Know exactly what your extension will cost before you commit
Every Parker Grears extension is priced from an independent QS takeoff of your drawings, so there are no vague quotes and no surprises halfway through. One FMB Approved principal contractor from first drawing to final coat, building across Nuneaton, Bedworth, Hinckley, Coventry, Rugby and the wider Midlands.
- FMB Approved
- 5 year workmanship guarantee
- Rated 5.0 on Google
Double storey extension, Nailstone
- FMB Approved
- £5m public liability insurance
- 5 year guarantee, optional 10 year insurance backed
- Free, no obligation consultation
What an extension really costs in 2026
Honest ranges, including VAT, so you can see where your project is likely to sit before we price it properly.
Single storey extension
A 15 to 25 m² rear or side extension, including VAT. Most kitchen diners sit here.
Find out more →Larger single storey or wraparound
25 to 40 m² of new ground floor space, often with bifolds, roof lanterns and a knock through into the existing house.
Find out more →Double storey extension
Two floors, 40 to 60 m² in total, typically a kitchen diner below and a bedroom with en suite above.
Find out more →Figures include VAT and cover the building work finished to a good standard. Kitchens, bathrooms, bespoke glazing and landscaping are priced separately as provisional sums so you can see them. They are a realistic planning range, not a quote: your number comes from your own drawings and an itemised breakdown. See our project investment guide for the full picture.
Why the price is real
Nobody signs anything until the price is real. Every stage is a small step, so you are never asked for a big commitment on a vague number.
One contractor, one point of responsibility
Parker Grears is the principal contractor on your project: our own people alongside established specialist trades, with Sean and Paul running the site. You deal with us and nobody else.
The price is real before you commit
A written budget first, then an independent QS takeoff of the final drawings, then a fixed quotation built from it. No vague quotes and no surprises halfway through.
A schedule every week
You get a programme at the start of each week and both directors’ mobile numbers. Our clients tell us this is the difference they notice most.
Built to be checked
FMB Approved, £5m public liability cover, SMSTS site management and CSCS carded teams. Every project signed off by building control.
How a project runs with us
Nobody signs anything until the price is real. Every stage is a small step, so you are never asked for a big commitment on a vague number.
Free consultation and budget
We visit, look at the property and talk through what you want. You get a written budget range built from your ideas or early drawings, at no charge.
Design and approvals
If you need drawings we introduce architects we trust, then handle planning, building regulations and the structural engineer with them.
Independent QS takeoff
Before the price is fixed we recommend an independent quantity surveyor measures the final drawings line by line. It costs £240 plus VAT, refunded in full if you appoint us, and you keep the document either way.
Fixed quotation and contract
The agreed takeoff becomes the project budget. You get a fixed quotation built from it, a written contract and stage payments tied to progress, never paid ahead of the work.
The build
One point of contact, a schedule at the start of every week, both directors’ numbers, and any change agreed in writing before it happens. Sites are kept clean for you and your neighbours.
Handover and guarantee
Building control sign off, certificates and a 5 year workmanship guarantee as standard, with an optional 10 year insurance backed guarantee available.
Recent extensions across the county
What homeowners say
Every review below is a real, named Google review. Rated 5.0 on Google. Read them all on Google.
“At the start of each week we were given a schedule and that’s what happened, no false promises made. Their attention to detail, costs, and timing was just right, it felt like they were doing the work on their own properties they took so much care.”
“Sean and Paul took control of every minor detail so that we could sit back and relax. Even with the roof being lifted off the house, minimal disruption occurred. Further structural work was uncovered during the build and dealt with accordingly without impacting the final budget.”
“We had a new extension and kitchen and the whole project totally surpassed our expectations. Everything was done to a very high standard from start to finish. Sean and Paul were great with every detail of the project no matter how big or small.”
Before you ask
What does an extension really cost in Warwickshire in 2026?
Most 15 to 25 m² single storey extensions we build come out between £50,000 and £80,000 including VAT, larger single storey or wraparound extensions between £80,000 and £130,000, and double storey extensions between £110,000 and £175,000. Kitchens, bespoke glazing and landscaping are priced separately so you can see them. Your figure comes from your drawings and an itemised breakdown.
What is a QS cost plan and why does it matter?
A quantity surveyor measures your final drawings line by line and prices every item, so the quotation is built from measured quantities rather than allowances. We recommend an independent QS takeoff before the price is fixed: £240 plus VAT, refunded in full if you appoint us, and you keep the document either way. It is the best protection you have against a budget that drifts.
Which councils do you work under?
Nuneaton and Bedworth, North Warwickshire, Rugby, Warwick District, Coventry City, Solihull, Hinckley and Bosworth, Harborough, Tamworth and North West Leicestershire. We handle the application with your architect whichever it is.
Do I need planning permission?
Many single storey rear extensions fall within permitted development. Double storey extensions, large side extensions and anything in a conservation area, on a listed building or in the Green Belt usually need a full application. We check your address before any design work starts.
How long does an extension take?
Typically 10 to 14 weeks on site for a single storey extension and 16 to 22 weeks for a double storey, plus design and approvals before that. You get a written programme with the quotation and a schedule at the start of every week.
What guarantee do you give?
A 5 year company workmanship guarantee as standard, with an optional 10 year insurance backed guarantee available on all completed work.
Other ways we add space
Parker Grears is the principal contractor on every job: our own people alongside established specialist trades, with one point of responsibility for the site, the programme and the finish.
Towns we build in
We are based in Nuneaton and work across Warwickshire, Leicestershire and the wider Midlands. Most of our projects are within forty minutes of the yard, which keeps the same people on your site from the first day to the last.
Tell us about your extension
Call, WhatsApp or send the form. Sean or Paul will come back to you within one working day, and the first conversation is always free and without obligation.
024 7518 5349- Message us on WhatsApp
- info@parkergrears.com
- 47 Northumberland Avenue, Nuneaton CV10 8ER
- Monday to Saturday, 9am to 5pm
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