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Standard 3-0 x 7-0 Door Sale

Note: This is an archived page and is no longer available. For current information visit us online at:

Sing Core has a long history of solving the most challenging obstacles in thermally insulated doors made of any flat material that can be guaranteed true flat and stay flat for 50 years. Our doors are highly unique one-of-a-kind solutions that are used in the most exclusive (and expensive) structures around the world.

That is, until now. There has been an sharp increase in the demand for standard Sing doors that could be used in more traditional residential applications at a price that is in-line with other quality doors that are commercially available to the public but do not have all the characteristics that are unique to Sing doors.

Introducing Standard 3 0 7 0 Sing Doors

Sing Core is raising the standard of all doors by offering Sing Standard Doors that are available from any door company or lumber supply. For virtually unlimited door options, see even More Doors.


Click to Order Now

Click to See Standard 3 0 7 0 Door Specs

Sing Doors May Look Like Other Doors

Even though Sing Standard 3 0 7 0 Doors may look like other doors (because we can duplicate the look and feel of any door style) looks are only skin deep. The real difference between Sing doors and any other commercially available lies deep beneath the skin in the heart of the door itself. The core value of Sing door core imbues the door with a set of unique characteristics that cannot be found in any other types of doors.

3-0 x 7-0 Flush Door

Our standard 3-0 x 7-0 doors are framed for hanging by the door company or millwork you choose.



For instance only Eco-friendly insulated Sing 3 0 7 0 doors are lightweight, high-strength, sound deadening and can feature any exterior material surface or look and appearance. Sing doors are the only doors that use a high-precision core (within .006 inch) that can be guaranteed to be true flat and stay flat, not to warp, rot, bend, twist or otherwise fail for 50 years.

Standard Door Sizes

Your standard 3 0 7 0 door is available in your choice of standard thicknesses:

  • 84″ x 36″ x 1 3/8″
  • 84″ x 36″ x 1 3/4″

(For other door styles and sizes, click here.)

Standard Door Materials

All three standard door styles and sizes (above) are available in your choice of three surface material types, paint grade, veneer, and natural wood stave, to better suit your application(s).

Standard doors are available in

  • Paint Grade (Birch ply)
  • Birch Veneer
  • Oak Veneer
  • Mahogany Veneer
  • Natural Wood Stave (check for availability)

Standard 3 0 7 0 Doors

All standard 3 0 7 0 doors are provided as door slabs only. Standard lock blocks are installed on both sides of door. No hardware, such as hinges or doorknob is included. Standard 3 0 7 0 doors are not available pre-hung from Sing Core. See your door company, finishing, adding hardware, and hanging door is the responsibility of the door company or millwork.

Interior doors available in 1 3/8″ or 1 3/4″ thickness w/R 3.5 per in. insulation. Exterior doors available in 1 3/4″ only w/R 6.5 in. insulation.
Prices do not include shipping, handling, or crate.

One Price Fits All

Sing Standard Doors are all the same price. Choose from Birch, Oak, or Mahogany veneer doors; all the same price. Also select your choice of standard 1 3/8″ or 1 3/4″ thick door (for even more strength and insulation) at no extra cost.

Enjoy getting the lowest prices on the best standard 30 70 doors available by participating in our special get acquainted offer. You can have our standard 3 0 7 0 door ready to pick up at your favorite door company or millwork and have the same Eco-friendly high quality doors that out-perform any other insulated doors in terms of lightweight and high strength.

Where to get Standard 3 0 7 0 Sing Doors: From your local sellers of doors or any of your favorite front door manufacturers.

Standard lite cutouts available (1 style cut-out per block. 10 piece minimum). Choose from style number 1-8.

Submit Form for Introductory Discount Price

Submit the following form to receive your special discount wholesale price on Standard 3 0 7 0 Sing Doors and pass the savings onto your customers.

Custom Standard Doors

For an additional charge, Sing Standard Doors can be customized to meet your specifications. As a custom order, you may specify any door type, light cut out / window openings, dimensions, characteristics, composites or door surface material.

Custom Sing Doors are available in any size – even large oversized doors – and Premium Sing Doors can be true flat and guaranteed to remain true flat, not to warp, bend, twist, cup or otherwise fail for 50 years.

For pricing on Sing custom doors, see: Pricing for more information.

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Standard Door Sizing Tiers

Although SingCore makes doors of any size and many are extremely large, oversized doors, there are several size plateaus that affect pricing tiers of the Sing Doors you may desire.
The only 50 year warp-free guarantee and full structure warranty

standard-size-button-singcore single-oversize-button-singcore
double-oversize-button-singcore triple-oversize-button-singcore

Standard Sized Doors

Standard sized doors include any standard sized door that you might purchase over-the-counter, such as the most popular sizes:

Door Height Door Width
6′ 6″ 2′ 0″
2′ 4″
6′ 8″ 2′ 8″
2′ 10″
7′ 0″ 3′ 0″
3′ 6″
8′ 0″ 4′ 0″


32x 80x3

32″ x 80″ x 3″


38 5/16″ x 91 27/32″ x 1 3/4″


33″ x 96″ x 1.5″


35″ x 84″ x1.25″


43.375″ x 96″ x 1.5″


40″ x 94″ x 1.25″

When a door measurement, exceeds either 8 ft. tall or 4 ft. wide, oversize pricing applies such as

Single Oversize

Oversized pricing is based on 4×8 increments. So a “Single Oversized” door could exceed either 8 feet tall or 4 feet wide, but not both.


88 1/4″ x 96″ x 1 3/4″


41.69″ x 105 1/8″ x 1 3/4″


71″ x 95 3/16″ x 2″


56″ x 84″ x 1″


60″ x 96″ x 1 3/4″


54″ x 73.5″ x 2″

Double Oversize

Double oversized refers to doors that are both over 8 ft. tall and 4 ft. wide.


51.5″ x 114″ x 2″


57 1/8″ x 99 3/8″ x 1 3/4″


56 9/16″ x 108 5/8″ x 2 1/4″


86″ x 108″ x 2″


59.625″ x 117.5″ x 2.5″


91 1/2″ x 108 1/16″ x 1 3/4″

Triple Oversize

Triple Oversize refers to large doors that exceed 8 ft. in both directions length (height) and width.


108″ x 114″ x 2″


102″ x 110 1/2″ x 2″


98″ x 118″ x 2.25″


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Pricing for Homeowners

sing sandwich 4x8x1 4 ft x 8 ft x 1 in torsion box panel lightweight high strengthMany educated homeowners demand that their trade professionals use SingCore products in their home projects.  (See our Homeowner’s page for more information.)
Regrettably, we are unable to provide patented Sing products for retail or directly to homeowners as we only support architects, millworks and door companies. See full apology.

Get your free eBook: How to Build with Sing Core

To Get Sing Core in Your Home

  1. Know what you want
    1. Have at least an idea or drawing of what you want
    2. Determine how many and what size of panels you will need for your project
    3. Know what exterior material you want on your panels
  2. Decide how you will manufacture your project
    1. Seek out a professional
      1. Architect, Designer, Design/Build, General Contractor, Mill Work, etc…
        1. Give them your drawing
        2. They will deal directly with us

  • Congratulations!
    1. You are the proud owner of your new completed project that is
      1. Eco-friendly
      2. Lightweight
      3. High-strength
      4. Insulated
      5. High-performance (non-warping true flat doors, walls, furniture, etc…)
      6. Will last longer than anything made with any other material with these benefits

Ordering through your local lumber yard saves on shipping and crate costs. When they send your order to Sing Core, we will ship your items directly to them where you can pick it up. Some may agree to ship to your home.

Since Sing Core is a manufacturer, we do not provide customer support for retail clients. If you are looking to build a tiny house, carriage door, etc., please seek out qualified trade professionals (such as architects, general contractors, mill-works, door manufacturers, and woodworking professionals) for help using Sing Core products for your project. Sing Core is the manufacturer of our patented invention and as such we are not qualified or staffed to teach all the uses for, or handling of, Sing Core building materials.

Sing Core does make the best reinforced structural insulated panels (RSIP) for use in applications such as walls, floors, ceilings and roofs; however, we offer no support or training or guarantee for unskilled users of Sing Core products.

Note: We do occasionally offer products direct to the do-it-yourselfer, like our free Tiny House e-book. Although we may provide the materials, we offer no “how-to” support to the DIY enthusiast except that which is available via our Tiny House FAQ (frequently asked questions) and our free tiny house e-book.

Lightweight high strength insulated Sing panel samples direct from manufacturer

Click (above) for Sing Panel Samples

For more information click Tiny House, No Permit for 800 sq. ft. Houses.

Home Owner Resources:

Home Owners

Free eBook: How to Build with Sing Core

Sliding Doors for Homeowners

Take a look at some Sing Homes (made entirely of Sing products)




















Note: Sing Core products are available wholesale only to professional trade professionals, architects, designers, design/build, general contractor, mill work, lumber yard, distributors, door reps and industries.

Best Selling

Our most popular standard product:

Sing Sandwich Core 2x4x1 2 ft x 4 ft x 1.5 open edge

Sing Sandwich Core 2 ft x 4 ft x 1.5 in open edge

Sing Sandwich Core 2×4

48 in. x 24 in.

Sing Sandwich 2×4 is a 2 ft x 4 ft pre-built reinforced torsion box substrate that is 1.5 inch thick and features a lightweight plywood surface material that is easily bonded with other products. It’s universal convenient 2 ft x 4 ft size is easy to handle and transport and ships in minimum 4-piece bundle.

It’s a standard Sing Sandwich 4×8 pre-cut into 4 pieces that you can throw in the front seat of your car and turn into anything for endless applications.

The Sing Sandwich Core 2×4 is by far the most versatile Sing product to be released to the world.

Note: Sing Sandwich Core 2×4 is only available in 1.5-inch thick 2 ft x 4 ft size with lightweight plywood facings.

Minimum order $4,000 on 2×4 (48 in. x 24 in. x 1.5 in.), crate optional. For any other alteration, see Sing Panel

sing sandwich 4x8x1 4 ft x 8 ft x 1.5 in torsion box panel lightweight high strength

Sing Sandwich Panel 4 ft x 8 ft x 1.5 in open edge

Sing Sandwich Panel 4×8

96 in. x 48 in.

The Sing Sandwich 4×8 panel comes in standard 4 ft x 8 ft size panels, with 1/4″ plywood skin:

  • 1.5 inch

Minimum order $4,000 on Sing Sandwich 4×8 (96 in. x 48 in. x 1.5 in.). Final price includes shipping and crate.

Standard exterior surface material is lightweight plywood making it easy to apply other surface materials using standard carpenter’s wood glue and clamps.

Sing Sandwich features no solid wood edging, are unfinished and may be edge-banded to hide the visible exposed Sing Core material.

See: Sing Sandwich for more information

See also: How to Close the Edge of Sing Sandwich

The most economical way to access the Sing Core product line it to utilize our basic building material which would be our standard 4 ft. x 8 ft. sandwich panel (like the one[s] featured above). Anything else would require a custom order, please see “Custom Sing Panel” that follows.

Base price does not include shipping, crate and/or handling charges depending on quantity and stock on hand.

Custom Design Your Own Sing Panel

Sing Panel 4 ft x 8 ft x 1.5 inch with embedded solid wood edges

Sing Panel 4 ft x 8 ft x 1.5 inch with embedded solid wood edges

Like our regular custom clients you must know:

  1. What Size Sing Panel (the length, width & thickness) You Want
  2. What Exterior Skin (lightweight plywood is the default) You Want
  3. What Size Solid Wood (standard 1.5 inch) Edges (or specify other material)
  4. How Many Sing Panels (affects ship & crate cost and quantity may qualify for extra discount)
  5. Do You Want Untrimmed (default) or Trimmed
  6. How the Panel Will be Finished (all Sing Panels are unfinished)

Once you have provided the necessary information, they will be able to make sure you get the custom Sing Panel that you desire.

Regularly stocked items have a 1 week turnaround (continental USA) while custom Sing Panels have a 4 to 8 week turnaround. Since all Sing Panels are unfinished, we suggest that you contact a local high quality millwork to do the finish work on your Sing Panels to achieve satisfactory results.

You asked for it; Sing Core gives you what you’re looking for. –>


Standard Professional Trade Show Panels are 90 inches tall, 2 inches thick with pre-primed HPL, available in the following sizes only:

Panel A: 30 inches wide, cam locks installed

  • Regular Price: $576.00, see Lowe’s Pro Desk for special discount price
L connector illustration drawing for standard sing trade show panels

L Connector illustration

Panel B: 24 inches wide, cam locks installed

  • Regular Price: $440.00

Panel D: 30 inches wide w/door, cam locks installed

  • Regular Price: $976.00

L Corner: 2 inches wide. Attaches two panels together, cam locks installed

  • Regular Price: $220.00

T Corner: 2 inches wide. Attaches three panels together, cam locks installed

  • Regular Price: $330.00

Special Professional trade show panels (above) are available ala carte; pick and choose what you would like. Pre-design and pick out the components you want from the above list only. Enjoy the savings and free shipping.

Free Shipping offer only available for professional trade show panels (above).

Remember, you can create your more economical DIY trade show booth using standard Sing Sandwich panels available in convenient 4 ft. x 8 ft. size.


Custom Order or purchase Sing Panel please click here —this is only for the trade professional or qualified business-to-business and not available elsewhere at this time.

Sing Core is in the business of providing high-end true flat solutions to the most exquisite architects, designers, millwork, and industrial suppliers in the world. We only provide these services to our commercial accounts.

To obtain a custom order product (anything besides 4×8 or 2×4 Sing Sandwich) see your local trade professional, millwork and/or door company and tell them that you want, “Sing Core inside.” We can work with them to make sure that you get what you want.