Architectural drawings and a fee schedule on a London drafting desk, illustrating what drawing packages cost

Guide

How Much Do Architectural Drawings Cost in London? (2026)

What architectural and planning drawings actually cost in London in 2026 — fixed fees by project type, the three package tiers, and why drawing fees are not build costs.

Key Takeaways

Drawing fees in London scale with the project, not the postcode: simple deliverables such as floor plans or a measured survey start around £450, most house extension and loft packages sit around £1,100–£1,600, and the largest schemes — wraparounds, double-storey extensions, basements and new builds — run from about £2,200 to £2,500 upward.
Most projects follow one of three package tiers — a permitted-development pack (roughly £950–£1,450), a full planning pack (roughly £1,600–£2,400), and a combined planning-and-building-regulations pack (roughly £2,200–£3,850) — with the price set by how much structural and detailing work the scheme needs.
Drawing fees are not construction costs: these figures buy the design and the drawings a council accepts, not the building work — always get a separate builder quote for the physical construction.

The first question almost every London homeowner asks is what the drawings will cost, and the honest answer is that it depends far less on where you live than on what you are building. A set of floor plans is a different job from a full planning-and-building-regulations package for a double-storey extension, and the fee reflects the design time, the structural input and the number of approvals involved. This guide sets out real 2026 drawing fees for London projects by type, explains the three package tiers most schemes fall into, and draws the important line between drawing fees and the cost of actually building.

Every fee here is a genuine fixed-fee starting point, not a percentage of your build cost and not an estimate that creeps. We confirm the exact package and price for your specific project — and check whether it is even needed — before any work begins, free.

What drives the cost of architectural drawings

Drawing fees are driven by the complexity of the design, not the value of the property. Three things move the price. First, the size and type of project — a single set of floor plans is a fraction of the work of a full extension package. Second, how many approvals the scheme needs — permitted-development evidence, a full planning application, and building-regulations detailing are increasingly involved layers. Third, the amount of structural and technical design required — a mansard or a basement needs far more calculation and detailing than a simple rear addition. Location affects the planning strategy, but a loft in one borough and a loft in another cost the same to draw.

Project size and type — a survey or floor plan versus a full extension package
Number of approvals — permitted development, planning, building regulations
Structural and technical detailing required — beams, foundations, Part L
Fixed fee agreed upfront, not a percentage of the build cost

Drawing fees by project type in London (2026)

The clearest way to understand cost is by deliverable. The simplest jobs — a set of floor plans or a measured building survey — start around £450, and standalone structural drawings from about £650. A garden room starts around £750. The core householder projects cluster in a predictable band: planning drawings, a lawful development certificate and most straightforward lofts, dormers, rear extensions and garage conversions start around £950–£1,300, with architectural drawings and change-of-use work from around £1,200. More involved schemes rise from there: side-return extensions, building-regulations packages and HMO conversions from around £1,400, mansards and flat conversions from £1,600, and the largest projects — wraparounds from £2,200, double-storey extensions and basements from £2,400, and new builds from £2,500. Each is a fixed starting fee for the drawing package, confirmed once we have seen the property.

Floor plans / measured survey — from around £450
Structural drawings — from around £650; garden room — from around £750
Planning drawings, LDC, most lofts and rear extensions — from around £950–£1,300
Side-return, building regs, HMO — from around £1,400; mansard and flat conversion — from around £1,600
Wraparound — from around £2,200; double-storey and basement — from around £2,400; new build — from around £2,500

The three package tiers explained

Most projects are quoted as one of three packages, and understanding them makes the fees make sense. A permitted-development pack — roughly £950 to £1,450 — covers the drawings and the lawful development certificate submission for work that does not need planning permission, and is the fastest route at around seven to ten working days. A full planning pack — roughly £1,600 to £2,400 — adds the design-and-access material and council liaison for a full planning application, usually ten to fourteen working days. A combined planning-and-building-regulations pack — roughly £2,200 to £3,850 — includes the structural calculations and construction detailing needed to actually build, typically fourteen to twenty-one working days. The right tier depends on whether the project is permitted development, needs planning, and how much building-regs detailing it requires.

Drawing fees versus the cost of building

The single most important thing to understand about any drawing fee is what it does and does not buy. The fees on this page pay for the design and the technical drawings a council will accept — the deliverable that gets your project approved. They are not the cost of the physical building work, which is a separate and much larger figure paid to a builder or contractor and priced per square metre of construction. We deliberately do not quote build costs, because they vary enormously with specification, ground conditions and contractor, and only a builder pricing your actual drawings can give a reliable figure. The correct sequence is drawings first, then competitive builder quotes against those drawings.

Drawing fees buy the design and council-ready drawings
Build costs are separate, larger, and quoted by a builder per project
A fixed drawing fee lets builders quote like-for-like against the same plans
We do not estimate construction costs — a builder prices the finished drawings

How do I get an accurate price for my project?

Because the fee depends on the project rather than the postcode, an accurate quote needs only a short conversation about what you want to build and a look at the property. From that we confirm which package applies — permitted development, full planning, or planning plus building regulations — and give a fixed fee for the whole drawing set, with free redraws to approval. There are no percentage-of-build fees and no hourly creep. The starting figures on this page are reliable anchors; the final fixed fee is confirmed upfront, before any work begins, so there are no surprises once the project is underway.

Why is a fixed fee better than a percentage of build cost?

Two pricing models dominate architectural and drawing work: a fixed fee agreed up front, and a percentage of the eventual construction cost. For most London homeowners a fixed fee is the more honest and predictable of the two, because it ties the price to the work actually done — designing and drawing the scheme — rather than to a build figure that has nothing to do with the drafting effort and only grows as your specification does. A percentage arrangement quietly penalises you for choosing better finishes and leaves the fee uncertain until the build is priced, which is precisely when homeowners least want a moving target.

What a fixed fee protects you from

A fixed fee is agreed before any work starts and does not move with the build cost, so upgrading from a standard kitchen extension to a high-specification one does not inflate the drawing bill. It also removes hourly creep — there is no meter running on revisions — which matters most during planning, where a scheme can go through several iterations. Because the fee is known, you can budget the design stage precisely and keep it entirely separate from the far larger, and more variable, cost of construction that a builder will quote later.

Free redraws to approval and what they mean for cost

The other half of predictable pricing is what happens if the council asks for changes. Where redraws to approval are included, amendments requested by the planning officer are made without a further charge, so a fee quoted at the outset is the fee you pay even if the scheme needs revising to secure consent. That turns the drawing package into a genuinely fixed cost for getting approved, rather than a starting figure that grows every time the council comes back — which is the outcome homeowners most often fear when they ask what drawings will cost.

Architectural drawings and a fixed-fee schedule on a London drafting desk, showing how drawing packages are priced by project rather than by build cost

Indicative London drawing fees by project type (2026, fixed starting fees)
Project	Typical package	From
Floor plans / measured survey	Standalone drawings	£450
Structural drawings	Standalone calculations	£650
Garden room	Permitted development / LDC	£750
Planning drawings / LDC	Permitted development	£950
Loft, rear extension, garage conversion	PD or householder planning	£1,100
Architectural drawings / change of use	Planning package	£1,200
Building regs / side-return / HMO	Planning + building regs	£1,400
Mansard / flat conversion	Full planning + structural	£1,600
Wraparound extension	Full package + structural	£2,200
Double-storey / basement	Full package + structural	£2,400
New build	Full design package	£2,500

FAQ

Frequently asked questions

How much do architectural drawings cost in London?+

It depends on the project, not the location. Simple deliverables such as floor plans or a measured survey start around £450, most house extension and loft packages sit around £1,100 to £1,600, and the largest schemes — wraparounds, double-storey extensions, basements and new builds — start from about £2,200 to £2,500. Every fee is a fixed starting price for the drawing package, confirmed once we have seen the property.

Why do drawing fees vary so much between projects?+

Because the design work varies. A single set of floor plans is a small job, while a full package for a double-storey extension involves planning strategy, structural calculations and building-regulations detailing. The three drivers are the size and type of project, how many approvals it needs — permitted development, planning, building regulations — and how much structural and technical detailing is required. Location barely affects the drawing fee itself.

Do architectural drawing fees include the cost of building work?+

No. Drawing fees pay for the design and the council-ready drawings, not the physical construction. Build costs are a separate and much larger figure, paid to a builder and priced per project against your specific specification, ground conditions and finish. We do not estimate construction costs — the correct sequence is to get the drawings done first, then obtain competitive builder quotes against those drawings.

What are the different drawing packages and their prices?+

Most projects fall into one of three tiers. A permitted-development pack, roughly £950 to £1,450, covers drawings and a lawful development certificate for work that does not need planning permission. A full planning pack, roughly £1,600 to £2,400, adds the material for a full planning application. A combined planning-and-building-regulations pack, roughly £2,200 to £3,850, includes the structural calculations and detailing needed to build. The right tier depends on your project.

Is a fixed fee better than paying a percentage of the build cost?+

For most London homeowners, yes. A fixed fee ties the price to the design and drawing work actually done, so it does not rise just because you choose better finishes or the build cost grows. A percentage arrangement leaves the fee uncertain until the construction is priced and effectively penalises a higher specification. A fixed fee, agreed up front and ideally with redraws to approval included, keeps the design cost predictable and cleanly separate from the larger, more variable cost of building.

Do drawing fees include revisions if the council asks for changes?+

With a fixed-fee package that includes free redraws to approval, amendments the planning officer requests are made without a further charge, so the fee quoted at the outset is the fee you pay even if the scheme has to be revised to win consent. That is different from an hourly arrangement, where every iteration adds to the bill. It is worth confirming that redraws to approval are included, because it is what turns a starting figure into a genuinely fixed cost for getting approved.

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