Design kits

Standard WikiHouse blocks come in the following categories

  • Wall blocks
  • Floor blocks
  • Roof blocks
  • Stairs
  • Window, skylight & door blocks
  • Lintels that go over openings
  • Bowties to join them together

The WikiHouse blocks can be downloaded in a number of different file types, then opened in the corresponding software package. Blocks can be opened in free software like SketchUp & Blender, licensed software like AutoCAD and Rhino, and any other software packages that can open IFC, DWG, SKP or 3dm. 

The ‘simple’ blocks are perfect for the earlier stages of design, when you’re looking at form and massing. They are quick to use and simple to edit. 

The ‘detailed’ blocks have all the finer detailing within them, perfect for checking junctions and details, and for reviewing how your WikiHouse frame will be assembled. We recommend using these blocks once you have decided on your concept design.

Access the block library here.

How to use the block library

The full block library download file shows all standard blocks in the series.


The walls come in 4 standard sizes, offering different floor to ceiling height options.

Floor blocks

The 250 series offers larger spans due to the increased structural strength from the deeper blocks.

Roof blocks

Your block size will match the floor block span. For example, the M floor block will align with the M roof block.


Skylark stair blocks can be inserted more or less anywhere into the chassis.

Stair voids

By definition, stairs can generally only align with the direction of the floor blocks. You may need to modify floor blocks (i.e. shorten them) to create a void space over your stair. Make sure this opening is supported below by a beam or load-bearing wall.


It will need to be supported by (and fixed-into) a main wall or an internal wall on both sides, although if you wish to have one side of the stair open, this internal wall may not need to extend fully to the ceiling.

Types of stair

You can insert most types of stair, including:

  • Straight
  • L-shaped
  • U-shaped (half-turn)
  • Winders
  • Ladder
  • Spiral

However, if you are using a custom stair design that concentrates a significant load onto a particular part of the floor (for example, the central stem of a spiral staircase), your structural engineer may require that this is given additional support from below.

Building code compliance

Make sure your stair design meets building regulations. This is likely to cover not just the dimensions of the risers and goings, but also head clearance over the stair, the sizing of landings at the top and bottom of the flight, handrails and materials.

Window / Door blocks


Bowties 1 are used as the main connector of parts

Half ties are used around openings

Bowties 2 connect floor blocks to end blocks

Bowtie corner pieces go into internal corners

Wall blocks

All Skylark wall and window/door blocks include a 32mm service zone internally. An internal lining of your choice can then be laid over this for a flush internal surface.

The outer face of the block is smooth and flush.

The block cavity must be completely filled with insulation material - see Insulation for more information.

Floor blocks

All Skylark 250 floor and roof blocks include ⌀130mm holes for ventilation ducts, and access holes in the underside of the blocks to allow you to reach through to install those ducts.

Penetrations through the WH frame can be added to your cutting files so blocks arrive on site coordinated with follow-on trades and M&E / Services strategy, or cut on site.

Roof blocks

There are 2 roof type block styles to choose from - the flat roof and the apex pitched roof.

The flat roof blocks come designed with a 1 or 10 degree fall for drainage purposes

A pitched, apex roof will likely need a ridge beam to support it. The Skylark pitched roof blocks have a housing for the ridge beam to sit within. These roof blocks will then need fixing down into the ridge beam as per a Structural Engineer’s detail.

For a more traditional gable roof form, gable roof blocks are currently available for a medium (4.8m) internal span with a 42 degrees pitch. For assembly purposes, each section of roof is made from two identical parts, which can be temporarily fastened at the apex, and lifted upwards from within the building (see the general assembly guide).

To support the gable roof blocks (and to stop the walls wanting to splay outwards) a ridge beam is required. The standard 200 & 250 series roof blocks allow for a 90mm wide glulam or LVL ridge beam with an 18mm OSB or plywood packer either side. Your structural engineer will need to specify exactly what depth ridge is required depending on the internal span and the weight of the roof. If a larger ridge beam is required, the roof block can be modified to accommodate the larger member.

In some cases, it may be possible to replace a ridge beam with steel ties, but this is likely less architecturally desirable and more complex to install.

It is possible that for your roof span, a different size ridge beam will be required and the standard block can’t accommodate it. In this case, the standard roof block will need editing to fit the ridge beam.

Skylark roof blocks offer a clear service zone internally of 70mm.

Bespoke blocks

It is possible to create bespoke blocks to suit your individual project needs or design ideas. We recommend using our Chassis Design Service for this, or if you would like to make these yourself, we also offer a Chassis Check Service where we can take a look at your design and give any helpful feedback.

If you decide to create your own bespoke blocks, we recommend using the same labelling system and grouping of components as used in the standard blocks. This makes checking and editing the blocks much simpler.

Any new block designs should be checked by your Structural Engineer.

Please do

A tick mark. Means yes, you can do this.

Use it

Most WikiHouse files and information are licensed under a Creative Commons–Sharealike licence, so you are free to use, distribute or modify them, including commercially.

A tick mark. Means yes, you can do this.

Check it

All WikiHouse information is shared 'as is', without warranties or guarantees of any kind. You are responsible for checking it and using it in a safe and responsible way, for example, getting it checked by a structural engineer.

A tick mark. Means yes, you can do this.

Comply with regulations

You are responsible for making sure your project complies with all relevant local regulations, including planning, building codes and health & safety legislation. If in doubt, seek professional advice.

A tick mark. Means yes, you can do this.

Re-share your improvements

If you make any improvements to the system, you must publish your files under the same type of open licence. However, you do not need to publish the plans and specifications for individual projects unless you wish to.

Please do not

A cross. Means no, you can't do this.

Call yourself WikiHouse

Do not call your company, organisation or any marketed product or service 'WikiHouse'. However, you may use the term WikiHouse to talk about the system, and you may describe your project, product, service or organisation as, for example, "using WikiHouse", "based on WikiHouse", "contributing to WikiHouse", or similar.

A cross. Means no, you can't do this.

Remove notices

Do not remove any licence notices from files if you are re-sharing them.

A cross. Means no, you can't do this.

Claim to be endorsed

Do not give the impression that you are endorsed by, or affiliated with WikiHouse or Open Systems Lab (unless you are, by written agreement), and do not claim to represent the WikiHouse project or community as a whole.