Grimsby, Lincolnshire
Glazed rear extension in Grimsby
Thinking about a glazed rear extension in Grimsby? Full-height glass, slim frames and big rooflights for the most open rear room. Our team handles the drawings, the planning route and the build, and your contract is with one company throughout.
Grimsby is covered from our Lincolnshire round, including DN31, DN32 and DN34. A wide sliding door with one long rooflight, rather than a fully glazed roof, keeps a glass-led extension usable in summer.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a glazed rear extension cost in Grimsby?
For Grimsby we work from the East Midlands rate: £2,720–£4,660 per square metre of new floor, including VAT, standard specification. East Midlands prices sit a little below our West Midlands baseline.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £32,500–£56,000 |
| 4 m wide × 6 m deep (24 m²) | £65,000–£111,500 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a glazed rear extension in Grimsby?
Whether your glazed rear extension in Grimsby needs a planning application depends on its size, your house and any local restrictions.
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres within 2 metres of a boundary.
New fabric must meet Approved Document L (2021 edition incorporating 2023 amendments): walls 0.18, roof 0.15 and floor 0.18 W/m²K, windows 1.4 W/m²K or Band B. Under the simple route, new windows, doors and rooflights should not exceed 25% of the extension floor area plus any openings removed; more glass is possible with a whole-house calculation.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Grimsby like to extend?
Grimsby has plenty of inter-war semis and bungalows, and single-storey rear extensions suit both.
How a glazed rear extension in Grimsby comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Glazed rear extensions near Grimsby
Close by, we work in Cleethorpes, about 1.8 miles away, and Immingham, about 6.7 miles away.
- Glazed rear extension in Cleethorpes
- Glazed rear extension in Immingham
- Glazed rear extension in Hedon
- Glazed rear extension in Louth
- Glazed rear extension in Kingston upon Hull
Other work in Grimsby:
FAQ
Glazed rear extension questions in Grimsby
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
How much does a glazed rear extension cost in Grimsby?
As a guide, £2,720–£4,660 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £32,500–£56,000 at that rate. Your written price follows the survey.
Is a glass box a conservatory?
No. It is built to Building Regulations as part of the house, with insulated floor and roof, so it is usable all year.
How long does a rear extension take to build in Grimsby?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Is the site visit in Grimsby free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Can you match the brick or stone on my Grimsby house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.