the rest of the kitchen was 11.5m x 5m, so a fairly large area

Tucker

I much prefer the pitched internal one, especially if there are velux windows. I don't think they are anywhere near as nice in a level ceiling.

DRP

Defo go for a vaulted ceiling. It's just ... nicer

manda1205

Ours is vaulted. We did a 5x4m rear extension for a new kitchen, we also knocked through into the old kitchen so we have kitchen/diner/sitting room as its a big area. We have 2 roof windows too but also a small flat roof area where it sits underneath the upstairs bedroom, so our ceiling might look odd to some, but we love it. Its not hard to heat the space up and it was lovely in the summer last year, as so much light and space. I would say just do it, it's nice to be slightly different and not a bog standard square room.

ds1980

:rotfl: regrets decision! :rotfl:

Furts

From a money saving perspective, the vote has to be for a flat ceiling. I say this because trussed rafters can be used - cheap to buy, readily available in most areas and semi-killed to install. The insulation can be fibreglass which is cheap and then simply rolled out above the ceiling. Ventilation, any membranes, and condensation control are straight forward.

From an appearance perspective an open ceiling to the undersides of the rafters is a matter of taste, but I like it. However, there is the issue of heating, and also of heat losses. It is easy to put 500mm fibreglass above a ceiling - an equivalent on an open ceiling is expensive and awkward. (I say this because I am not a fan of multifoil insulation.)

Grimbal

This is from our old house, where we too built a 4m single storey extension with veluxes in a vaulted roof. It did take longer to heat, but marginally compared with a flat roof. I loved the look of the sloping ceiling & would do it again if I could !

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arbrighton

Our extension has vaulted ceilings. They've been a mare to paint but with the underfloor heating keeps the rooms a pleasant temperature. The utility room would have felt very claustrophobic with a flat ceiling- we did try it out with the builders