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Chimney Design


No stress 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.

Choose your design and we do the rest.

We may request extra payment if your property falls outside of normal parameters or if the Scenario you have chosen is incorrect (some customers have called their beloved bungalows "sheds" to strive to keep costs down ;-)

Peace of mind

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

Telephone support during all stages including installation phase.


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

Easy-fit bracketing system.

Black or silver - you choose.



Fast turnaround within 5 working-days.

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


What is included?

Prices quoted are for Silver 5" (interior is 5"). Choose to pay a little for black and/or 6" at top of page.

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.

If your roof is 40 degrees or more and your chimney is more than 1.5 metre from the ridge "might require" roof bracing and this is not included. Please ask if unsure.

What is not included?

Wall brackets are not included in Scenario 1, 3, 5, 7, 10 (floor plates used where appropriate here) but wall brackets are included in other scenarios.

If your roof is 40 degrees or more and your chimney is more than 1.5 metre from the ridge "might require" roof bracing and this is not included. Please ask if unsure.

Wall fixings (e.g. screws and rawplugs) not included.

Wall sleeve and wide locking band not included.

You will be provided, with your chimney plan, a list of optional extras you might wish to consider.


Don't worry if your property differs from our "Scenario Examples": we can work with your images/diagrams/sketches (all of which can be attached using our gizmo below or emailed to

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.

1: Choose your property type 2: Add to basket & make payment 3: Provide measurements below 4: Click SUBMIT.


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 145 reviews
Excellent service and product

I contacted Stove Fitters Warehouse for a flue for a new stove we were having fitted. The team were very helpful and all I needed to provide were a few basic measurements (no technical knowledge needed!) for them to design and specify a flue for me. Once ordered, the flue parts arrived quickly and securely packaged on a pallet, once unpacked they slotted together easily and clipped firmly to form a good looking and structurally solid flue. I would definitely use this firm and product again.

Flue pipes

I have been recently building a log cabin and decided to install a log burner, having shopped around I decided to purchase from the stove fitters and I am glad I did, from when I first made the call to the delivery the service was excellent.

So If you are thinking of purchasing a stove or flue then don’t hesitate to contact the above you will be glad you did, five stars all the way👍👍👍