How much does a loft conversion cost in Cambridge? (2026 guide)

Most loft conversions in Cambridge cost between £45,000 and £70,000 in 2026. The final figure depends on the type of conversion, the size of the space, how much structural work is involved and the finish you choose. This guide breaks the cost down by type, walks through a real Cambridge example and explains what pushes the price up or down.

If you are planning a loft conversion in Cambridge, the honest answer is that no two projects cost the same. A straightforward rooflight conversion in a modern semi is a very different job from a mansard on a Victorian terrace near the city centre. The guide figures below give you a realistic starting point before we visit.

What affects the cost of a loft conversion?

Two lofts of the same floor area can cost very different amounts. The main factors are:

• Type of conversion. A Velux or rooflight conversion is the cheapest because it keeps the existing roof. A mansard is the most expensive because it rebuilds it.
• Structural work. New steel beams, a strengthened floor and any changes to the roofline are some of the biggest costs on the job.
• Size and head height. More floor area costs more, and any work to gain head height adds to the bill.
• The staircase. Where the new stairs land, and any knock-on changes to the floor below, affect both cost and time.
• The finish. A simple bedroom is far cheaper than a suite with an en-suite bathroom, built-in wardrobes and bespoke joinery.
• Access and services. Moving a water tank, rerouting services, or tight rear access in a terraced street all add labour.

Loft conversion cost by type in Cambridge

As a guide, costs rise with the amount of structural work involved:

These are guide figures for a good-quality conversion including design, structural work and a finished room. We confirm exact costs after a free site visit.

A worked example: a Cambridge semi

Take a typical 1930s semi-detached house in a suburb such as Cherry Hinton or Trumpington. The owners want an extra double bedroom with an en-suite, so a rear dormer gives them the head height and floor space they need. A rough breakdown might look like this: design, drawings and structural engineering around £4,000 to £6,000; the dormer structure, steels and new floor around £22,000 to £28,000; windows, insulation, the staircase and first fix around £12,000 to £16,000; then plastering, second fix, the en-suite and decoration around £12,000 to £16,000. That lands the project in the mid to upper £50,000s, in line with the dormer guide above.

Extra costs to budget for

• Architectural drawings and a structural engineer.
• Planning fees, if your conversion needs permission rather than falling under permitted development.
• A party wall agreement, which is common on terraced and semi-detached homes in Cambridge.
• VAT, and any upgrades such as a bathroom, extra rooflights or bespoke storage in the eaves.

Is a loft conversion good value in Cambridge?

Cambridge has some of the highest property prices in the country outside London, and space is at a premium. That is exactly why loft conversions are so popular here. Adding a bedroom and bathroom in the roof is usually cheaper per square metre than moving, and it avoids stamp duty and estate agent fees. For many families the sums add up long before resale value is counted, and a well-built loft often returns much of its cost in added value. We cover this in detail in our guide on whether a loft conversion adds value.

Location within the city matters too. Homes in conservation areas or close to listed buildings can need higher-specification materials and extra design work, which adds cost. Terraced streets with no rear access can mean materials are carried through the house, adding labour. We factor all of this into the quote after seeing the property.

Loft conversion or moving house?

For a lot of Cambridge families the real question is not just the cost of the loft, but whether to convert or move. Moving to a larger home in the same area means paying stamp duty, estate agent fees, legal costs and removal costs, which together can run well into five figures before you have gained a single extra room. Buying a four-bedroom house in a sought-after Cambridge suburb also costs far more than adding a fourth bedroom to the three-bedroom home you already own. When you set the £45,000 to £70,000 cost of a conversion against those numbers, and add the disruption of moving, converting the loft is often the cheaper and less stressful route to the space you need. It also lets you stay in the school catchment, street and community you already know.

How to get an accurate price

The only way to know the real cost is a proper survey. Camacre visits your home, checks the roof space and head height, and gives a clear, itemised quote with no hidden extras, so you know the full price before any work begins. It also helps to plan around the practical side first: how long the work takes, whether you need planning permission, and which type of conversion suits your roof and budget.