Is It Worth Getting an Architect for an Extension?

“Building without a plan is like navigating without a compass—you might get somewhere, but not where you intended.” If you're planning a home extension, you've likely asked yourself if hiring architects for extensions is worth the extra cost.

At Zidouri Architecture, we’ve helped homeowners in Nottingham navigate this very question since 2019, delivering successful projects ranging from single-storey kitchen extensions to extensive loft conversions and renovations.

So, is an architect necessary, or can you manage without one? Let's dive in.

What Does an Architect Actually Do for a House Extension?

Many assume an architect only draws plans. In reality, architects for extensions handle much more than just creating beautiful designs—they manage your project from start to finish.

Turning your ideas into real designs

An architect translates your vision into practical, attractive, and functional extension architecture. By listening carefully, they ensure your extension matches your lifestyle and your home's aesthetics.

Managing planning and approvals

Architects handle the complex paperwork involved in planning applications. At Zidouri Architecture, we include full liaison with local councils as part of our fixed-price service (£950 including VAT for single-storey rear extensions).

Overseeing construction and quality

Architects don’t just stop at drawings. They ensure your project meets quality expectations, managing any construction issues that arise.

Ensuring compliance with building regulations

Architectural drawings for extension projects must comply strictly with UK building regulations. Your architect ensures your extension won’t face expensive issues later.

Planning application support

This includes preparing documentation, submitting it, and managing council feedback.

Building Regs documentation

Detailed plans and technical drawings that satisfy building control requirements.

Tendering and selecting builders

Architects for extensions can secure competitive quotes from trusted local builders.

Site inspections and contract administration

Regular site visits help catch potential issues early, saving time and money.

How Much Does an Architect Cost for an Extension?

Architect costs vary based on your project's specifics. Let's break it down clearly.

Typical pricing models (percentage vs fixed fee)

Architect fees often range between 5% to 15% of your construction budget or can be offered at a fixed rate. At Zidouri Architecture, we prefer a transparent fixed-fee model. Here’s what you can expect:

Single-storey extension: £950 including VAT
Double-storey extension: £1,450 including VAT
Loft conversion with dormer: £950 including VAT

Factors that influence the cost

Size and complexity of the extension

Larger, more complex projects naturally attract higher fees.

Level of involvement required

Do you need basic plans, or full project management? This influences extension architect fees.

Location and experience of the architect

Hiring local architects for house extensions, like our team based in Nottingham City Centre, typically ensures better familiarity with local planning rules and processes.

Is an architect worth the investment financially?

Absolutely. An architect can significantly reduce costly mistakes and delays, potentially saving you money overall.

How Much Does It Cost to Get Plans Drawn Up for an Extension?

Plans can range significantly in cost, depending on detail and purpose.

Initial sketches vs full architectural drawings

Basic sketches are cheaper, but detailed architectural drawings are essential for planning approval and construction.

Planning drawings vs building regs drawings

Planning drawings show overall appearance, while building regs drawings include technical specifications required by the authorities.

When do you need structural calculations?

Structural calculations are necessary for extensions involving load-bearing walls. Zidouri Architecture handles structural calculations in-house, simplifying the process.

Hidden costs to watch out for

Watch for council fees, structural engineer fees, and building control inspections. We clearly outline these upfront so there are no surprises.

Can You Build an Extension Without an Architect?

Technically yes—but there are significant risks.

When it might be possible (and legal)

Smaller extensions under permitted development may not need formal architectural input.

Risks of going without professional input

Without an architect, homeowners risk violating regulations, choosing unsuitable materials, or encountering unexpected structural issues—leading to significant extra costs.

Alternatives: Design & build companies or technicians

While cheaper upfront, these alternatives might lack the depth of planning and design expertise provided by professional architects for extensions.

Case study: Homeowner-led extension projects

Some homeowners succeed with DIY projects but often underestimate the complexity involved.

When a builder takes the lead – pros & cons

While builders are experts at construction, they usually don’t provide detailed design or handle planning paperwork, potentially causing headaches later.

How to Find an Architect for an Extension?

Selecting the right professional makes a big difference.

Where to start your search

RIBA directory

This professional body lists fully qualified architects.

Local recommendations

Ask neighbours who’ve completed extensions.

Online matching services

Sites like Design for Me simplify the selection process.

What to ask before hiring

Can you show previous projects similar to mine?
What's included in your fees?
How often will you inspect the site?

How to check an architect’s previous extension projects

Always review an architect’s portfolio. For example, at Zidouri Architecture, we've completed notable local projects such as:

Connery Mews, Toton (double-storey and single-storey extensions) - Take a look at some of our extension architecture in Nottingham case studies by clicking the link.
Fourth Avenue, Carlton (single-storey extension, loft conversion, and full renovation).

Choosing a service level that suits your budget

Transparent pricing is vital—be clear about your budget to ensure you receive appropriate architectural support.

What Are the Stages of Working with an Architect for an Extension

Projects typically progress through these clear stages:

Stage 1 – Planning and Concept Design

Establish your vision and obtain necessary planning permissions. Our architectural designers will handle the full process whether from using the Planning Portal on your behalf, to requesting permissions.

Stage 2 – Technical Design and Approval

Detailed designs, structural calculations, and obtaining building regulations approval.

Stage 3 – Tendering and Contractor Selection

Selecting trusted builders through competitive quotes.

Stage 4 – Construction and Site Inspections

Monitoring progress, quality control, and resolving unexpected issues.

How often should your architect visit the site?

For most extensions, architects visit weekly or fortnightly.

What happens if issues arise during construction?

Your architect manages these promptly, ensuring minimal disruption.

FAQs About Architects for Extensions

Do I legally need an architect for my extension?No, but using one reduces significant risks and potential hidden costs.

How much does an architect charge for extension plans?At Zidouri Architecture, our fees for single-storey extensions start from £950 including VAT.

Can an architect save me money?Yes. Architects help avoid costly errors, negotiate builder fees, and ensure efficient design.

What's the difference between planning drawings and building regulation drawings?Planning drawings outline your extension's appearance; building regulation drawings detail technical specifications for safe construction.

Final Thoughts

Hiring architects for extensions is a wise investment. They provide peace of mind, professional expertise, and ultimately, save you stress, time, and money.

Considering a home extension? Let's chat! At Zidouri Architecture in Nottingham, we're passionate about bringing your vision to life. We're always up to date with the latest regulations by subcribing to sites such as HOA Whether it's a small extension or a larger transformation, we’re ready to help you create your dream home.

Ready to discuss your project? Get in touch with us today! Or for more info on cost - why not read our other blogs on Extension Architecture?