Add the postcode for your project so the results are accurate (you'll need to do this later anyway!)
Extensions / Conversions in Thamesmead (180)
Search results
Describe your job
Give us the details of your job and we'll send it to specialist trades for you
Describe your job
Receive multiple quotes for your job from reviewed and trusted tradespeople
- Sponsored
Services & skills
BuilderExtensions / ConversionsBrick / Concrete Structural RepairsGeneral BuildingLoft Conversions Services & skills
BuilderExtensions / ConversionsLoft ConversionsSteel FabricationNew BuildsServices & skills
BuilderExtensions / ConversionsInsurance Claim SpecialistEmergency Builder ServiceLoft ConversionsServices & skills
BuilderExtensions / ConversionsEmergency Builder ServiceNew BuildsGeneral BuildingServices & skills
BuilderExtensions / ConversionsPartition WallsConcrete GaragesSustainable ConstructionServices & skills
BuilderExtensions / ConversionsCar PortsLoft ConversionsConcrete Garages- L
Services & skills
BuilderExtensions / ConversionsBasement / Cellar ConversionsGarage ConversionsRefurbishments Services & skills
BuilderExtensions / ConversionsCar PortsWall Tie ReplacementsGarden StudiosServices & skills
BuilderExtensions / ConversionsConcretingBrick / Concrete Structural RepairsEmergency Builder ServiceServices & skills
BuilderExtensions / ConversionsMastic SealantRefurbishmentsWorkshop Design / ConstructionServices & skills
BuilderExtensions / ConversionsNew BuildsGarage ConversionsBrick / Concrete Structural RepairsServices & skills
BuilderExtensions / ConversionsNew BuildsLoft Conversions
Top rated Extensions / Conversions in Thamesmead
10
/10
66 ratings
Our Extensions / Conversions in Thamesmead are rated an average of 10 out of 10 based on a sample of 66 reviews from customers like you*
*This review aggregate is based on real customer reviews from a randomly selected postcode in this area
Conversion and extension builders in Thamesmead
Planning a loft conversion, garage makeover or full house extension in Thamesmead? You’re in the right place. Whether you’re adding space for a growing family, upgrading your layout or increasing your home’s value, we can help you find the right tradesperson for the job.
Find extension and conversion builders in Thamesmead
Every builder on Checkatrade passes up to 12 checks before they appear in your search. You can read verified reviews, compare services, and even post your job to get quotes straight to your inbox, all in a few clicks. That’s how we help homeowners like you get a job done right.
What to expect from hiring an extension or conversion builder in Thamesmead
Our checked tradespeople in Thamesmead cover a wide range of projects, including:
Single or double-storey house extensions
Kitchen and diner extensions
Loft, attic, garage or basement conversions
Garden room extensions
Utility room extensions
Over-garage extensions and side returns
Extension and conversion build costs in Thamesmead
Costs of extensions and conversions vary depending on size, structure and spec, but here's a rough guide:
Extensions:
£32709 on average, with prices typically starting at £20085 up to £52106.
Loft conversions:
£35928 on average, with prices typically starting at £23495 up to £54370.
Garage conversions:
£11307 on average, with prices typically starting at £7931 up to £16168.
Conservatory roof conversions:
£8088 on average, with prices typically starting at £5783 up to £11360.
Need help calculating costs? Use our Job Value Estimator Tool for a bespoke cost estimate.
What to check before you hire:
- Are drawings or planning permissions needed?
- Are they familiar with building regs?
- Is the quote fixed or flexible?
- Does it cover materials and project management?
Most builders will include prep, construction, electrics, plumbing and final finishes in their quote, but always double-check. Timelines range from a few weeks for simple jobs to several months for bigger builds.
Extension and conversion builders in Thamesmead: Homeowners vs renters
Homeowners:
You’re in charge of the project. That means hiring the builder, securing permissions, and paying for the work. You may need:
Planning permission (especially for double-storey builds or changes near boundaries)
Drawings from an architect or structural engineer
Building regs approval
If you’re not sure where to start, speak to a local builder or post your job to get help with the process.
Renters:
You’ll usually need your landlord’s approval to make any big changes. In most cases, your landlord will be the one arranging and paying for structural changes like loft conversions or extensions. That said, it’s worth flagging ideas if you think they’ll improve the property, especially if it means longer tenancies or fewer repairs.
Emergency extension or conversion help in Thamesmead
Extensions and conversions are big projects, but sometimes, things go wrong and need sorting fast. Common urgent issues include:
Leaks in newly converted lofts
Structural cracks or shifting
Faulty electrics or plumbing in newly added rooms
Incomplete work by previous builders
Facing an emergency in Thamesmead? Enter your postcode or post a job to find emergency services in your area.
Find the right extension or conversion specialist in Thamesmead
Looking for a builder to help with:
- Rear house extensions
- Kitchen extensions
- Garage conversions
- Loft or attic conversions
- Garden room builds
- Basement or cellar conversions
- Conservatory roof upgrades
- Utility or porch extensions
Looking for more tradespeople in Thamesmead?
Find Checkatrade reviewed Tradespeople, get a quote today, discover related services in Thamesmead and check out our latest home improvement guides.
- Builder in Thamesmead
- Wall Tie Replacements in Thamesmead
- Brick Concrete Structural Repairs in Thamesmead
- Concreting in Thamesmead
- General Building in Thamesmead
- New Builds in Thamesmead
- Fire And Flood Renovation in Thamesmead
- Partition Walls in Thamesmead
- Agricultural Building in Thamesmead
- Basement Cellar Conversions in Thamesmead
- Loft Conversions in Thamesmead
- Period Property Restoration in Thamesmead
- Plumber in Thamesmead
- Handyman in Thamesmead
- Gardener in Thamesmead
- Electrician in Thamesmead
- Gas Boiler Servicing Repair in Thamesmead
- Mobile Mechanic in Thamesmead
- Car Repair in Thamesmead
- Builder in Thamesmead
- Painter Decorator in Thamesmead
- Roofer in Thamesmead
- Window Cleaner in Thamesmead
- Carpenter in Thamesmead
- Extensions / Conversions in London
- Extensions / Conversions in Birmingham
- Extensions / Conversions in Newcastle Upon Tyne
- Extensions / Conversions in Bristol
- Extensions / Conversions in Leeds
- Extensions / Conversions in Nottingham
- Extensions / Conversions in Greater Manchester
- Extensions / Conversions in Glasgow
- Extensions / Conversions in Sheffield
- Extensions / Conversions in Liverpool
- Extensions / Conversions in Wirral
- Extensions / Conversions in Coventry
- Plumber in Thamesmead
- Handyman in Thamesmead
- Gardener in Thamesmead
- Electrician in Thamesmead
- Gas Boiler Servicing Repair in Thamesmead
- Mobile Mechanic in Thamesmead
- Car Repair in Thamesmead
- Builder in Thamesmead
- Painter Decorator in Thamesmead
- Roofer in Thamesmead
- Window Cleaner in Thamesmead
- Carpenter in Thamesmead
- Extensions / Conversions in London
- Extensions / Conversions in Birmingham
- Extensions / Conversions in Newcastle Upon Tyne
- Extensions / Conversions in Bristol
- Extensions / Conversions in Leeds
- Extensions / Conversions in Nottingham
- Extensions / Conversions in Greater Manchester
- Extensions / Conversions in Glasgow
- Extensions / Conversions in Sheffield
- Extensions / Conversions in Liverpool
- Extensions / Conversions in Wirral
- Extensions / Conversions in Coventry