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20×20 Lean-To Plan


If you are looking to build an impressive structure that captures the sun, look no further than this 20x20 lean-to plan! The single-plane shed roof soars up to 16’-9”, creating a high-volume space. That big roof surface would make a great place to mount solar panels with proper orientation. Thanks to the central parallel chord truss, the 400 square feet is a clear span with no central post, so you can utilize the entire space as you wish! The four-foot deep bump-out adds more square footage and dynamic shape to this stunning 20x20 shed roof plan!

  • 4 in 12 roof pitch
  • 400 square feet with 40 square foot bump-out
  • Room to add loft in future
  • Perfect for farm storage, artist’s studio or small cabin

There are two drawing sets to give you all the information you need to build this 20x20 shed roof plan. Both sets are ready for instant download once you make your purchase. The first five-page set is formatted to be printed on 24x36 paper. These five pages include a 3D exploded isometric showing how the parts of the frame relate to each other. Then there are detailed and dimensioned plan, section and elevation drawings of all parts of the frame. We also include full timber and fastener lists, so you can budget for and purchase your materials easily. The second 33-page set of drawings is formatted to print on 11x17 paper. It shows each cut on every timber in the frame, so there is no guesswork involved!

Frequently Asked Questions

Do you offer the whole kit?

Yes we do! Just fill out the form HERE and will will be in touch soon with more information and pricing.

Can  you modify this plan for me?

Yes, we can modify our plans to the size you need on a custom basis. For more information on the services that we offer and how the process works check out the page HERE

 If that is something that would interest you, fill out the  brief questionnaire HERE or click Get Started Today on the main Design Page from above.  

As soon as we get your information and give it a quick review we’ll contact you to schedule a phone meeting.  Please allow a few days for our team to respond.

Before our discussion, we urge you to buy the set of plans that most resembles the alteration that you seek. This will allow you to study the plans thoroughly, think through any other changes or design aspects that you want.

Are your plans engineered?

The plans we offer on our website are not stamped by an engineer. People build our frames all over the country, and in each location, there are different requirements.  Timber species, design loads and values needed are just some of the factors engineers need to take into account in each case.  

We do offer engineering services as an add-on to our standard plans. If this is something you are interested in, head HERE and fill out the brief questionnaire.  Armed with that information, we can get our heads into your project before we speak.  That way we are best prepared to answer all of your questions.

As soon as we get your information and give it a quick review we’ll contact you to schedule a meeting.

Have a question for us?

100% Money Back Guarantee for 30-Days

Purchase With Confidence...It's Risk Free!

If, for any reason, you don't like this plan, you can get a full refund anytime within 30 days after your purchase. If you have any issues, just get in touch with our support team and they'll either help you out until you get the results you need or give you a swift refund.

Important Information and Plan Licensing Agreement:

  • Timber Frame HQ provides plans for construction purposes but does not oversee the construction. The plan purchaser is responsible for assuring the plan meets local codes and regulations. It is the responsibility of the plan purchaser to obtain any and all structural analysis, engineering and specifications that may be required in the municipality in which it is to be built. Plan purchaser is to verify all measurements before construction.
  • Timber Frame HQ grants you a non-exclusive, non-sub-licensable and non-transferable license to use the plans purchased from the Timber Frame HQ website.
  • This License is personal to you only. You may not use the License for any other purpose except for personal purposes.
  • When you purchase a set of plans, you are purchasing a limited copyright license for a design giving you the right to build that structure one time at your location.  Only you may use the License, and such use shall be limited as stated above.
  • All materials provided under this License are owned by Timber Frame HQ. Any License granted under this Agreement shall only convey a non-exclusive, non-sub-licensable, and non-transferable right to use the plans in accordance with the full terms of this Agreement.
  • You are expressly prohibited from creating any derivative works in the plans or permit any other person to create any such derivative works. You are further expressly prohibited from reproducing* the plans in any fashion on any medium, except printing the plans directly from the PDF's you will receive. You may not modify the plans. Your License does not allow others to represent our design work as their own.
    *Please note:  You or someone else can print the plans for planning and construction use.
  • Your License does not allow others to represent our design work as their own.
  • Timber Frame HQ specifically disclaims and warranty that the plans will be error free and will not be responsible for any loss suffered by you because of the plans or otherwise.
  • Any commercial use of the plans is strictly prohibited.



  • 20’ wide by 20’ long outside of post to outside of post plus 10’x4’ bump-out
  • 2’ overhangs front and back; 1’-5 ⅞” overhangs on sides
  • Height to Top of Lowest Plate 9’-0”, to Top of Highest Plate15’-5 ½”
  • Height to Peak of Roof 16’’9 1/2” with 4:12  Roof Pitch


  • Posts –8×8
  • Collar Ties – XxX
  • Girts–6×8, 6×10
  • Rafters – 4×6
  • Plates – 8×10
  • Struts  –4×6
  • Braces – 4×6, 4×8


  • 39 pages total
  • Construction Drawings – 5 pages (22×34)
  • Detailed Piece Drawings – 33 pages (11×17)
  • Timber List – 1 page (8.5×11)

30-Day Guarantee

We are so confident you’ll love the plan that we stand behind it 100% with our 30-Day Money-Back Guarantee. You have 30 days to initiate a return with us for any reason.

It’s the best Return and Warranty Policy of any company. You can buy from us with full confidence that we’ll be here to help if something goes wrong or the plan doesn’t work out for you.

Return Policy

Our money-back guarantee gives you 30 days to decide whether this plan is everything you hoped for. You can return it for a full refund if it’s not working out. Here’s how that works:

Email us within 30 days of placing your order. We will refund you the full purchase price of this plan.

And remember, if you have any issues with your plan, even if you’re not sure you want to return it, please contact us personally. We want you and every other Timber Frame HQ customer to have the best possible experience with us.

Please note the 30-day Guarantee is for individual plan purchases and not for our Timber Frame Plan Bundle or other plan bundles for which we do not offer refunds due to the nature of the product.

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