Do you need an Architect for a Loft Conversion?

Our in-house team handles it all

do you need an architect when choosing

A Charles Grosvenor Loft Conversion?

June 30, 2026

For most loft conversions, the answer is no – and if you choose a specialist design-and-build company like Charles Grosvenor, the question largely takes care of itself.

On a project managed by a separate architect, you appoint the architect, the architect produces drawings, a structural engineer checks the calculations, and a building contractor carries out the work. The only link between all of them is you – the customer.

With Charles Grosvenor, every one of those functions sits within our in-house team. You don’t need to source or appoint an architect separately, because the design and technical work is already part of what we do.

How our in-house team handles your loft conversion from start to finish

When homeowners ask whether they need an architect, they are usually asking a subtler question: who makes sure this is designed properly and approved by the right people?

On a Charles Grosvenor project, our in-house team handles:

Initial survey and feasibility: A site visit to assess your roof space, structural constraints and the realistic scope of what can be achieved. This shapes everything that follows and prevents costly surprises during construction.

Design drawings: Full loft layout drawings produced by our design team, developed around how you want to use the new space in your home.

Planning applications: Where planning permission is needed, we prepare and submit the application on your behalf, including any supporting documentation required by your local authority.

Structural calculations: Completed by our structural engineers to satisfy Building Regulations and confirm the design is safe to build as drawn.

Building Regulations approval: We manage the submission and inspections required to gain sign-off at each stage of construction.

Construction and project management: Our own build teams carry out the work, managed by a dedicated project coordinator from concept to handover.

Our process means all the co-ordination is handled by us – the people who drew the design are the same people checking it can be built, and our team will be managing including construction, so there is no gap for miscommunication, no redesign when a builder points out the drawings don’t work on site, and no confusion about who is responsible when something needs resolving.

Planning Permission: What you need to know before work starts

Planning permission for loft conversions is one of the most misunderstood parts of the process, and it is worth understanding the basics before you speak to anyone.

Most loft conversions in England fall within permitted development rights, which means they can go ahead having applied for permitted development.

The rules cover things like the maximum volume of the extension, roof height limits, and the materials used on the exterior. If your project sits within those parameters, construction can begin once Building Regulations approval is in place.

We have a complete guide to planning permission for loft conversions, which you can read here.

What our design-and-build contract means for you

The term “design and build” is used widely in construction, so it’s worth being specific about what it means in practice with Charles Grosvenor.

One contract, not three. You sign a single agreement with Charles Grosvenor covering design, planning and construction. There is no separate architect’s appointment, no separate structural engineering commission, no separate building contract. If something changes during the project – a planning condition, a structural requirement, a design revision – it is resolved by us, not negotiated across multiple parties.

A fixed price before work starts. Your Charles Grosvenor quote is a fixed-price contract. The figure you agree before construction begins is the figure you pay, subject only to changes you instruct. Loft conversions managed by separate architects and contractors often experience cost variations at the build stage because the person who drew the design is not the one accountable for delivering it within budget. When all approvals are in, and a start date is given, if the date is delayed at the customer’s request, the fixed price will not be valid.

A single point of contact throughout. You will have a named Project Manager who will look after you from the pre-start chat through to completion of your loft conversion project.

No redesign risk. Because our design team works directly with our construction teams, the drawings produced are drawings that can be built. Plans that look right on paper but require expensive modification on site (a common source of cost overrun in separately contracted projects) are identified and resolved before your build starts with a meeting with your Project Manager.

How much does using a separate Architect add to the cost of a loft?

When homeowners manage the process independently – sourcing an architect separately – architect fees alone typically represent 5–12% of the total build cost.

On a £45,000 project, that is £2,250–£5,400 in professional fees before a single piece of timber is cut. With Charles Grosvenor, those costs are absorbed within your fixed-price contract.

To get an accurate figure for your property, the starting point is a free home survey. Costs can vary according to your location, roof space, and the type of conversion that best suits your home; what we can tell you after a site visit is what your specific space can realistically achieve and what it will cost.

FAQs: Do you need an architect?

Do I legally need an architect for a loft conversion?

No. There is no legal requirement to appoint a qualified architect for a residential loft conversion in England. The legal requirement is that the structural work complies with UK Building Regulations and that any necessary planning permissions are obtained. Both can be managed by a regulated design-and-build company.

You can read all our FAQs with questions and answers here.

What is the difference between an architect and a design-and-build company?

An architect provides design & planning services but is typically not responsible for construction. A design-and-build company like Charles Grosvenor handles design, planning and construction under a single contract. For the homeowner, the main differences are a single point of accountability, a fixed price agreed before work starts, and no need to coordinate between separate professionals.

About Charles Grosvenor

Charles Grosvenor is a specialist loft conversion company with a combined in-house design and build experience of over 100 years across our board of Directors. We are not a general contractor that takes on loft work alongside other projects – loft conversions are the only thing we do.

Our team includes in-house designers, structural engineers, project co-ordinators and construction crews, all of whom work exclusively on loft conversion projects. That focus means the people advising you have seen the specific challenges your type of property presents many times before.

For more information about Charles Grosvenor click here.
Click here to read a detailed list of areas that Charles Grosvenor covers.

Find out how we can transform your loft space

The best starting point is a FREE home survey. One of our team will visit your property, assess the roof space, and give you a clear picture of what type of conversion is realistic, whether planning permission will be needed, and what the project will cost.

There is no obligation to proceed, and no fee for the survey.

Book your free home survey or call us on 01527 543668 – we are happy to answer questions before you commit to a visit.