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JLS Building & Property Development

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Straight answers to the questions we get asked most on site visits, extensions, renovations, commercial works and facilities maintenance.

Aerial view of the rear of a terraced house showing the garden and neighbouring boundaries

Extensions ·

The Party Wall Act explained: what to do before you build an extension

If your extension touches or sits close to a neighbour's wall, you may need to serve notice. Here is how the process works.

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Aerial view of an extension shell and roof structure at a house in Sandy

Extensions ·

Can you build an extension over winter? What an autumn start looks like

An autumn or winter start can work well if the programme is planned around the weather. Here is how it usually goes.

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Finished rear extension with bifold and French doors onto a garden

Extensions ·

Get a rough price for your extension with our new cost calculator

We've built a calculator that gives you a rough price range in under a minute, built from rates we actually charge, not generic industry averages.

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Bright extension interior with roof skylights and bifold doors open to the garden

Extensions ·

Extend or move? The costs people forget when they compare

An extension looks expensive until you add up what moving actually costs. Here is how to compare the two properly.

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Completed rear extension with bifold and French doors onto a lawn

Advice ·

How to choose a builder in the UK: 10 checks before you sign

Ten checks worth making before you sign anything, from insurance and trade body membership to payment stages and visiting a finished job.

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Facilities Maintenance ·

Planned vs reactive maintenance: what's actually the difference

The real difference between the two, and why most commercial buildings end up needing both rather than picking one.

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Commercial Works ·

What to expect from an office fit-out, start to finish

How a fit-out actually runs from an empty shell through partitioning, electrics and handover, and how to keep it on programme.

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Kitchens & Bathrooms ·

How long does a kitchen renovation actually take?

A realistic week-by-week timeline, and the delivery and access issues that most commonly push a kitchen renovation out.

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Extensions ·

Planning permission for extensions in Bedfordshire, explained

What permitted development actually covers, when you need full planning permission, and how long each route realistically takes.

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Extensions ·

Loft conversion or extension: which adds more space for your money?

Both add a room without moving house. Here's how they actually compare on cost, disruption and the space you end up with.

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Extensions ·

How much does a single-storey extension cost?

A realistic breakdown of what drives the price of a single-storey extension up or down, based on jobs we've actually quoted and built.

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