Your Trusted Partner in Architecture, Engineering & Construction Excellence

Design • Approve • Visualise • Build

Design and Build London

Turn Your Ideas Into Reality

Whether you are extending, renovating, remodelling or completely transforming your property, Grand Designs International can manage the entire journey.

From planning and regulatory approvals through to photorealistic 3D interior and exterior design, material selection, procurement and construction, our integrated approach gives clients greater control, clearer communication and a more coordinated project — without appointing several different companies.

  • Planning
  • Approval
  • 3D Design
  • Material Selection
  • Material Supply
  • Construction
  • Completion
Luxury living room 3D interior design by Grand Designs International
One team · One vision · One complete solution
Planning and construction services

Our Complete Project Journey

Seven coordinated stages, one professional team. Select a stage to see what is included.

01

Consultation & Concept

We start by understanding your requirements, your property, your budget and your overall vision — then shape a clear concept and a realistic plan for delivering it.

  • Site visit
  • Brief & budget
  • Feasibility
  • Concept options
02

Planning & Approval

Planning drawings, applications, Building Regulations and other relevant technical approvals, prepared and managed by our team so your project can move forward with confidence.

  • Planning drawings
  • Planning applications
  • Lawful development
  • Building Regulations
  • Structural calculations
  • Party wall coordination
03

3D Interior & Exterior Design

Realistic 3D visualisations let you see the proposed project before construction begins — and refine it until it is exactly right.

  • Exterior design
  • Interior layouts
  • Kitchens
  • Bathrooms
  • Bedrooms
  • Living spaces
  • Lighting
  • Furniture
  • Finishes
  • Landscaping
04

Material Selection

Select and compare proposed materials before construction, with your choices shown in the 3D model so you can judge the finished result.

  • Flooring
  • Tiles
  • Stone
  • Marble
  • Timber
  • Kitchen finishes
  • Bathroom finishes
  • Doors
  • Windows
  • Wall finishes
  • Lighting
  • Fixtures
  • External cladding
  • Roofing
  • Decorative finishes
05

Material Supply

Where agreed, we can assist with sourcing and supplying your selected construction and finishing materials — coordinated with the build programme so the right materials arrive at the right time.

  • Sourcing
  • Procurement
  • Delivery coordination
06

Construction

Our construction service turns the approved design into the completed project, managed by one team that already knows every detail of your design.

  • Extensions
  • Renovations
  • Refurbishments
  • Structural alterations
  • Interior fit-outs
  • Kitchens
  • Bathrooms
  • External works
  • Full property transformations
07

Project Completion

Final coordination, finishing and handover — delivering the space you saw in 3D, finished to the standard you selected.

  • Snagging
  • Final finishes
  • Sign-off
  • Handover
3D interior design · 3D exterior design

See Your Project Before We Build It

Our 3D visualisation service allows clients to explore their proposed interior and exterior design before construction begins. See the colours, materials, lighting, finishes and architectural details before making final decisions.

Material selection

Choose Your Materials With Confidence

Stone
Wood
Tiles
Metal
Glass
Paint
Kitchen Finishes
Bathroom Finishes
Lighting

Rather than imagining the finished result, our design process allows selected materials and finishes to be incorporated into the 3D model before construction.

This allows you to compare different combinations — stone against timber, matt against gloss, warm against cool lighting — and make better-informed design decisions before anything is ordered or built.

Interior renovation · Property refurbishment

See the Transformation

Move the slider to compare the existing property with the proposed transformation.

Interior before renovationInterior after - 3D designBEFOREAFTER
↔
Interior Transformation
Exterior before renovationExterior after - completed rear extensionBEFOREAFTER
↔
Exterior Transformation
Why choose us

Why Choose Grand Designs International

One Point of Contact

From planning through construction — one team accountable for your project.

Integrated Design

Architecture, technical design and construction coordinated together.

Realistic 3D Visualisation

See the proposed result before construction begins.

Material Coordination

Select finishes before committing to construction.

Technical Experience

Design decisions coordinated with practical construction requirements.

Project Management

A structured process from concept to completion.

House extension design and build

Choose the Service That Suits You

Every project is different, so every quotation is personalised. Choose the level of support you need.

Design

For clients appointing their own builder
  • Planning
  • Technical drawings
  • 3D design
Request a Quotation

Design + Materials

Design with coordinated finishes
  • Planning
  • Technical design
  • 3D visualisation
  • Material selection
  • Material sourcing
Request a Quotation
Premium · Most complete

Complete Design & Build

One team from concept to completion
  • Planning
  • Approvals
  • 3D interior and exterior design
  • Material selection
  • Material supply
  • Construction
  • Project coordination
Request a Personalised Quotation
From individual homes to large-scale developments

Projects We Design & Build

Design and build · London & across the UK

Ready to Transform Your Property?

From the first sketch to the final finish, our team can help you plan, visualise and deliver your project.

FMB MemberPlanning to completionPhotorealistic 3D designPersonalised quotations

Tell us about your project

Share a few details and, if you have them, upload drawings, photographs or plans. We will reply with next steps and a personalised quotation.