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Monitor Barn House
Monitor Barn House
40x42 Monitor Barn House Plan Isometric
40x42 Monitor Barn House First Floor Overview Rendering
Bedrooms and Bath on the 40x42 Monitor Barn House Second Floor Plan
40×42 Monitor Barn House Plan- Birdseye Isometric
40×42 Monitor Barn House Plan - Exploded Isometric
40×42 Monitor Barn House Plan - Roof-Close-Up
40×42 Monitor Barn House Plan - Roof-Detail
40x42 Monitor Barn House Plan - Plan Overview
40x42 Monitor Barn House Plan- Piece Overview
Great Room in Monitor Barn House
Bedroom in 40x42 monitor Barn House

40×42 Monitor Barn House Plan


SKU: 43615 Categories: , , , Tags: , ,

If you are wanting a sizable structure with great presence and utility, look no further than this 40×42 monitor barn house plan! True to this style of barn, our plan has a large center aisle with shed wings on both sides, and a second level above the center aisle.  We have designed this to fit on a 40×42 foundation after the addition of 5 1/2″ Studs, and 5/8″ furring strips behind the posts for drywall to be installed.  You can enclose the entire structure, or leave one of the wings open for a comfortable porch.

With this package, we include architectural plans fleshed out as a four bedroom home with vaulted ceilings, large kitchen and living areas, and even a mud room!

  • Outside to outside of the posts measures 38’-11 ¾” x 40’-11 ¾”
  • With cladding, square footage is approx. 1680 first floor and 650 second level
  • Roof pitches 8:12 center aisle, 4:12 shed wings
  • Height to top of center rafters: 24’-10”; height to top of shed rafters: 13’-3”
  • Height to top of center plates: 19’-7”; height to top of shed plates: 9’-6”
  • Plan utilizes 9009.3 board feet
  • Mortise & tenon, spline and scarf joinery

As soon as you purchase this plan you will receive links to download the PDFs. The construction set contains 13 pages of detailed information. There are 3D drawings so you can visualize the finished frame, including a production drawing with every timber labeled. There are post, loft and roof plans, elevations and section drawings. And there are plenty of notated detail drawings explaining the complexities.  The piece drawing set contains 47 pages, showing you all the information you need to make the cuts on every timer. And we include connector, parts and timber lists to make procuring your materials easier.

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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:

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.

Plan Licensing Agreement:

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 reproduction or modifications of our designs, 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.



  • 38’-11 ¾” wide by 40’-11 ¾” long outside of post to outside of post
  • Height to Top of Plates: 9’-6”, 13’-3 15/16” and 19’-7 1/16”
  • Height to Peak of Roof 24’-10 15/16” with 8:12 and 4:12 Roof Pitches


  • Four bedrooms, 2 1/2 baths
  • Living, dining, large kitchen, laundry and mudroom
  • 1680 square feet first floor, 680 square feet second floor for total of 2360 s/f


  • Posts – 8×8
  • Girts – 8×10, 8×12
  • Plates- 6×8, 6×10, 8×10
  • Rafters – 8×10, 8×14
  • Braces – 4×8


  • 66 pages total
  • Construction Drawings – 13 pages (11×17)
  • Architectural Drawings – 5 pages (11×17)
  • Detailed Piece Drawings – 46 (11×17)
  • Materials Lists – 2 pages (8 ½ x 11)


We are happy to modify and update the drawings to your specifications. We can adjust the footprint, roof pitch, overhangs, and overall heights. These will eliminate your mistakes in modifying an existing plan to meet your needs.

A couple of notes and requests:

  • Our design services are $85 per hour. Engineering services are $200 per hour. We have a minimum charge of $500 for our design work.
  • Lengthening (parallel to the main ridge) is more affordable than changing the width or adjusting the roof pitch.
  • Once you have purchased the plans and have reviewed them, please fill out the form below. It will get you into our system, and one of our team members will get back to you with an estimate for our services. Please include any of the following changes to the form’s “Other Project Info” section.
    • Overall width and length that you are after from the outside of the posts.
    • New 2nd Floor Framing Height
    • New KneeWall Frame Height (from 2nd-floor framing height to top of the top plate?
    • New Overhang Dimensions both for the sides and ends?
    • Any adjustments to the Roof Slope?

Fastener Kit

Procuring the hardware for your project is easy with our timber frame fastener kit!  Just purchase what you need from Timber Frame HQ with one click!  You don’t need to scrounge around for your pegs or find just the right screws for your rafters and we always throw in some extra just in case. We’ve got you covered!

With this kit, you get:

This kit is tailor-made for use with the 40×42 Monitor Barn House Plan when constructed as a timber frame structure. The kit does not include any post base hardware, which is also available in the TFHQ shop.

Please allow 3-4 weeks for delivery.

Learn More

30-Day Guarantee

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

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

Return Policy

Our money-back guarantee gives you 30 days to decide whether this plan is everything you hoped for. If for some reason it’s not working out, you can return it for a full refund. 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 whatsoever with your plan, even if you’re not sure you want to return it, please get in touch with 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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