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From $3,490, scope reviewed first

Room Extension Plans

Documentation for single room and straightforward residential additions. Practical, approval ready plans for homeowners who want more space without an open ended design process.

About this service

A practical path to more space.

Plan Draft's room extension service is built for straightforward single room additions where the scope is clear and the goal is practical approval ready documentation. Plans start from $3,490, with the price confirmed in writing after a scope review and before any work begins.

  • Typical turnaround: 15–20 business days
  • Price confirmed in writing before work starts
  • Digital PDF set, ready for certifier lodgement

From, scope reviewed first

$3,490+

Price confirmed in writing before work starts. No commitment required to enquire.

We review your scope before confirming a price. If your project isn't suited to this service, we'll tell you honestly, before you commit to anything.

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Scope of service

What's included, and what's not.

The price covers the drawing set required for a standard single room addition approval application. The following clarifies what sits inside and outside the scope.

Included in the price

  • Site plan showing addition location on property
  • Existing and proposed floor plans
  • Roof plan
  • All required elevations and sections
  • Basic specification and materials schedule
  • One round of drawing revisions
  • Digital issue (PDF) suitable for building approval

Not included in the price

  • Council application and lodgement fees
  • Structural engineering
  • Site survey or title re establishment
  • Multi storey additions or dual occupancy
  • Heritage or overlay specific reports
  • Revisions beyond the included round
Room Extension FAQs

Common questions about room extension plans.

What types of room extensions does Plan Draft handle?
Plan Draft handles single room additions to existing dwellings, bedroom extensions, living area additions, study or home office additions, and similar straightforward projects. We are not suited to multi storey additions, dual occupancy, large scale renovations, or projects involving significant structural alteration to the existing dwelling.
Why does this service start from a price rather than a fixed price?
Room extensions vary more in scope than carports, decks, or patios. The starting price of $3,490 reflects a simple, well defined project. Once we review your specific scope, we confirm a fixed price in writing before any work begins, so you still get certainty, just after a brief review rather than upfront.
What does the scope review involve?
We ask you to send your project address, a description of what you want to add, any existing plans, and site photographs. We review the information and respond within one business day with either a confirmed fixed price in writing, or an explanation of why the project doesn't suit our process. No cost, no commitment required to get this assessment.
Do I need existing house plans to get started?
Existing house plans are helpful and often necessary for room extension work, as we need to understand the existing structure the addition is connecting to. If you don't have them, let us know, council archives sometimes hold older records, and in some cases we can work from a measured site visit.
Does the price include structural engineering?
No, structural engineering is not included in the drawing fee. Whether engineering is required depends on your project and your building certifier's requirements. Many straightforward single room additions require some engineering documentation. We'll give you an honest indication of what to expect during the scope review.
How long does a room extension approval take?
After drawings are complete, a private building certifier typically takes 10–20 business days to assess a straightforward single room addition. Council applications take longer. Having complete, accurate drawings from the outset significantly reduces the risk of delays from requests for additional information.
Interested?

Send us your project details.

We'll review suitability, confirm the price in writing, and get back to you within one business day. No obligation.

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