Extensions in Coulsdon
Strata Build designs and builds house extensions, loft conversions and full refurbishments for homeowners in and around Coulsdon. Whether you're on one of the town's wide-plotted 1930s semis or a more recent build near the station, we manage the project from first survey through to building control sign-off.
Coulsdon has a genuinely different planning picture to some neighbouring areas. Parts of the town sit within a conservation area, and Croydon Council also applies an Article 4 Direction here that removes some permitted development rights homeowners might otherwise rely on.
We check your specific address before assuming what you can and can't do. We cover extensions, loft conversions and property refurbishments as one team, so if your project involves more than one of these, we plan and build it together rather than passing you between separate contractors.
Choosing Extensions in Coulsdon
How much does a house extension or loft conversion cost in Coulsdon?
For most Coulsdon semis with deep gardens, a single-storey rear extension or a hip-to-gable loft conversion tends to suit the property style best, though the right choice depends on your garden space, budget and planning route.
Can I extend my Coulsdon home without full planning permission?
Wide-plotted 1930s semis suit rear extensions and hip-to-gable loft conversions particularly well, while properties with less garden space often do better focusing on a loft conversion alone.
How quickly can I get a quote for my project?
We offer a free site visit and no-obligation quote, and can give you a clearer figure once we've assessed your property and confirmed the planning route that applies to your address.
Will I need a party wall agreement for my project?
Very likely, if your house is semi-detached or terraced (as most are in Coulsdon) and the work comes within 3 metres of a shared wall or boundary.
This applies to most loft conversions and side extensions here, and we manage the process as part of the build.
Extension, loft conversion and refurbishment services near you
Every service below is available in Coulsdon. Use the cards to jump to the local detail or open the full service page.
House Extensions
We design and build single and double-storey extensions suited to Coulsdon's wide-plotted 1930s semis and deep rear gardens.
House Extensions in Coulsdon ↓Loft Conversions
Hip-to-gable and rear dormer loft conversions for Coulsdon's common hip-roofed semi-detached houses, from initial design through to sign-off.
Loft Conversions in Coulsdon ↓Property Refurbishments
Full property refurbishment for Coulsdon homes, covering plumbing, electrics, flooring and finishes alongside any extension or loft work.
Property Refurbishments in Coulsdon ↓Extensions for Coulsdon
Extensions remain the most popular way to add space in Coulsdon, especially single-storey rear builds that suit the deep gardens common on 1930s semis. Where you want a larger footprint, double-storey extensions and side returns are also common, though these usually need a full planning application rather than relying on permitted development alone.
Loft conversions work well as an alternative where garden space matters more to you than an extension footprint. Hip-to-gable conversions suit the hip-roofed semis found throughout the town, while rear dormers offer another route depending on roof shape and how much extra space you need.
Property refurbishment sits alongside both services for homeowners tackling a fuller renovation, whether that's reworking layout, updating plumbing and electrics, or bringing an older property up to a modern standard while keeping period features intact.
Extensions options at a glance
| Hip-to-gable loft conversion | 1930s hip-roofed semis common across Coulsdon | Squares off the roof for significantly more headroom than a rooflight-only job |
|---|---|---|
| Rear dormer loft conversion | Properties needing maximum extra floor space in the loft | Suitability depends on existing roof shape and planning route |
| Single-storey rear extension | Wide-plotted semis with deep gardens | Often achievable under permitted development, subject to your address |
| Double-storey rear or side extension | Larger space requirements across two floors | Usually needs a full planning application and structural steel |
Extensions costs in Coulsdon
Loft conversions in the Coulsdon area typically run from around £35,000 to £65,000, depending on the conversion type, size and any layout changes involved. Extensions vary more widely: a small single-storey build can start from around £21,000, while a large double-storey extension with structural steel and higher-spec finishes can reach £95,000 or more.
These figures are a guide rather than a quote, since roof type, storey count, structural work and finish level all affect the final price. A free site visit lets us give you a proper figure for your specific project.
| Service | From price | Benefits |
|---|---|---|
| Small single-storey extension | From £21,000 | Adds usable space without the scale of a full rebuild |
| Large double-storey extension | From £95,000+ | Delivers significant extra floor space across two storeys |
| Loft conversion | £35,000–£65,000 | Adds a room without reducing garden space, well suited to hip-roofed semis |
What affects the cost?
- Small single-storey extension: Size, structural work and finish level affect final cost
- Large double-storey extension: Includes more structural steel and typically a full planning application
- Loft conversion: Varies by conversion type, size and layout changes
From enquiry to completed work
Free site visit and survey
We visit your Coulsdon property to assess the space, discuss what you want to achieve, and check the planning position for your specific address.
Design and planning route
We develop concept designs and advise whether your project falls under permitted development, needs prior approval, or requires a full planning application.
Party wall and building regulations
Where work comes within 3 metres of a shared boundary, we handle the party wall process alongside structural calculations and building control applications.
Construction
Our team carries out the build, keeping you informed at each stage and managing subcontractors such as plumbing and electrics as needed.
Sign-off and aftercare
Once building control confirms the work meets regulations, we provide guarantees and remain available for any snagging.
Extensions FAQs for Coulsdon
My house is a 1930s semi with a hip roof, what are my loft options?
This is one of the most common house types in Coulsdon, and it's well suited to a hip-to-gable conversion, which squares off the roof to create significantly more headroom and floor space than a Velux-only conversion.
What happens if my extension needs a structural engineer?
Anything beyond a simple single-storey extension or rooflight loft usually needs structural calculations and building control sign-off. We arrange this as part of managing your project so it's built into the timeline from the start.
Do you handle both a loft conversion and a rear extension on the same project?
Yes, a loft conversion paired with a rear extension is a common project type for houses of this age and layout, and we can manage both together as one build.
What does building control sign-off actually mean?
It confirms the completed work meets current building regulations for structure, fire safety, insulation and more. We handle the building control process and aftercare so you have a clear record the work has been properly signed off.
Is my Coulsdon property in a conservation area?
This varies by street and needs checking against the council's own records rather than assumed either way. We'll confirm this for your specific address before finalising a planning route.
Is my Coulsdon property in a conservation area or Article 4 zone?
This varies by street and needs checking against Croydon Council's own planning map rather than assumed either way. We'll confirm this for your specific address before finalising a planning route.
Will my property near Farthing Downs or Happy Valley have extra restrictions?
Possibly, if you're on the town's southern edge near this Green Belt and nature reserve land. Most residential streets in the main built-up area aren't directly affected, but it's worth checking if your property backs onto or sits very close to it.
What's the difference between standard permitted development and the larger home extension scheme?
Standard permitted development allows a smaller rear extension without prior approval, while the larger home extension scheme allows more depth on attached houses subject to neighbour consultation.
Which applies to your property depends on its exact location, so we check this before designing your extension.
Areas we cover near Coulsdon
Local areas around Coulsdon
Book a free site visit in Coulsdon
Get in touch for a free site visit and no-obligation quote for your extension, loft conversion or refurbishment project. We'll assess your property, check the planning position and talk through the options that suit your home.