Shed Site Preparation Instructions

These are the requirements for preparing a site for your new shed/garage supplied and constructed by Anderson Sheds.  Normal practice is to pour footings and concrete floor as one, prior to construction of the shed.  Ideally all concrete works should be completed a minimum one week prior to commencing construction.

A flat level compact sand pad is required.


  1. Firstly, peg out your site and determine your finished floor level (FFL), as shown by the approved building permit plan.  Remember your FFL is the top of your finished concrete floor, therefore your earthworks finished level is minus whatever thickness concrete floor you are having – generally 100mm.  If no FFL is nominated by the building permit, the top of your sand pad should have a minimum finish level equal to or higher than the highest point of the surrounding ground.  This will keep your FFL a minimum of 100mm above surrounding ground and should eliminate any future flooding issues.

  2. The site must be flat, level and compact.  Basically, a pad consistent with that required to build a house is necessary for your Shed.  The removal of any vegetable material or rubble is first required before adding a top layer of clean yellow sand (minimum of 50 to 100mm thickness). A variation of no more than 10mm in the final sand pad height, over the entire slab area is acceptable. 

  3. In most cases, a compaction certificate is not required but normally a plate compactor would be required to have been used to achieve the required compaction for final preparation.

  4. The pad should ideally be 1.0m larger all around than the size of the shed (in other words a 10.0m x 12.0m shed will require a 12.0m x 14.0m pad). 

  5. The site must be free of obstructions (e.g. overhanging branches, clothes line, fences) and have reasonable access. Suitable access to back a concrete truck onto the site is required – on some properties this may require laying a suitable limestone driveway or similar. Where concrete truck access is limited a concrete pump may be required and can result in extra costs.

  6. The ground must be easily penetrable to a minimum depth of 650mm for footings.  No allowance has been made for hard digging and if encountered extra charges may apply.

  7. Power and water must be available.  If not, this must be stated so other arrangements can be made.

  8. Unless other arrangements have been made, it is the responsibility of the customer to supply a flat level compact sand pad.  If the concreters arrive on site and work is unable to proceed due to any of the above requirements not being met, a minimum $400 call out fee will apply.


Our experience has shown that if the earthmoving contractor does not use a laser level or similar instrument their work is generally substandard.


It must be remembered the key to good concrete is good preparation. Should you have any queries, or require a site visit, please don’t hesitate to contact our office.

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