MSJ Contracts Speak to the team07752 250829
Kitchen extension with steel-framed glazing completed by MSJ Contracts
★★★★★ Rated 5.0 on Google · 67 reviews

House Extensions & Renovations in London, Crafted by a Family Firm Since 1993

Exceptional homes deserve exceptional craftsmanship. Arrange a complimentary private consultation and one family team will manage your project, from the initial plans through to the finest bespoke details.

  • Complimentary private consultation
  • Family-run residential contractor, established 1993
  • Your whole project managed from start to finish
  • Bespoke carpentry and joinery as part of every package

Arrange your private consultation

Tell us about your house extension or renovation project. It takes under a minute.

What are you planning?

What is your approximate budget?

Do you have drawings or planning permission?

When would you like work to start?

What is the property postcode?

Your full name

Your email address

Best phone number to reach you

Complimentary consultation · No obligation · Projects from £150,000

Verified Google reviews

Homeowners trust us with their biggest projects

★★★★★ Rated 5.0 on Google, based on 67 reviews
★★★★★

"MSJ recently completed the ground floor extension and full renovation of our Victorian Terrace House. Connor, Ian & the site team were great from start to finish, always very responsive to questions/queries and delivered on the deadlines they set. We'd happily work with MSJ again for future projects."

Jonathan C.Ground floor extension and full renovation
★★★★★

"We recently purchased a house in Greenwich and engaged MSJ to completely redevelop the living area and I cannot recommend MSJ enough. Both the quality of work and service we received were phenomenal, we will be using them again. ... Lastly I'm an incredibly specific and sometimes difficult client when it comes to both finishes and my demands, no one batted an eyelid and the work exceeded my expectations at every turn."

GrantGreenwich, living area redevelopment
★★★★★

"We have just had the pleasure of working with MSJ on remedial structural work of a Grade II Listed property in Walworth. Connor and his team were extremely efficient, helpful and dedicated to getting the job finished on time and on budget. Communication throughout was superb."

Simon T.Walworth, Grade II listed structural work
★★★★★

"Thank you MSJ for transforming our home! Having been let down by previous builders we were looking for reliable and high quality which we got from Connor and Ian & Team. ... Connor and Ian are both great genuine guys providing advice and ideas to have finished to a high standard."

DannyWhole ground floor transformation
★★★★★

"Fantastic work from Conor, Costa and the team, complete renovation on the house to an extremely high standard! Would recommend MSJ highly, the best in South East London!!"

Tracey P.Complete house renovation
★★★★★

"MSJ refurbishment. The whole team worked incredibly hard and to the highest standards to bring the design concept to life around the hectic schedule of our family life. Having you work at our house to make it our home was an absolute pleasure.Thank you!!"

Fiona C.Home refurbishment

Reviews copied from MSJ Contracts' Google Business Profile.

What we build

Three ways we transform homes across London

We take on substantial residential projects, typically £150,000 to £750,000, for homeowners who value craftsmanship and a fully managed service over the cheapest quotation.

Open-plan kitchen extension with steel-framed doors
Most requested

House extensions

For families who need more space without moving.

  • Rear and side-return extensions
  • Wraparound extensions
  • Kitchen and living extensions
  • Structural alterations and knock-throughs
Discuss my extension
Fully refurbished living room with parquet flooring

Full house renovations

For new purchases and period homes that need a complete transformation.

  • Complete refurbishment packages
  • Period and listed property work
  • Structural alterations
  • High-end interior finishes
Discuss my renovation
Bespoke joinery media wall with shelving

Bespoke carpentry and joinery

For larger joinery packages as part of a complete project.

  • Staircases and wall panelling
  • Media walls and built-in storage
  • Kitchens, shelving and cabinetry
  • Detailed finishing joinery
Discuss my joinery
Kitchen extension with exposed brick and rooflights
One team, start to finish

Everything managed for you, from the first plans to the final detail

You deal with one family firm for the whole project, not a chain of separate trades.

  • 1
    A complimentary private consultationWe talk through your plans, drawings, timings and budget with you in person.
  • 2
    Structural and building workExtensions, knock-throughs and structural alterations, priced and built from your architect's drawings.
  • 3
    Bespoke carpentry and joineryStaircases, panelling and built-in joinery finished to the same standard as the build.
  • 4
    Clear communication throughoutDirect contact with the directors, Ian and Connor, from start to handover.
Simple from the start

Three steps to your finished home

No pressure and no obligation. You decide at every stage.

Extension with rooflight over the dining area
Today

Request your consultation

Tell us about your project in under a minute, or call us on 07752 250829.

Rear extension kitchen with glazed doors to the garden
Your consultation

Plan it together

A private consultation to talk through your plans, drawings, timings and budget.

Bespoke walnut staircase and panelling
Build to handover

We build it, you enjoy it

One team manages the whole project, from the structural work to the finest bespoke details.

Recent projects

Extensions and renovations we have completed

A family business

Family-run since 1993, working across London and the South East

MSJ Contracts is a family-run residential contractor with a hands-on, personal approach. The people you meet at your consultation are the people who run your project.

Ian Smith

Managing Director

Over 25 years in construction managing large and medium-sized projects, with a background in carpentry and joinery.

Connor Smith

Director

Your first point of contact, hands-on from the first conversation through to handover.

Martin Smith

Founder

A carpenter and joiner by trade, still guiding the team and visiting sites.

Areas we cover

LondonSurreyKentThe South East
Before you book

Everything homeowners ask before their consultation

What size of project do you take on?

We focus on substantial residential projects, typically between £150,000 and £750,000: house extensions, complete refurbishments and larger bespoke joinery packages as part of a full project.

Do I need drawings or planning permission before I contact you?

It helps if you already have architect's drawings or planning in place, and we are happy to price projects from your drawings. If you are earlier in the process, tell us where you are and we will talk it through at your consultation.

How much does a house extension or full renovation cost?

Every project is different, so we never guess a price over the phone. Your complimentary consultation gives us what we need to understand the scope and give you a clear, considered figure.

Do you manage the whole project?

Yes. We manage entire projects from start to finish, including the structural work, the build and the bespoke carpentry and joinery, so you deal with one team throughout.

Which areas do you cover?

London and the South East, including Surrey and Kent.

What happens at the private consultation?

We talk through your plans, drawings, timings and budget, and explain how we would approach the project. There is no charge and no obligation.

How long have you been established?

MSJ Contracts is a family-run business established in 1993.

Your next step

Planning a house extension or renovation in London?

Arrange a complimentary private consultation with a family firm that has been crafting exceptional homes since 1993.

Tap to callFree consultation