Planning a House Extension in Essex or Hertfordshire?

Designed and built for homeowners ready to invest in a high-quality, fully managed extension — without the stress or uncertainty.

Most projects typically range from £40,000 to £120,000+

  • Full design and build service managed start to finish

  • Proven projects across Essex and North East London

  • 5 star client feedback

Recent Extension Projects Near You

We have delivered high quality extensions across Essex and surrounding areas, with a focus on clean finishes, strong communication, and reliable delivery from start to finish.

If you are planning an extension like these, the most useful next step is getting a realistic idea of cost, scope, and availability so you can move forward with clarity and confidence.

How We Work

A Properly Managed Extension Done Right First Time

We are not a turn up and build contractor. At LMP Developments, we guide you through the entire process from initial planning and design through to build and completion so nothing is left to chance.

  • Architects and drawings handled for you

  • Planning and building control fully managed

  • Complete project delivery from start to finish including in house trades

This means you get a smooth, well managed build without chasing multiple contractors or dealing with miscommunication.

Project Costs

What Does an Extension Typically Cost?

The cost of an extension can vary significantly depending on the design, size, and level of finish. Most of the projects we complete fall within the £40,000 to £120,000+ range. Simpler builds tend to be at the lower end, while larger, more detailed extensions with structural elements and premium finishes sit towards the higher end.

The quickest way to understand where your project sits is to use the estimator below.

This is a guide for a plastered shell only. Final costs will vary depending on specification, structural work, glazing, kitchens and finishes.

This estimate gives you a realistic starting point. If this is within your expected budget, you can take the next step and see if your project fits our current availability.

Takes less than 60 seconds no obligation

Not Quite Ready Yet?

Still Exploring Your Extension Plans?

That is completely fine. Many of our clients start by exploring ideas before making a final decision.

  • No plans yet? We can guide you through the design and planning process

  • Comparing quotes? We will give you a clear and honest breakdown

  • Not ready to start? We can help you plan the right timeline

If your project is serious and you want it done properly, we are here to help when you are ready.

Real Feedback from Recent Projects

We focus on delivering well managed projects with strong communication and consistent quality. Below are real reviews and video feedback from homeowners who have trusted us with their extensions.

If you are serious about moving forward with your extension, we can review your project and arrange a free site visit to understand your space, requirements, and next steps.

Why Homeowners Choose LMP Developments

We take a more structured and honest approach to building, focused on delivering high quality results without shortcuts or uncertainty.

  • Proven projects across Essex and North East London

  • High quality finishes backed by real client results

  • Full project delivery from design through to completion

  • Personal and transparent communication throughout

  • In house trades ensuring better control and consistency

We are not the cheapest and we do not aim to be. We focus on delivering projects properly, with no shortcuts.

Start Planning Your Extension Properly

If you are serious about moving forward with your extension, we can review your project and arrange a site visit to understand your requirements and next steps.

  • Professional guidance tailored to your home

  • Transparent discussion around cost and scope

  • A clear plan for moving forward