20×24 Heavy Timber Outbuilding

20x24 King Post Timber Frame Perspective

Are you looking for a two-bay garage, guest house, or spacious workshop?   Check out this 20×24 heavy timber outbuilding plan!   With plates over nine feet high and a 6-in-12 pitch, the ridge stands at well over 13 feet for a volume ceiling. However, we include roof pitch drawings from 3 in 12 to 12 in 12, so you can choose the volume you like!

The king post trusses and the knee braces are enhanced with a graceful curve. The spline joinery in the beams and the scarf joints in the plates make this a challenging project you will be proud of. This building is strong thanks to the heavy timbers used in the posts and trusses.

Depending on your roof pitch, there is enough headroom to add a floor over part of the space for a crawl-in sleeping loft or storage. Of course, you may also omit the loft and enjoy the volume the high ceilings add to the space.

The drawings consist of 32 sheets in instant-download PDF format. They include all the pieces and joinery details you need to build this frame. The drawings also include renderings, plans, elevations, and sections. We include timber lists and fastener schedules to expedite finding and purchasing materials. There are also 3D drawings so you can visualize the project. The plan set is formatted in 8 ½” x 11” for easy printing at home or your local copy shop.

Check out this plan in our shop: 20×24 King Post Timber Frame.

Plan Guarantee

Important Information:

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 lot conditions and measurements before construction. Purchaser is responsible for additional expenses incurred in order to meet local code and engineering requirements.

Customer understands that the following conditions in your specific area may require additional engineering:

  1. Wind / hurricane / tornado
  2. Seismic / earthquake
  3. Heavy snow
  4. Flood potential
  5. Soil instability
  6. Timber Frame Engineering

Customer understands that HVAC, Plumbing & Electrical will not be included in all plans.

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. Your copyright license was granted when you paid the purchase fee. You do not have the right to build the design a second time unless you have a signed agreement with Timber Frame HQ. Please note that copyright law protects “derivative works” the same as it protects the original design. That means that making some changes doesn’t make it a new design. We do not allow modifications of our designs by others, without permission. Your copyright license does not allow another professional to represent our design work as their own.

Timber Frame HQ retains all common law, statutory and other reserved rights, including the copyright. This applies even when you have participated in the development of the design to a significant degree.

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27 thoughts on “20×24 Heavy Timber Outbuilding”

  1. I live in mid-Missouri. Tornadoes are the worst physical event for us. Wind is the greatest risk. Will SIPs help with stability?

    Understanding that plan users are infinitely variable in their application and implementation of this frame, what is a reasonable estimate for what is entailed for just the timbers involved?

    I will cut and erect myself. Probably on a poured concrete foundation and floor, with under floor plumbing access and safe room. SIP walls and roof with metal skin on roof. 9/12 pitch.

    Spacious floorplan with guest bedrooms and a full bath on second floor for visitors and grandkids.

    If I like it I will build two. I have three daughters. Some separation is good 🙂

  2. Yes, SIPs will help out a great deal, talk to your SIP company about the fastener schedule, adding more screws will be a big help. If you are working full time by yourself and are reasonably efficient with material handling I would give yourself 3 months if not 4. Can it be done faster, yes, but I tend to be conservative with time estimates?

  3. Katrina Williams

    Kevin, the longest timbers are the bent girts and the plates/ridges. They are 8x10x22 feet. We call for the timbers to be a bit longer than actually required to allow for checking, etc.

  4. Jeff Bakanovic

    Do you have a list of timber sizes and number used? Looking to gather my own logs and mill them.

  5. Hi – can I ask why there is a scarf joint above the brace rather than the main post?

    I would be interested in this plan if the roof pitch allows for a loft (bedroom)


  6. It is better for the scarf joint not to be above a post. Here is why between the posts the unsupported timber will sag or deflect. Over the center post, the timber will crown.
    This causes this “exaggerated” wave shape effect in the timber. At the point where the sag or deflection changes to a crown is called the point of “inflection”.
    This point is where the timber is neither sagging nor crowning. It has the least amount of both forces, that happens to be over the brace.
    The plans come with all the roof pitch drawings from 3/12 to 12/12 and adding a loft is as easy adding to loft timbers. Let us know we can help sort out the loft.

  7. Richard Offermann

    Does the plan show the snow load in the specs? The county planning office won’t issue a permit without this information

  8. Richard Offermann

    Hey Brice,

    I’m looking at this plan for a shop. I can add another bent to get the length I need but county planning calls for a minimum of a 56lb snow load. I will be using yellow and ponderosa pine milled from my lot and I’m thinking of the 6/12 pitch to shorten the length of the rafters (and the size of the timbers I will need to source).

    That being said I would also need the snow loads in writing to satisfy the planning people.

  9. Katrina Williams

    We generally only provide pdfs. We actually do not have Autocad files for this plan. Thank you for asking!

  10. Yes, Gary, you can extend the overhang. It just loses some ground clearance the farther you go out.

  11. Brice
    Silly question other than pure weight is there any reason not to use full lengths for the ridge beams and skip the scarf joint totally
    Thanks Dale

  12. Brice
    Can the post that is offset on the inside of the building by simply switched to the other side it would work much better for my layout

  13. If I used 3 taller beams across the pavilion, would I still have to use the posts in the middle of all 3 beams?

  14. Matthew Stevens

    Yes, it is possible, however, half of the total roof area load comes down the king post and bears on the 20′ tiebeam. The center alone tie beam takes 25% of the total roof load. So it is vital to have an engineer review the tiebeam size before making that modification.

  15. Is the middle post really needed, it would be nice to have an open floor plan?
    Looking for something this size and look to tie into the back of my garage, 12 foot roof peak.

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