Home › Guides › Insights

Insights from the Drawing Board.

Practical notes from Charles Tynan and the TM Architectural Designs team on planning routes, local authority behaviour, what a complete drawing package contains, and what the delay in a slow drawing stage actually costs.

Planning Local Authorities Drawings For Builders Client Story

Planning

Most loft conversions in England don’t need planning permission

Direct answer

If a loft conversion stays within Permitted Development rights — which the majority do — the planning application stage is skipped entirely. The route becomes a Lawful Development Certificate plus Building Regulations approval, which is faster and carries less risk than waiting on a planning decision.

A lot of homeowners don't realise this until they've already lost weeks worrying about the wrong thing. They assume a full planning application is unavoidable, budget for the delay, and put the project back by a month or more before anyone checks whether it was ever required.

It is worth establishing which route applies before you assume you need full planning permission. The distinction changes both your timeline and your paperwork:

Two routes to a compliant loft conversion
	Permitted development route	Full planning route
What you apply for	Lawful Development Certificate	Householder planning application
Planning committee involved	No	Potentially
Building Regulations still required	Yes	Yes
Relative risk	Lower — criteria are objective	Higher — subject to judgement
Typical trigger	Within volume and roofline limits	Mansard, or roofline substantially altered

Rights are reduced or removed in conservation areas, on listed buildings, and where an Article 4 direction applies — so the check has to be made against your specific address. Our full guide covers this in detail: Do I need planning permission?

Local Authorities

What we’ve learnt processing planning applications across UK councils

Direct answer

Not all local authorities operate the same way, and treating them as though they do is one of the most common and costly mistakes we see. Determination times, design guidance and documentation requirements all vary by authority, and knowing the differences upfront is a large part of why 98% of our applications pass first time.

Four differences matter more than any others:

Where local authorities diverge
Variable	What we see in practice	Why it matters
Determination times	Some authorities validate and determine in 6–7 weeks; others routinely run to 10–12	Realistic programming for you and your builder
Design guidance	What is compliant in one borough is flagged in another — pitched roof requirements, material matching, extension proportions	Drawings must answer the receiving authority's expectations
Conservation areas	Heritage Statements and fuller design justification are required	Submitting without them triggers automatic requests for further information, adding weeks
Pre-application advice	Some authorities offer it free, others charge	On complex schemes the intelligence can be invaluable

We carry that knowledge into every project rather than submitting a generic drawing set and hoping. It is the difference between an application that is validated first time and one that stalls at the front desk.

Drawings

What does “council-ready” actually mean?

Direct answer

A council-ready package is a complete planning submission: site location plan, block plan, existing and proposed floor plans, and existing and proposed elevations, all drawn to correct scale and correctly labelled. Some applications also require a Design and Access Statement depending on the authority and project type.

Most homeowners hand over money for architectural drawings without knowing what they are supposed to be getting. Here is the full checklist:

What a complete planning submission contains
Drawing	What it shows
Site Location Plan	An OS-based map showing the property in context, with the application site edged in red
Block Plan	A larger-scale plan showing the property boundary and the position of the proposed works within it
Existing Floor Plans	Accurate drawings of the property as it currently stands
Proposed Floor Plans	The extension or conversion as designed
Existing & Proposed Elevations	Scaled drawings of each affected external face of the building
Design and Access Statement	Required for some applications, depending on authority and project type

All of it has to be drawn to the correct scale, correctly labelled, and packaged into a single complete submission. That is what we deliver — as a PDF, within two weeks, ready to submit the moment it lands in your inbox. No chasing for missing documents, no last-minute additions.

For Builders

Every week you wait on drawings is a week your crew isn’t billing

Direct answer

A two-person crew costs conservatively £1,500–£2,000 per week in wages alone. If a drawing set takes 12 weeks instead of two, that is ten weeks of potential project time lost — and across two or three projects a year the cumulative cost stops being an inconvenience and becomes a structural drag on the business.

Put a number on it and the maths is uncomfortable:

The cost of a slow drawing stage
	12-week drawing stage	2-week drawing stage
Weeks before work can start	12	2
Idle crew weeks	10	0
Indicative wage cost of the delay	£15,000–£20,000	—
Effect across 2–3 projects a year	Compounding	Negligible

Figures are indicative and based on wages alone; tools, equipment and overhead sit on top. We work with contractors specifically to remove that variable: a fixed two-week turnaround, council-ready drawings delivered as a PDF, and no surprises on timeline or cost. Your crew stays busy, your clients stay happy, and your cash flow stays intact.

Client Story

Quoted £4,800 and 14 weeks. Delivered in 12 days for less.

Direct answer

A homeowner planning a kitchen extension had been quoted £4,800 and a 14-week timeline by an architect, with two further site visits and multiple revision rounds. She came to TM Designs instead, received a complete set of council-ready drawings in 12 days for less, and the application was approved with her builder on site the following month.

She had already had the initial consultation. The quote came back higher than expected, the timeline longer than she had hoped, and the process — two more site visits, multiple revision rounds — felt like more disruption than she was prepared for.

She found TM Designs, completed the enquiry form, and decided to give us a try. Twelve days later she had a complete set of council-ready drawings in her inbox as a PDF: floor plans, elevations, site location plan, everything required for a full planning submission.

Application submitted. Approved. Builder on site the following month. The cost saving paid for a significant chunk of the build itself — and the process didn't require a single day off work, or a single person in her home.

This is what we built TM Designs to do.

Start your project

Fixed fees from £550, council-ready drawings in two weeks, delivered as a PDF. Tell us what you're planning and we'll confirm the route, the fee and the delivery date.

Request a quotation →