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CommercialExtension drawings

Extending and reconfiguring commercial premises

Businesses extend too. Whether you are adding floor area to a retail unit, office or workshop, we produce council-ready drawings built around how the space is used.

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Any application refused? 100% refund within 5 days.We are confident in our work, so we stand behind it. Refund terms.

What's includedClear scope

Everything your project needs

In plain English: the drawings you submit for approval, and the same set your contractor prices and builds from.

Commercial extension types

Commercial and retail unit extensions
Mezzanine floors and additional floor area
Warehouse, workshop and industrial extensions
Office and studio extensions
Rear, side and infill extensions to premises

Structure & frontage

Structural openings and steel frames
Shopfront alterations and new openings
Existing and proposed plans, elevations and sections

Existing and proposed extension drawings — Existing and proposed sheets from a real rear extension set.

Not sure which applies to you?

Send your postcode and what you are planning. You get the route, the drawings you need and a fixed price in writing, usually the same working day.

Get my drawings quoted →See how pricing works

Free guideInstant download

Get a free personalised plan for your project

Tell us the property and what you want to build. We confirm your planning route, the drawings you need and a fixed price in writing, at no cost. Prefer to read first? Take the free extension guide below.

Get a personalised route check →Download the free guide (PDF)or Word version

Guide plus a personalised route check

Send your details and we will email the guide plus a route check for your own property. No spam.

Real examplesOur actual drawings

Projects like yours

Extensions

Rear extension, semi-detached

View case study

Extensions

Rear extension, A1 sheet set

View case study

See all projects

Common questionscommercial extensions

Quick answers

Do commercial extensions need full planning permission?

Usually yes, though some works to premises fall under permitted development or prior approval depending on use class and location. You get the route confirmed in writing before any design work starts.

How long will it hold up my opening?

A council decision typically takes 8 weeks from validation, with drawings before that. Tell us your target opening date and we will tell you honestly whether it is realistic and what route gets you there fastest.

What does it cost?

One fixed written price, quoted after a free route check, covering the drawings and the application. The council fee and any structural engineer are separate and flagged up front.

Why Exp|Arc for a commercial project?

Fixed scope and price rather than hourly billing, unlimited revisions, the council handled for you, and a 100% refund if any application we submit is refused.

Still not sure where you stand?Send a few details and we will confirm your route and price in writing, with no obligation.Get my drawings quoted

Start nowFree route check

Tell us about your premises

Send a few details and we will confirm the right route and the drawings you need, with a fixed package price. We aim to complete your drawings within 10 working days.