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House Extensions
Rear, side and larger home extensions planned around the property, the drawings and the way the new space needs to work.
Explore House Extensions →Residential building specialists
Extensions & home improvements, built around your home
We help homeowners deliver extensions, loft conversions, renovations and new-build projects across North West London, Watford, St Albans, Harpenden and Luton.
Planning permission approved?
Let’s turn your plans into a completed home.
Send us your drawings and tell us about your project. We can review the information available and discuss the next practical step.
Send us your drawings and tell us about your project
- Established in 2004
- 4.7/5 from 26 MyBuilder reviews
- Residential construction projects
Residential projectsEstablished in 2004
Company no. 05279982
4.7/5 from 26 MyBuilder reviews
Serving homeowners across five core areas
How we can help
Four ways to move your home project forward
These are the project types homeowners ask us about most. Our complete range of connected services remains available on the Services page.
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Loft Conversions
Practical new living space with structure, access, light, insulation, services and finishing considered together.
Explore Loft Conversions →03
Renovations & Refurbishments
Coordinated property improvements, from preparation and service alterations through to kitchens, bathrooms and final finishes.
Explore Renovations & Refurbishments →04
New Builds
A connected route from site preparation and structural work through to services, interiors and handover.
Explore New Builds →
A practical partnership
Planning the work is part of doing it well
Successful building work begins with listening. We take time to understand how the space needs to function, what matters most and which decisions should be resolved before construction starts.
Clear communication continues through each stage, helping clients understand progress and make informed choices without unnecessary pressure.
Selected projects
See how building work develops, not only the final photograph
Explore the work involved in extensions, loft conversions and home renovations, with photographs of the completed spaces.
Rear extension and interior connection
Loft conversion and additional living space
Kitchen renovation and coordinated finishing
Why Altair Building
An established, practical building partner
Established in 2004
Altair Building Limited was incorporated in 2004. Our work today focuses on residential building and home improvements.
Real residential experience
Our work covers extensions, loft conversions, refurbishments and connected interior and exterior improvements.
Clear homeowner communication
Important site decisions are discussed with the client instead of being hidden behind assumptions.
Connected project coordination
Structural, installation and finishing stages can be organised within one agreed project scope.
Our process
From your plans to your completed home
Have planning permission and drawings ready? Here is how we can help. If you are at an earlier stage, you are welcome to get in touch too.
- 01
Send us your drawings
Share your plans, property location and the work you have in mind. Earlier-stage enquiries are welcome too.
- 02
We review your project
We review the information available and identify anything else needed to understand the scope.
- 03
We discuss your requirements
We talk through your priorities, proposed work and practical considerations.
- 04
We visit where appropriate
Where a visit will help, we arrange to review the property and site conditions with you.
- 05
We provide a detailed quotation
The quotation sets out the proposed scope and allowances, including any matters still requiring investigation.
- 06
We build your project
Once the scope, quotation and contract are agreed and required approvals are in place, work progresses through construction to completion and handover.
Service area
Local knowledge, practical reach
We work across North West London, Watford, St Albans, Harpenden and Luton, with surrounding areas considered according to the project.
- North West London
- Watford
- St Albans
- Harpenden
- Luton
- Surrounding areas
Customer feedback
What homeowners valued during the work
Selected customer feedback, originally published on MyBuilder.
Very high quality build, very reasonable price, very nice person to deal with, excellent timekeeping.
Originally published on MyBuilder
They would turn up at 8am without fail, they respected the neighbours.
Originally published on MyBuilder
Great quality work, efficient and really tidy.
Originally published on MyBuilder
Useful answers
Questions before you begin
We support a broad range of residential building, renovation, finishing and external improvement projects. The most suitable scope is discussed after learning about the property and your priorities.
We first clarify the proposed work and inspect the property where appropriate. The quotation can then set out the agreed scope, expected stages and known labour or material allowances, while identifying anything that still needs investigation.
Our core service area includes North West London, Watford, St Albans, Harpenden and Luton. Projects in surrounding areas can be discussed individually.
We discuss how the property is used, what you would like to change, your practical priorities and the available budget. We also identify surveys, drawings or specialist input that may be needed.
We can help identify when planning, structural or Building Regulations input is likely to be relevant and coordinate with suitable professionals where agreed. Formal decisions remain with the relevant authorities.
The communication approach is agreed before work begins. Updates focus on progress, upcoming decisions and any issue that could affect the agreed scope.
Planning permission approved?
Let’s turn your plans into a completed home.
Send us your drawings and tell us about your project. We can review the information available and discuss the next practical step.
07984 003 480Send us your drawings and tell us about your project