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Home Extensions Milton Keynes

Extensions specialists helping homeowners in Milton Keynes and surrounds, create more space and add value, for over 20 years.

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Extension Builders in Milton Keynes

HBB are local builders in Milton Keynes who specialise in helping homeowners add new space and value to their property. We focus on providing a high-quality build which also offers great value for money. Our accomplished team have the ability and aptitude to ensure modern house extensions are completed exactly how you envisioned, and the quality craftsmanship we produce is the fundamental aspect which sets us apart from the crowd. 

We specialise in house extensions Milton Keynes and surrounds. If you have not yet designed your new extension our architects are able to take care of the necessary steps regarding your planning permission approval and building regulations application.

Once this stage is completed it will be time for you to become much more ‘hands on’ building an extension, as we discuss the finer details of your building and extension, including which materials will work best within your property and the exact look and feel you are aiming to achieve once your project is complete.

Whether it’s a side aspect extension, kitchen extension or a full double-storey extension, HBB can effectively manage each stage of the works ensuring your extension is completed on time and on budget. We are committed to client satisfaction which means we are not happy until your new space exceeds your expectations and you can’t wait to begin utilising it.

With Milton Keynes property extensions being one of our most popular services we are sure you will find our knowledge and expertise invaluable when it comes to planning and designing your project. Bi-folding doors which span the full width, and Velux roof lights to allow the maximum amount of light into your property are just some of the suggestions we will provide. We take care of all groundworks, hard landscaping, plumbing, electrics, plastering and painting. 

An extension is an excellent way of adding value to your property, but the extra space it creates should also improve many aspects of your lifestyle. Our attention to detail will help you to achieve a seamless finish between the old and new areas of your property.

Commission HBB – builders Milton Keynes, to complete your building work and watch our skills, commitment and dedication come into full effect. We are home extension specialists when it comes to this type of work we get just as excited to see the end result as our clients do. Get in touch for a free consultation


Latest Google Reviews

Great job. Phill is extremely courteous and happy to help in any way.

Terry Bennett Avatar Terry Bennett

Professional job done on out side wall.. new bricks plus pointing.. done such a good.. Put our minds at ease.. thankyou HBB

lisa mapp Avatar lisa mapp

Had Phil and his son come to build a retaining wall in my front garden. They have done an excellent job so professional two great people very polite on time... read more

Sheila Graham Avatar Sheila Graham


Frequently Asked Questions

This is a common question in the Milton Keynes, UK area, but it’s not always easy to answer. 

The short answer is yes. You will need to go through the planning process, especially if you’re adding an extension to your home or even if you’re adding on a porch or deck. There are many things that influence whether you’ll need planning permission or not: location, size, and style of the extension (like whether it’s a conservatory or porch) are some of them.

If you’re thinking about getting work done on your home extension in MK, it usually helps to get an expert opinion first. Our contractors can tell you whether you need planning permission for the work you want done, so give us a call before you start!

The average extension cost in Milton Keynes, UK, is anywhere from £25,000 to £60,000. Kitchen extensions can differ. However, that range can differ depending on several factors—location and size of the home being extended, materials used for construction, etc.

The short answer is, it depends. Yes, if you’re building a single-story extension your home will fall under permitted development rights. If you’re building a two-story extension, you may need to apply for planning permission. 

In England and Wales, extensions that add more than 40 square meters (430 square feet) to a property are not permitted development. Exact details about what counts toward the threshold vary by property type. For example, an extension of 30 square meters (325 square feet) or less is always permitted development in a detached house or bungalow, but only if it does not encroach on any boundary with land owned by someone else.

Permitted Development Rules

An extension of more than 30 square meters is only permitted development if all of your neighbors have consented to the works being carried out. In the case of semi-detached houses and terraced houses, an extension of up to 60 square meters (645 square feet) is permitted development without needing to get consent from your neighbors, but again it must not encroach on any boundary with land owned by someone else.

In most cases, you will not need to hire a structural engineer to extend your home—however, it is a good idea to consult one.

The best time to consult a structural engineer is before you submit your planning application, so they can advise you on how best to proceed.

When working with HBB, you won’t need to hire a structural engineer to extend your home. Our team will handle all of the engineering involved in extending your home, and we’ll work with you to ensure that your extension is safe and as exactly what you had in mind.

One of the most common questions homeowners have after they’ve decided to add an extension is, “How much will it cost?” While there are certainly variables that affect the cost of a project, we’ve done some research to find some averages. 

The average cost of a single story house extension in the United Kingdom is roughly £18,000.

Factors to Consider

The cost will depend largely on the type of materials used, the size of the project, and the time it will take to complete.

The materials will include any traditional items used for building construction such as cement, wood, and nails, as well as any modern additions such as insulation or special glass.

Yes, you will need to hire an architect for a property extension.

An architect will design the extension to your property and then draw up plans that can be submitted to the local authority for approval. Generally, you will only need to hire an architect if you are planning on extending your house in any way beyond the existing structure.

Further Guidance on Architects

If you just want to add a room onto the side of your house and keep the layout of rooms similar to what they currently are, you can get by with hiring a builder only. If you want to completely change the footprint of your home, or alter the layout of rooms significantly from what they are now, then you will need to hire an architect as well.

When you work with HBB, we can take care of all the necessary architectural plans and drawings.

The answer to this question can vary quite a bit, because it depends on the location of your home, the type of extension you want to build, the materials you choose for it, and more. As we’re sure you know, an addition that is purely aesthetic and does not add any new features or rooms will cost less than an addition with new bedrooms or bathrooms.

Examples of Extension Costs

For instance, a small extension costing £15,000 could add £15,000 to the value of your home. A larger addition costing £75,000 might only see a value increase of £50,000. 

But if you’re looking for a rough estimate, then you should know that an average extension adds about 20% to the value of your home in Milton Keynes. This is based on recent data from the UK House Price Index.

HBB are a local Milton Keynes builders who provide residential building and construction work throughout Milton Keynes and all surrounding areas.

  • Milton Keynes
  • Newport Pagnell
  • Buckingham
  • Olney
  • Woburn Sands
  • Cranfield
  • Winslow

See the map below for more details.