Duraflue Twin Wall Flue Chimney Design

Chimney Design (NOW FREE)

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. We strive to make the procedure as simple & stress-free as possible.

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    This is the chimney design service page. If you are on a "preview version of his page please click "View Product" button to continue. This page is only for if you have no chimney whatsoever. There is no need to add this £0 product to your basket whilst the service is free. SAVE £50 ON STOVE WHEN YOU SPEND £300+ ON INSTALL MATERIALS. SAVE £100 ON STOVE WHEN YOU SPEND £1,000+ ON INSTALL MATERIALS.

This is the chimney design service page. If you are on a "preview version of his page please click "View Product" button to continue. This page is only for if you have no chimney whatsoever. There is no need to add this £0 product to your basket whilst the service is free. SAVE £50 ON STOVE WHEN YOU SPEND £300+ ON INSTALL MATERIALS. SAVE £100 ON STOVE WHEN YOU SPEND £1,000+ ON INSTALL MATERIALS.

Leadtime: 1 days

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Free chimney design and materials list to your door within five working days.

- Building regulations compliant
- Detailed quotation
- No obligation to buy

We have been designing twin-wall chimney systems since 2007 (in winter we will often do 10-20 designs a week) and have one person who specialises in this one task. We use our own twin-wall design software (we created it from scratch) which is accurate to within millimetres. We strive to make the procedure as simple & stress-free as possible.

Our software is able to design for flat or sloped roofs, internal or external chimneys and gable ends.

Eager to get your hands on a design? Scroll down to The Design Process below.

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FREE chimney design by an expert? What's not to like...

Julian Patrick, site owner and author of The Stovefitter's Manual

The design process

1. Please read all of this page.

2. If you wish for us to design your chimney please follow the link below "Proceed to add property dimensions, where you will be guided through the process of choosing your desired chimney type and adding your property type and dimensions so we can then input this into our Clickflue software package.

3. During that process you will be able to upload any images or drawings (if you wish).

4. We design your chimney and list all the parts required and provide a quote. Julian or Ray will communicate with you via email if required.

5. You choose whether to purchase.

The video below "How to design a twin wall chimney for a wood burner"  is just six minutes long and may assist you if you are unsure whether your chosen stove location is feasible. The video also explains simple chimney design constraints.

If you have any problems using or understanding the "add proper dimensions" process please email info@stovefitterswarehouse.co.uk. Add any information you feel is relevant. Either Julian or Ray will get straight back to you. With the correct information or a good sketch we can add all the information for you and get a design sorted. All free of charge.

The videos on this page may tempt you into designing your own  chimney system. Feel free to send any drawings to info@stovefitterswarehouse.co.uk and Julian or Ray will check them over free of charge.

Video: 3-minute overview of twin wall system

The basics of what twin wall is (a clip-together chimney system).

Video: 6-minute chimney design video

What you can and cannot do in chimney design. A good introduction that will show you whether your chimney can be sited in a certain location in your property.

Video: 4-minute getting started video

Video: 4-minute video showing how to start your clip together chimney system using the twin wall adaptor or removable length (either of these will be the first twin wall part you will fit)

Customer Reviews

Based on 243 reviews
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J
J Patrick
Chimney kit added 24 June 2025

Live and for sale

J
J Patrick
New kits added

New chimney kits have been added.

D
Dave N
Great customer service from start to finish

Ref 22045
Used the free design service - but a top tip - please ensure you get the design reviewed by the team as not all components are listed in the design. Learnt that the hard way, but the team were quickly on hand to ensure everything was ordered. Even when things went wrong (cause was out of their control) - they were quickly and professionally rectified. Great service!

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