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FAQ

Frequently Asked Questions - JT Allen

General Questions

What areas does JT Allen cover in South East London?

We provide building services throughout South East London, with a primary focus on Dulwich, Greenwich, Blackheath. We also serve Lewisham, Peckham, Camberwell, Forest Hill, Sydenham, Catford, Hither Green, Brockley, Deptford, New Cross, Honor Oak, and surrounding areas within a 10-mile radius.

JT Allen has been serving homeowners in South East London for over 35 years. We’ve completed hundreds of loft conversions, house extensions, and renovation projects throughout the area.

Yes. JT Allen carries comprehensive public liability insurance (£2M) and employers liability insurance (£5M). All our tradespeople hold relevant qualifications and certifications. Insurance certificates available on request.

Yes, we offer completely free, no-obligation quotes for all building projects across Dulwich, Greenwich, Blackheath and surrounding areas. We’ll visit your property, discuss your requirements, and provide a detailed written quote.
We provide comprehensive guarantees on all work: 10-year structural guarantee on extensions and loft conversions, 5-year guarantee on kitchen and bathroom installations, 2-year guarantee on general building works.

Loft Conversion Questions

Do I need planning permission for a loft conversion?

Most loft conversions fall under Permitted Development and don’t require planning permission, provided you stay within volume limits and don’t alter the roof height significantly. Planning permission may be needed if your property is in a conservation area, you’re planning a mansard conversion, or you want to extend beyond permitted allowances. We advise during our free survey.

Loft conversion costs vary based on size and type:

  • Velux (roof light) conversion: £30,000 – £45,000
  • Dormer conversion: £45,000 – £75,000
  • Hip-to-gable conversion: £60,000 – £85,000
  • Mansard conversion: £70,000+

Every home is different. We provide detailed, itemised quotes.

Most loft conversions take 6-10 weeks from start to completion, depending on complexity. Dormer and hip-to-gable conversions typically take longer than Velux conversions.

Yes. A professionally completed loft conversion typically adds 15-25% to property values in South East London, particularly where extra bedrooms increase market appeal.

House Extension Questions

How much does a house extension cost in South East London?

Extension costs depend on size, specification and complexity:

  • Single-storey rear extension: £1,800 – £2,500 per sqm
  • Side return extension: £2,000 – £2,800 per sqm
  • Two-storey extension: £2,200 – £3,000 per sqm
  • Wraparound extension: £2,000 – £2,800 per sqm

Costs include all building work, but kitchen/bathroom fit-out is additional.

A single-storey rear extension typically takes 10-14 weeks. Two-storey extensions take 14-20 weeks. Weather and planning factors can affect timelines.

Many extensions fall under Permitted Development, but this depends on size, position, and whether your home has been extended before. Conservation areas have stricter rules. We check this during our free consultation.

Kitchen & Bathroom Questions

How long does a kitchen installation take?

A full kitchen renovation typically takes 2-3 weeks for the installation phase. This includes removing the old kitchen, any structural work, plumbing, electrics, fitting, tiling, and finishing. We can usually keep part of your kitchen functional during the work.

A complete bathroom renovation typically takes 1-2 weeks. This includes removing the old suite, any plumbing changes, tiling, fitting the new suite, and finishing work.

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Ready to start your project? Contact JT Allen for a free, no-obligation consultation.

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