Quote for roof with lantern/upstand ok or expensive

28 Jun 2005
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United Kingdom
Hi Can you help me with this quote guys, is it about right or excessively expensive?

My reaction was its excessively expensive but then I am not the builder pricing things up. I have some understanding coming from a Building Services background as a qualified electrician now retired.

I have a flat roof covered in felt and chippings 6.3m x 3.8m. It’s on a ground floor extension which is attached to the back of the house and has some lead flashing along its 6.3m attachment to the house.

It’s well overdue for renewal. As we want a bit of an overhang (with soffit and guttering) the new roof will be 6.3m x 4.1m. And because we want a large lantern hole and the extra overhang it is not worth keeping any of the existing timbers.

We want a new fibre glass roof.

We want a 4m x 2m opening with an upstand so I can fit the lantern. I am buying a self-build and fit lantern. We also want it to be a warm roof (advised by the council to make up for any extra heat losses).

I will do all electrics too. The lantern weighs about 242kg.

I asked the builder to do everything including dealing with the council for permission if needed and any structural calculations, I want to be free from that and make that the builders problems so that at the end I get a new warm type, fibre glass roof with a 4m x 2m opening ready for me to fit the lantern and do the electrics.

The company I got the quote from is highly rated on Checkatrade and the reviews read well.

Here is what they have supplied me with as a quote

Re: Structural alteration of flat warm roof over kitchen at the above address (quoted with no drawings provided)

We have pleasure in submitting our estimate for the above. This includes the supply of all labour, materials and plant.

Works to be carried out:

· Remove and dispose of old roof over kitchen including joists and plasterboards

· Build flat roof out of 7” x 2” treated timber putting in double trimmers as required leaving opening 3000mm x 1200mm flat roof lantern

· Insulate roof with 129mm warm deck, felt roof with 3 layer system

· Install lantern supplied by client

· Plasterboard ceiling then plaster

· Install white UPVC soffit and faciers

· Install new half round guttering

· Clear site of any debris

· Do any making good

Time frame approximately 4 days

Total cost of all works, labour and materials will be: £7,850.00 inclusive of VAT @20%

He has got the opening wrong,on this quote but not sure how much difference that will make. He has also stated he will fit lantern so after your comments I will go back to him about corrections in price for me fitting the lantern and the opening sizes etc.

Also I should mention we discussed whether steels wer needs with the large span of 4m but he was not worried about that and said we will sort out whether they are needed or not.

From the high rating and reviews I have every confidence that his team will do a good job but that price seems too high.

Any help/advice appreciated.
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You can't trim out a 4m stretch with double joists at 4m length.
Checkatrade is weighted towards the trade, they can buy good reviews and hide bad reviews.

This is not to say he's talking bs just take the rating as a pinch of salt.

Maybe the 8k included the lantern? As I'd expect maybe 4-6k for the roof.
£6,500k plus the dreaded.

Sounds about right to me.

Just throwing a few figures at it:

Demolition + skips.£500

Form new structural roof with upstands, firrings etc.
Insulation and decking boards £2,500

Form fascia and soffits £600

Supply and fit gutters £300

Flat roof £1,000

Plasterboard and skim inside £500

It soon adds up!

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