PAYTE
Extension Architect Chelsea
Principal Designer & Higher Risk Building Expert
Our Chelsea architects have extensive experience in extension architecture, specialising in loft conversions, basement extensions, bespoke extensions, rear extensions, two-storey and single-storey extensions, contemporary designs, double-storey extensions, Mansard roof extensions, and ground-floor extensions.
house extension architect Chelsea
Our firm specialises in house architecture in Chelsea, most commonly Victorian houses. We take pride in helping our clients enhance their property value while optimising space. We create bespoke designs and contemporary design extensions with interior reconfigurations to maximise natural light and extra space. Our creative design team elevates the planning process to a new level.
As a leading architectural practice, we specialise in helping homeowners navigate the planning process, building regulations, planning permissions, party walls, and building control. Our experienced team handles all regulatory challenges in extension projects, making your home’s transformation seamless and stress-free.
We carry out architectural work for rear, wraparound, side return, or infill extensions to best suit your space and increase its value. We begin with our design process, initial drawings, structural calculations, and 3D visualisations to assist clients in picturing the transformation, alongside a precise scope of work for the building contractor. Let us help expand your floor space and elevate your property’s worth. Our expertise ensures that each project is expertly designed to meet your specific needs.
Being experienced West London extension architects, we deliver bespoke residential design solutions tailored to the character, planning context, and long-term value of each home.
apartment Extension architects
We specialise in providing comprehensive design and architectural services for apartment extensions in Chelsea. Our offerings include detailed planning advice, design layout changes, custom joinery, and regulatory drawing preparations. Whether you are looking to completely revamp your apartment’s layout or to implement specific modifications, we manage every aspect of the project.
Our services encompass the entire process, from securing planning permission and building approvals to obtaining landlord consents and the necessary license to alter documentation. We also handle all planning applications ourselves.
Additionally, we offer project management as part of our complete service package. Our architectural service ensures a seamless transformation of your space, enhancing both functionality and aesthetics to create modern, stylish living environments.
As an experienced extension architect, we design thoughtful, well-considered house extensions tailored to each property’s character, planning context, and long-term value.
extension conversion package
3 Meter rear extensions package
£60,000.00 INC. VAT
What’s included:
6 Meter rear extensions package
£104,700.00 INC. VAT
What’s included:
At Payte Architects London, our rear extension service is about making it simple to gain more space without losing control of cost or complexity. With over 10 years’ experience on Chelsea homes, we offer two fixed‑price packages at three and six metres (including VAT), so you choose how far to extend and we handle design, approvals and on‑site work up to first fix.
You’ll work with a friendly architectural team that actually picks up the phone. All architectural work is carried out by architects registered with the Architects Registration Board (ARB) or chartered with the Royal Institute of British Architects (RIBA), and we coordinate closely with our dedicated extension build team so design and construction stay joined‑up from day one.
We take care of the planning route – from Lawful Development Certificates for three‑metre projects to prior‑approval applications for six‑metre schemes – using our experience with boroughs such as Haringey Council’s planning team, Lambeth Council’s planning service and Brent Council planning to shape proposals around what local councils typically support.
Throughout, we keep communication simple and regular so you always know where your project is and what’s coming next, aiming for a bright, well‑built Chelsea extension that quickly becomes the main room everyone uses.
Exclusions
This package is not applicable to property where you need planning permission or listed building consent, or if there is an article 4 on your property.
In addition to the above, the following exclusion applies:
- Party wall award
- Building control fees
- Any specialist consultants
- Asbestos removal fees
- Finishing (sanitary ware, tiling, floor finishing, wall finishing, joinery).
- Party wall award
- Building control fees
- Any specialist consultants
- Asbestos removal fees
- Finishing (sanitary ware, tiling, floor finishing, wall finishing, joinery).
ARRANGE A FREE CONSULTATION
Arrange a free consultation with an architect, we offer clients a 30 minute consultation.
FREE NO OBLIGATION CONSULTATION
VIRTUAL CONSULTATION AVAILABLE
ON SITE CONSULTATION AVAILABLE
Innovative Chelsea Extensions Crafted with Exceptional Architecture
Our Chelsea architects create smart, sustainable extensions that suit your space perfectly.
Wraparound
We specialise in wrap-around extensions. This is a popular way to expand and transform properties. This extension combines a rear and side addition. It creates an L-shape that expands ground-floor space. This is ideal for open-plan kitchens, living spaces, or adaptable rooms that fit modern lifestyles. We handle everything from design and planning permission to construction.
Single Storey
A single-storey extension can really boost space in your Chelsea property. It can be added to the back or side of the property. This addition offers more space for a modern kitchen, a living area, or a home office. This extension improves the flow inside and makes the property more practical. Our architectural team makes it easy for you to get great results that suit your property.
Multi Storey
A multi-storey extension in Chelsea can provide a lot of space. You can use it for extra bedrooms, bigger living areas, or more bathrooms. Building up on your property lets you make the most of it without losing any garden space. We take care of everything. This includes planning, permissions, and construction. We ensure your extension fits well with the current architecture.
Side Return
A side return extension utilises the unused space beside your home. You often find this add on in Victorian and Edwardian buildings in Chelsea. Clients can extend into this narrow area to make a wider, open-plan kitchen. This change will let in more natural light. Our architects are experts in side return extensions. These designs boost functionality and add to the property’s value.
Rear Extension
A rear extension expands the back of your property. This gives you room for an open-plan kitchen, a larger dining area, or a more spacious living room. This is ideal for clients looking to improve their ground floor. These extensions boost natural light and link indoor and outdoor spaces smoothly. We create rear extensions that match your home’s style. They also boost efficiency and value.
Seamless Chelsea Home Extensions from Concept to Completion
Our team of architects, designers, and builders in Chelsea creates stylish and practical home extensions. We handle each stage, from the first meeting to the final build, with care and precision.
Free Initial Consultation
In your 30-minute free consultation, we’ll discuss your project vision, design choices, size, and budget for the extension. This process ensures that we can align your ideas with the practical aspects of the project with accuracy.
Full Architecture Service
We offer bespoke services for home extensions. This features on-site assessments, detailed drawings, 3D visualisations, planning applications, and tender management. We customise each service to meet your unique needs.
Planning & Permissions
Our Chelsea architects focus on extension planning. Our professional practice handles it all, from the initial idea to final approval. We carefully find ways to handle local rules, stay within zoning laws, and meet building codes.
Complete Building Works
We’re a full-service architecture firm that specialises in extensions. We have in-house architects, interior designers, and building contractors. Our team ensure easy collaboration, guiding your project till its delivery.
Local Topic
General information only. Planning and licensing rules change and depend on the individual property. This article is not legal or professional advice.
CHELSEA — THE ORANGERY EXTENSION: THE FORMAL GARDEN ROOM COMPOSED PROPERLY (DESIGN; DOC L)
Ask what an orangery actually is and the answers wander — something with a lantern? A posh conservatory? The word has been borrowed so freely by the double-glazing industry that its real meaning nearly drowned. Which is a pity, because the real thing is one of the loveliest building types England ever produced, it has three hundred years of pedigree, and Chelsea is precisely where it belongs.
Start with what it was. The seventeenth-century estate orangery wintered citrus trees for owners who wanted visitors to understand they could winter citrus trees — status architecture with a horticultural alibi. Solid masonry walls.
Tall, ordered windows between proper piers. A real roof, and at its heart the glazed lantern pouring top light into the middle of the room. More wall than a conservatory, more light than an ordinary extension. That middle voice is the whole type.
And here’s the thing we find ourselves explaining in Chelsea meetings: the rules that made it beautiful are the same rules that make it work. This isn’t nostalgia — it’s physics wearing a periwig.
Take the walls. A conservatory is nearly all glass, which is why it roasts in July, freezes in January, and was never honestly a twelve-month room. The orangery’s masonry-to-glass ratio sits far more comfortably against Approved Document L; the insulated, plastered, properly weathered roof carries real thermal weight; and the lantern — specified to modern standards, with the GGF’s guidance covering the glazing — delivers the drama without the greenhouse penalty. The Georgians didn’t know the term U-value. They’d built for it anyway.
Then the manners, which matter in this borough more than most. An orangery reads as a formal object, so it has to converse with a formal house — string courses aligned, parapet answering the host’s datum lines, brick or render matched with intent rather than approximated.
The Georgian Group’s material on garden buildings shows the lineage the best modern versions descend from, and RBKC assesses these gardens street by street, where Chelsea’s walled plots reward exactly what the type does best: a composed pavilion sitting in the garden rather than consuming it.
Where does it succeed or fail? In the details, always. The lantern’s junction. The window joinery’s sections — vertical, ordered, symmetrical unless the plan genuinely argues otherwise.
The shadow line where masonry meets glass. This is technical design work from the first sketch, detailed like furniture rather than construction, because the room’s formality means every junction is on show forever.
The market version — uPVC, flat-pack lantern, pilasters glued on like apologies — borrowed the name and dropped everything that earned it.
The real thing is slower, dearer, and worth both: wall, light, and three centuries of a building knowing exactly what it is. The citrus is optional now. The composure never was.
Chelsea Home Extension Planning, Design, and Construction
Feasibility Studies for Home Extensions
Our Chelsea property extension architects carry out comprehensive feasibility studies. They look at structural integrity, space potential, and costs. This ensures that property expansions are smart and efficient.
Planning Permission for Extensions
Our team of architects collaborates with local councils. We navigate planning policies, building codes, and zoning laws to ensure smooth compliance. Our expertise simplifies the process, providing a stress-free experience.
Project Management and Contractor Coordination
We monitor construction progress, project timelines, and project quality. This way, we ensure everything operates without issues and according to schedule. We focus on details to ensure everything runs smoothly from start to finish.
Sustainable Extension Materials & Energy Efficiency
Our eco-friendly extension designs and insulation solutions improve property energy efficiency, sustainability, and comfort. Our approach reduces environmental impact and improves thermal performance.
Structural Engineering and Load-Bearing Analysis
We check that extensions meet safety, stability, and regulatory standards. We do this with structural assessments and compliance checks. Our team makes sure that a property extension blends in well, is safe, strong, and built to endure.
Interior To Exterior Extension Flow and Aesthetic Integration
Our architects mix new extensions with the current style. This creates a smooth transition between the old and the new. Our architects respect the original structure while enhancing functionality, aesthetics, and flow.
why work with us?
Fast Turn Around
We deliver swift completion of extensions by leveraging our efficient planning, expert team, and streamlined project management, ensuring a smooth and expedient process.
Fixed Pricing
We provide transparent, fixed pricing for architectural and building services for extensions, offering clients a clear understanding of costs. This approach allows for confident budgeting.
We Maximise Value
We guide clients to achieve the best outcome for extensions, balancing the investment benefits with a comfortable living space. Our expert advice ensures maximum financial value.
Turnkey Operation
We offer a full-service for home extensions, guiding clients from the initial consultation to project sign-off. You will have a dedicated account manager overseeing every detail.
recent EXTENSION projects
Local Topic
General information only. Planning and licensing rules change and depend on the individual property. This article is not legal or professional advice.
CHELSEA — THE FRAMELESS EXTENSION: STRUCTURAL GLASS BEAMS, FINS AND CORNERS (ISTRUCTE; BS 6180)
There’s a Chelsea extension type where the glass stops being the infill and becomes the building. No steel frame wearing glazing — glass beams carrying glass roofs, glass fins bracing glass walls, corners that meet as a silicone line and nothing else. Frameless. From the garden it barely registers as enclosure at all, which is the entire point.
It’s also the most engineering-dense extension per square metre that domestic work offers, and understanding what you’re actually buying is half the brief.
Glass doing the lifting
Ordinary extensions use glass to keep weather out. Structural glazing asks it to hold the building up — and that changes everything about specification. The working material is laminated, toughened glass: multiple layers bonded with structural interlayers, engineered so that if one layer ever fails, the others carry on carrying.
Beams, fins and floor-to-ceiling panels each get designed — genuinely calculated, by an engineer fluent in the material — against loads, deflection and the post-breakage behaviour that glass design obsesses over precisely because the material forgives nothing.
Standards run through all of it: BS 6180 where glazing acts as barrier, the glass design codes behind the calculations, and the specialist facade-engineering knowledge that bodies like the CWCT. The Centre for Window and Cladding Technology — exist to codify.
The GGF covers the broader glazing industry’s ground. This is not a products-catalogue corner of the industry. Every serious frameless project is bespoke engineering.
Which is why the geometry gets modelled to the millimetre before fabrication. The panels arrive finished, unalterable, from factories working to tolerances site bricklaying has never met, and that survey-and-model discipline is BIM territory in miniature: measure the crooked Victorian opening precisely, or own a very expensive gap.
Trade-offs, stated plainly
Candour the brochures skip. Thermally, even excellent structural glazing loses more heat than an insulated wall — Approved Document L will make the extension prove itself, usually against the whole-house arithmetic. Solar gain is real: a frameless box facing south-west needs a shading strategy or it becomes a beautiful place to be uncomfortable.
Maintenance means access for cleaning designed in from day one, because the material’s magic is also its surface area.
And cost: frameless runs a multiple of framed glazing, concentrated in engineering, fabrication and the millimetre-work of installation.
In RBKC’s conservation streets, the type’s near-invisibility is often exactly what wins consent behind sensitive rears — the addition that’s barely there — which is a planning virtue with an engineering price.
Worth it? On the right house, unreservedly. A frameless room off a Chelsea garden is as close as domestic architecture gets to sitting outside with the heating on.
Just know what it is: not a big window. A building made of its own windows, engineered like it matters — because in this material, everything does.
FAQ
Services
We offer a comprehensive suite of architectural services for Chelsea, our skilled architects each specialise in distinct disciplines. This diversity allows us to tailor our approach to meet the various facets of architectural design.