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Terms & Conditions


These Terms and Conditions shall be governed by and construed in accordance with English law. Disputes arising in connection with these Terms and Conditions shall be subject to the exclusive jurisdiction of the English courts.

If any provisions hereof are held to be illegal or unenforceable such provisions shall be severed and the remainder of this Agreement shall remain in full force and effect unless the business purpose of this Agreement is substantially frustrated thereby.


These drawings and documents are licensed for use by ONLY the Client named and must ONLY be used at the property address stated. If these drawings/documents are illegally shared with others, the Professional Indemnity Insurance that covers the design will be rendered invalid and you may be placing yourself in a position of serious financial risk.

The copyright of this specification and the associated drawings is held by Instant Plans Ltd (T/A Instaplans) and no reproduction is allowed.

The associated drawings must be checked and measurements taken on site prior to work commencing. All dimensions are in millimetres unless otherwise stated. DO NOT SCALE.


As Client, you shall be responsible for issuing all notices to any adjacent property owners as may be deemed necessary by the Party Wall Act 1996.

Please refer to the following link for more information in general about the Party Wall Act (most applicable guidance for new extensions striding the property boundary is from page 17 onwards).


The Client shall be responsible for the appointment of a PARTY WALL SURVEYOR should their services be required.

CDM 2015

Under the Construction Design Management (CDM) Regulations 2015, the owner of the property has Domestic Client responsibilities.

For more information, please read the following link (www.hse.gov.uk/ construction/cdm/2015/domestic-clients.htm).

Typically, the Contractor may undertake the Domestic Client’s Health and Safety responsibilities in addition to their own as Contractor, however, for certainty please ask that they confirm this to you in writing.

Instant Plans Ltd do not act as Principal Designer under the CDM regulations and if this service is required please seek the appointment of a third party architect.


 For the avoidance of doubt, whether or not indicated on the drawings all workmanship and materials shall comply with current Building Regulations, British Standards, Codes of Practice and LABC.

All materials shall be fixed, applied or mixed in accordance with all selected Manufacturers’ Instructions or Specifications.  All materials shall be suitable for their purpose. The Contractor shall take into account everything necessary for the proper execution of the works, to the satisfaction of the ‘Building Inspector’ whether or not indicated on the drawing.

All information must be read in conjunction with third party consultant/specialists documents and drawings (such as structural engineer, site investigation engineer, etc.)


If the Client/Contractor/Consultant requires ANY changes to the downloaded designs as they are supplied, then this additional service will be quoted directly to the Client.

Our quotes for additional services are based on a rate of £45/hour and all quotes must be agreed in writing prior to the changes being implemented.

Instant Plans Ltd reserve the right to refuse changes at our own discretion that we deem are in breach of civil or statutory law and/or health & safety, etc.


Any discrepancy shall be immediately reported and resolved prior to work commencing.


The ‘Approved Documents’ refer solely to properties in England.

The Building Regulations Approved Documents are live documents which are periodically updated by HM government. As such, we may also need to revise our documentation to reflect changes. If a long period of time passes between downloading our designs and building work commencing, then the Regulations referred to may be become outdated. ALWAYScheck prior to Building Regulation submission that the documents provided by Instant Plans Ltd are current; please contact us for assistance if required.

The most current versions of the Building Regulations are stored here:


The versions that these Construction Notes are based on are as follows:

  • Approved Document A – Structure (2004 Edition incorporating 2004, 2010 and 2013 amendments)
  • Approved Document B (Fire safety) – Volume 1: Dwellinghouses (2006 edition incorporating 2010 and 2013 amendments)
  • Approved Document C – Site preparation and resistance to contaminates and moisture (2004 Edition incorporating 2010 and 2013 amendments)
  • Approved Document D – Toxic Substances (1992 edition incorporating 2002, 2010 and 2013 amendments)
  • Approved Document E – Resistance to the passage of sound (2003 Edition incorporating 2004, 2010, 2013 and 2015 amendments)
  • Approved Document G – Sanitation, hot water safety and water efficiency (2015 edition with 2016 amendments)
  • Approved Document H – Drainage and Waste Disposal (2015 edition)
  • Approved Document J – Combustion appliances and Fuel Storage systems (2010 edition incorporating 2010 and 2013 amendments)
  • Approved Document K – Protection from falling, collision and impact
  • Approved Document L1A: Conservation of fuel and power in new dwellings (2013 edition with 2016 amendments)
  • Approved Document M – Access to and use of buildings: Volume 1 – Dwellings (2015 edition incorporating 2016 amendments)
  • Approved Document P: Electrical safety – Dwellings (2013 edition)
  • Approved Document Q: Security – Dwellings (2015 Edition)
  • Approved Document R– Physical infrastructure for high speed electronic communications networks
  • Approved Document 7 – Materials and workmanship


Do not commence construction until the Building Control Officer confirms that you may start. Typically, this is at least 48 hours after a Building Notice has been submitted and acknowledged by the Building Control Officer.

Please note that a ‘Full Plans’ submission must be made when building over drains that appear on the ‘map of sewers’. The ‘Full Plans’ application typically takes been 5-8 weeks to receive a decision.


Downloaded drawings/documents from Instant Plans Ltd rely on correct information to be inputted by Clients in the Qualification stage.

Please note that incorrectly inputted answers in the Qualification stage may result in you constructing an illegal house extension. The result of which could be demolition by Local Authority enforcement at a Client’s expense including legal fees.

Instant Plans Ltd do not accept any responsibility for incorrectly entered information by the Client and reserve the right to charge additional fees for the release of additional drawings to rectify a Client’s error.


Instant Plans Ltd carry Professional Indemnity Insurance which covers professional services in accordance with the requirements of the ARB (Architects Registration Board) and the limit of liability for any one claim will be capped at £250,000.


Instant Plans Ltdowns all the intellectual property rights relating to the site, including the designs, text, database, graphics and layouts, and you agree not to use or copy any part thereof without our express permission.


Instant Plans Ltd reserves the right to change or update these terms and conditions from time to time. As a User of the website, you are responsible for acknowledging any updates of these terms and conditions by visiting this section. Any significant changes in the terms and conditions will be followed by notification emails to all active Users.