More Home.
We are a team of innovative and dynamic architects who adopt a smart approach when it comes to creating designs and spaces that capture your requirements perfectly.
15+
Years in practice
200+
Projects completed
RIBA
Chartered practice
ARB
Registered architects
Loft Conversion Architect London
As an industry-leading architect, we take a professional approach to each project we undertake to ensure we deliver an end-product that you can be proud of. We utilise cutting-edge technology such as CAD and BIM to deliver impressive results, making us the team you have been searching for.
We are London architects with a wealth of experience in both residential and commercial property, providing a quality certified service that is refined and experienced.
House Extension Architect London
We thrive on dedicating ourselves to creating aesthetically pleasing spaces. From measured drawings to architectural drawings, structural calculation, planning permission and party wall agreements, we deliver a complete service that enables you to take a hands-off approach.
As a leading house extension architect London, we have built a team of proven and professional designers who have the scope to create something that captures everything you desire.
15+
Years in practice
200+
Projects completed
98%
Planning success rate
32
London boroughs served
Our Services
Everything in-house
Structural Engineer
Structural calculations and engineering for lofts, extensions and renovations.
Everything Handled In-House
From the initial meeting through to completion, London Architect handles every aspect of the process — and delivers spaces you simply fall in love with.
- Initial drawings and design concepts
- Structural calculations and planning permission
- Interior design and party wall agreements
or call 020 8050 4792
Why Choose Us?
We offer innovative architectural building design and planning services in London. Whether you are looking for a loft conversion architect, a new house build or an extension on your current property, we can undertake both small and large-scale projects.
House Renovation Architect London
We understand that taking that next step and creating your dream space can seem like a challenge, but with us by your side, we make the entire process as streamlined and stress-free as possible.
- Measured and architectural drawings
- Structural calculations and planning permission
- Interior design and party wall agreements
Everything is taken care of in-house, leaving you to sit back and watch as we work to transform your home and your space with ease and precision.
Loft · Camden
15+Years in practice
200+Projects completed
98%Planning success
32Boroughs served
Recently Finished Projects
House extensions & lofts across London
Loft conversion — London01
Loft conversion — London02
Loft conversion — London03
Loft conversion — London04
Loft conversion — London05
Loft conversion — London06
LOFT — CAMDEN, 2026
Case Study Heading Here
Case-study paragraph placeholder — the brief, the constraint, and the design move that solved it. Two or three sentences.
Second paragraph placeholder — how the space is used now, and what changed for the family living there.
Frequently Asked Questions
The questions we are asked most often about loft conversions, extensions and planning in London.
How long does a loft conversion or extension take?
From the first survey to planning approval is typically three to four months. Construction on a standard dormer conversion runs eight to ten weeks. We give you a programme at the start and update it whenever anything moves.
Do I need planning permission?
Permitted development covers most rear dormers and single-storey rear extensions. Conservation areas and flats always need a formal application. Where work is exempt we recommend a Lawful Development Certificate, which protects the value of the work when you come to sell.
What does it typically cost?
A rooflight-only loft conversion is the most economical route. A rear dormer with a new bathroom sits in the middle of the range, and mansards and full-width wrap-around extensions occupy the top. We provide a detailed cost plan at feasibility stage and design to it.
Which areas of London do you cover?
We work across Greater London. The Area We Cover section on this page lists the boroughs and neighbourhoods we serve most often — if yours is not shown, ask, because it is usually still within reach.
Work In Motion
More Home.
Loft conversions, extensions and renovations designed, drawn and approved — one team, in-house, across London.
Rear extension — Islington2026
Loft Conversions, Extensions and Renovations in London
Space is the scarcest commodity in a London home. Families grow, work moves into the house, and the rooms that felt generous a decade ago start to feel tight. For most homeowners the choice comes down to two options: move, with all the stamp duty, agent fees and upheaval that entails, or stay and make the building work harder.
Every project we take on starts with the same question: what is the most valuable space this building can give you? Sometimes the answer is a full mansard loft with two bedrooms and a bathroom. Sometimes it is a modest rear extension that transforms a dark galley kitchen into the room the whole family lives in. The right answer depends on the fabric of the house, the planning context of the street, and the way you actually live — which is why we begin with a measured survey and a conversation, not a standard package.
Moving up the ladder in London routinely costs six figures once stamp duty, fees and the price gap between houses are counted. A well-executed conversion or extension typically costs a fraction of that, adds directly to the value of the home you already own, and lets you stay in the street, the school catchment and the community you chose.
Which Loft Conversion Suits Your House?
02 — Options
London’s housing stock is remarkably consistent — Victorian and Edwardian terraces, 1930s semis, post-war infill — and each type points toward a particular conversion strategy. These are the four we design most often:
Dormer Conversion
A box dormer to the rear is the workhorse of the London loft: it adds full head height across most of the new floor, usually falls within permitted development, and suits the majority of terraced houses.
Hip-to-Gable Conversion
On semi-detached and end-of-terrace houses, rebuilding the sloping hip as a vertical gable releases the space a dormer alone cannot reach — often the difference between a bedroom and a bedroom with an en-suite.
Mansard Conversion
The most generous option, reshaping the whole roof plane at 70 degrees. Mansards almost always need planning permission, but in conservation areas they are frequently the approach planners prefer because they follow a historic London roof form.
L-Shaped & Velux Conversions
An L-shaped dormer over a rear addition can create two rooms and a bathroom in one build, while a rooflight-only conversion is the lightest-touch route where head height already exists.
Head height is the first thing we check on a survey: 2.2 metres from the existing ridge to the top of the ceiling joists is the practical threshold. Below that, the conversation turns to lowering ceilings or raising the ridge — both possible, both with cost and planning implications we will set out honestly before you commit to anything.
Do You Need Planning Permission?
More often than not, no. Most rear dormers, hip-to-gable conversions and single-storey rear extensions fall within permitted development rights, which allow substantial alterations without a full planning application — up to 40 cubic metres of additional roof space on a terraced house and 50 cubic metres on a semi or detached house. We still recommend applying for a Lawful Development Certificate, which formally confirms the work is lawful and protects you when you come to sell.
Full planning permission becomes relevant when the house sits in a conservation area, when the design steps outside permitted development volumes, or when the property is a flat or maisonette, which has no permitted development rights at all. This is where local knowledge earns its keep: we prepare drawings that anticipate each borough’s published guidance, and where a scheme is ambitious we will often seek pre-application advice so surprises surface early, not after months of waiting.
- Permitted development covers most rear dormers and single-storey rear extensions
- Conservation areas and flats always need a formal application
- A Lawful Development Certificate protects the value of exempt work
- Pre-application advice de-risks ambitious schemes before full submission
NOTE — PARTY WALL ACT 1996
Almost every terraced or semi-detached project in London touches a shared wall. Notices must be served on neighbouring owners before structural work begins, and where a neighbour dissents, a surveyor prepares an award recording the condition of both properties. It sounds daunting; in practice it is routine — we prepare the structural information surveyors need and coordinate the process so it runs alongside design development rather than delaying the start on site. Most agreements are concluded within four to six weeks, and serving notices early in design development means the award is usually in place well before your builder needs access to the wall.
What Does It Cost?
No two houses price identically, but after two hundred projects the patterns are reliable. A rooflight-only loft conversion is the most economical route; a rear dormer with a new bathroom sits in the middle of the range; mansards and full-width wrap-around extensions occupy the top. As a working guide for budgeting conversations:
Velux / Rooflight Loft
The entry point — typically the cost of a good family car
Rear Dormer + En-Suite
The most popular package on London terraces
Hip-to-Gable + Dormer
Adds roughly 15–20% over a dormer alone
Mansard Conversion
The premium option, priced nearer a small extension
Rear Extension
Driven chiefly by glazing, structure and kitchen specification
Rear extension, completed02
We provide a detailed cost plan at feasibility stage and design to it. The drawings we issue for tender are thorough enough that builders price the same job — which is how you avoid the mid-project extras that give construction its reputation. Where budgets are tight, we will tell you which moves buy the most space per pound and which finishes can be phased for later without redoing work.
Our Process, From First Call to Completion
A clear process is the difference between a project you enjoy and one you endure. Ours has six stages, and you will always know which one you are in:
Free Consultation
A phone call or home visit to understand what you want to achieve and give you an honest first view on feasibility, budget and planning risk.
Survey & Feasibility
We survey the property, test layout options against head heights and structure, and agree the brief and budget with you.
Design & Planning
Developed drawings, planning or lawful development submission, and liaison with the borough until consent is secured.
Technical Design
Building-regulation drawings, structural engineering and specifications — the package builders price from.
Tender
We invite quotes from vetted contractors, level the prices, and help you appoint on evidence rather than instinct.
Construction
Site visits at agreed stages, valuations checked before payment, and snagging inspected before final sign-off.
From first survey to planning approval typically takes three to four months; construction on a standard dormer conversion runs eight to ten weeks. We will give you a programme at the start and update it whenever anything moves.
Ready to Start Your Project?
Area We Cover
