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Chimney Design


The service

We have been designing twin-wall chimney systems since 2007 (in winter we will often do 5-10 designs a week).

We use our own twin-wall design software which is accurate to within millimetres.

Just drop us an email using the Contact Form (orange button right side of site or in footer) to express interest and provide your email. Ideally let us know the answers to the questions below (see QUESTIONS FOR YOU).

Once we have corresponded via email and have the answers to our simple questions we will request a half dozen or so simple measurements and from this we can create a quote.

Peace of mind

Design process includes any design changes as required should the need arise.

Telephone support during all stages including installation phase.

We do not charge for the design process - just for the parts.

Questions we will ask you

Need a quote? Just answer these questions and send to info@stovefitterswarehouse.co.uk and we will be right back to you:

    Is the property the stove being fitted into separate from the main house e.g. shed, garage, boat, caravan, garden office? If yes then which is it?

    If "none of the above" fits, is the property a bungalow or a two storey house? Please state which or explain if different.

    Is the chimney staying internal within the house and going out through the roof? Or will it exit through the wall and be attached to the wall outside of the house?

    If passing outside the house, is the chimney on a Gable End (pic of white house below shows chimney on gable end)?

Once I have the answer to these questions I can present a few example drawings by return email and at the same time request a few simple measurements. I will strive to keep the whole process as simple as possible.

Kind regards,
Julian Patrick

01492 535 852


All parts are Duraflue, a premium brand as chosen by many UK installers.

Easy-fit bracketing system.

Black or silver - you choose. We will quote for both.



Fast turnaround within 5 working-days.

Please check out our reviews at the foot of this page.


What is included?

Included is everything you need to do the job except for cosmetic finishing plates (many people do not bother with these but you may wish to order these as a separate item).

Wall brackets are included except in Scenario 1, 3, 5, 7, 10 (floor plates used where appropriate here.


A rough guide (silver 5"):

Shed £300-£400
Bungalow internal £500-£700
Bungalow external £600-£900
Two-storey house internal £800-£1000
Two-storey house external £900-£1100

Extension but chimney attached to main house £1000-£1200
Extension but chimney separate to main house £500-£700

Black add 20%. 6" add 10%


Don't worry if your property differs from the norm - often we can make it work.

Building regs

Designed and checked to UK building regulations standard by Julian Patrick, author of the Stovefitter's Manual.

Note from Julian (author, Stovefitter's Manual): BEWARE of cheap designs from some companies - they often use inferior materials and often do not know their regulations - leading to failed sign-offs and raised stress levels.

Video: simple guide to chimney design rules



Review by Hetas registered installer D. Parker: Firstly – Dura Twin Wall is brilliant to use and the kit is absolutely fantastic! Better than Dinak and Poujoulat. Will be doing a brilliant review once finished. Full review here.

Review by Leon - ELB Fireplaces: The products are the best I've ever used. The flue liner is extremely strong and with its multi direction flow it's perfect. The Duratwin twin wall is for me their best product with its push together system not twist and lock it makes life an installer that bit more easier. It has reduced the installation time which is a big bonus to any company and with the sleek black finish it just finishes the job perfectly. I would advise any company to give it a try.

NUTEC Stove & Kitchen Company Ltd : We have now used Duraflue Twinwall on 5 jobs and continue to be impressed with both the sturdy design as well as the quality of fit, especially when compared to other models available. We have just about used part and will continue to do so going forward as nothing comes close. Really impressed with Julian and Arran who constantly look after us.

Customer Reviews

Based on 149 reviews
Good Service, helpful team!

Order number: 10623
My First contact with Julian was through his design service, although I only purchased the "Slow version" as time was not an issue it still came back much faster than the time limit.
I accepted his offer and the items arrived fast by a very helpful delivery service, very well secured on the pallet and all was well. Some items were different to the original specifications, although Julian had explained this in advance, on fitting, I did need some alternative Items, they were sent out the next day at no extra cost!!! All this despite Julian having a personal family problem, big thumbs up on that level of service.
I fitted the stove according to the design specifications & happy to say I now sit here in a very warm conservatory, complete will Build Controll Controll completion certificate, writing this review.
Overall a good level of service, backup when you need it & goods well worth the money!!!

stove fitting made easy

I'd always wanted to fit a stove to my conservatory to make it useful all year round. But the cost of having one fitted put me off. I thought about doing it myself, however was nervous especially about cutting a hole in my roof and getting it right. Following a few calls to stovefitters they were patient and brilliant witl lots of advice and design guidance specific to my house and layout. The goods arrived very quickly and are well made. My son and I fitted the stove and chimney and all is well with a lovely stove supplied by stovefitters and fitted by yours truly.