01 · NEW BUILDS
New Builds
Ground-up residential and commercial new builds in London and Greece, coordinated from planning through structural and interior delivery.
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London · Greece · Europe
Building considered spaces, delivered with discipline.
A London-based construction and design partner for private homeowners and professional teams who expect architectural sensitivity, premium finish quality, and a build process they can trust.
Trusted by private clients, developers, architects and design studios across central and greater London.
New Builds
Renovations & Refurbishments
Extensions
Interior Fit-Out
Design & Build
Project Management
Architectural Consultancy
Heritage Refurbishment
Why GG
A studio built on continuity, not novelty.
Three decades of senior site experience meets a new generation of design-led leadership. The result is a studio that reads drawings carefully, builds with care, and communicates clearly from first sketch to final handover.
01
Architectural sensitivity
We treat every project as a piece of architecture, not a job number. Materials, proportion and detailing are taken seriously.
02
Senior site discipline
Decades of complex London builds inform how we sequence work, manage trades, and protect programme and budget.
03
Considered communication
Clear scopes, structured updates, and a single point of contact. Discreet, responsive, and accountable throughout.
What we deliver
A focused construction and design practice.
From private residences in central London to commercial fit-outs and full design-and-build projects, our service is structured to suit both private clients and professional partners.
02 · RENOVATIONS
Renovations & Refurbishments
Whole-house refurbishments and considered renovations for period and contemporary properties, end-to-end.
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03 · EXTENSIONS
Extensions
Side returns, rear, wraparound, basement and loft extensions designed to add space without compromising the original property.
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04 · DESIGN & BUILD
Design & Build
An integrated design-and-build route that brings architectural intent, technical detailing and on-site execution under one accountable team.
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Who we work with
Private clients and professional partners.
We are equally comfortable working directly with homeowners on a discreet, considered project, and embedded into a professional team alongside architects, developers and operators.
For homeowners
A calm, design-aware partner for the most personal project you will commission.
You want a home that is well-built and well-considered. You also want the process to be clear, respectful of your time, and free of unnecessary stress. That is the brief we hold ourselves to.
- Whole-house renovations, extensions and bespoke interiors
- Heritage-aware approach for period properties
- Single accountable point of contact and structured updates
- Discretion and care on site, including occupied projects
- Coordinated trades, finishes, joinery and services
For businesses & professionals
A reliable delivery partner for developers, architects, designers and operators.
You need a contractor who can read drawings carefully, hold a programme, and protect the design intent. We work transparently with consultants and treat collaboration as a competitive advantage.
- Design & build, traditional and CM routes
- Boutique commercial, hospitality and retail fit-out
- Developer projects — single units to small schemes
- Integration with appointed architects and designers
- Pre-construction input on cost, sequencing and buildability
Process
A structured route from first conversation to final handover.
Every project moves through the same considered sequence. The depth changes with scale, but the discipline does not.
- 01
Consultation
Understanding your brief, ambitions, budget and timeline.
- 02
Site Review
Walkover, measured assessment and pre-construction observations.
- 03
Scope & Planning
Detailed scope, programme and cost framework agreed in writing.
- 04
Build Delivery
Site set-up, trade coordination and structured progress reporting.
- 05
Finishing & Handover
Final finishes, snagging, commissioning and a clean handover.
- 06
Ongoing Support
Aftercare, defects period and a long-term relationship for future works.
Leadership
Two generations. One standard.
Senior site authority and design-led architectural thinking, working as one practice. The combination is intentional — and it is what gives the studio its character.
Founder · Construction Director
Costas Andreopoulos
Senior construction authority.
Three decades of senior construction experience, with a long-standing track record of delivering luxury residential projects in central London — including work associated with high-end Kensington clientele. Costas brings the calm authority, technical instinct and trade relationships that define the studio's delivery standard.
- 30+ years in construction and refurbishment
- Specialism: luxury London residential delivery
- Markets: central & greater London, Greece, Europe
CEO · Design & Strategy
George Kastanidis
A new generation, design-first leadership.
Architecturally trained and design-literate, George leads the studio's contemporary direction — bringing architectural rigour, considered material thinking and a modern client experience into every project the practice takes on.
- MArch · Master of Architecture, Kingston University · 2022 – 2024
- BA Architecture · University of East London · 2018 – 2021
- Focus: design intent, client experience, future of the studio
Selected work
A practice judged by its finished work.
A small selection of recent and representative projects. Imagery shown is illustrative — to be replaced with real project photography prior to launch.
Kensington Townhouse
Whole-house refurbishment with bespoke joinery and refined material palette.
Chelsea Apartment
Full interior refurbishment for a private client, delivered while occupied.
Hampstead Residence
Ground-up new build for a family home, design coordinated with appointed architects.
Notting Hill Extension
Side return and rear extension with structural opening to the garden.
Boutique Fit-Out
Premium retail fit-out delivered to architectural specification on accelerated programme.
Coastal Villa, Greece
Ground-up residential build coordinated remotely from London with on-site delivery team.
Selected sectors
Where our work tends to live.
We are selective about the projects we take on, focusing on work where craft, design, and considered execution are genuinely valued.
Private Residential
Family homes, apartments and pieds-à-terre in central and greater London.
Luxury Refurbishment
High-specification refurbishments of period and contemporary properties.
Developer Projects
Single-unit and small-scheme delivery for selected residential developers.
Boutique Commercial
Workspace, studios and small commercial fit-outs delivered to architectural intent.
Hospitality & Lifestyle
Restaurants, members spaces and lifestyle interiors for design-led operators.
Growth strategy
A site built to grow with the business.
The single-page concept you are reviewing is structured to expand into a full content ecosystem — service pages, area pages and a blog hub — without rebuilding the foundation.
Service landing pages
- /new-builds-london
- /luxury-home-renovation-london
- /house-extension-london
- /design-and-build-london
- /commercial-fit-out-london
- /project-management-london
Location / area pages
- /areas/kensington
- /areas/chelsea
- /areas/knightsbridge
- /areas/notting-hill
- /areas/hampstead
- /areas/greece
Blog & content hub
- How to brief a construction partner in London
- What a high-end home renovation actually costs
- Period property refurbishment: what to plan first
- Design & build vs. traditional contracts
- Side-return extensions: design considerations
- Working with architects: a contractor's view
- Renovating a London home while living in it
- Choosing finishes for a long-term residence
- Building or renovating in Greece from the UK
- Fit-out for boutique hospitality: programme & risk
Client voices
Quietly accountable. On time, on standard, on brief.
Voices below are illustrative placeholders — to be replaced with real client and partner quotes prior to launch.
Placeholder
"They cared about every joint, every reveal, every transition. The build matched the drawings — which sounds simple and almost never is."
Architect · Central London project
Placeholder
"Calm, organised, and present on site. The communication alone made it the most enjoyable renovation I have done."
Private client · Whole-house refurbishment
Placeholder
"They understood the spec, protected the programme and delivered. We'd happily put them on the next scheme."
Developer · Residential scheme
FAQ
Questions clients ask before working with us.
If you don't see your question here, the contact form below reaches us directly.
Yes. We deliver projects throughout central and greater London, with a particular focus on Kensington, Chelsea, Knightsbridge, Notting Hill, Hampstead and the surrounding districts. We also undertake selected work in Greece and across Europe.
Yes. Our design-and-build route brings architectural intent, technical detailing and on-site delivery under one accountable team. Equally, we work as a build-only partner alongside your appointed architect or designer.
High-end residential is the core of our practice. Our senior leadership has decades of experience delivering luxury London homes, and we are selective about taking on work where craft and finish quality are central to the brief.
Often. We are comfortable working transparently within a professional team, contributing buildability input, sequencing advice and cost intelligence without ever diluting design intent.
As early as possible. Pre-construction input on programme, cost and sequencing is most valuable before drawings are frozen. That said, we are equally able to step in once a scheme is fully designed and tendered.
Yes. We offer independent project management and pre-construction consultancy for clients working with their own contractor or design team — or as part of a fully delivered design-and-build engagement.
We deliver everything from focused refurbishments of a single floor to whole-house projects, new builds and small developer schemes. Selectivity matters more to us than scale.
Use the form below or message us directly via WhatsApp. An initial consultation is free and confidential, and helps both sides establish whether the project is a fit.
Contact
Begin a considered project.
Tell us a little about your property, your ambitions and your timeline. We respond personally, usually within one working day.
