PDDartford · Rear extension
Dartford: extension rescue and compliance reset
Rescued rear extension + compliance reset. PD route. 14 weeks.
View full project →Maven Design & Build
Your extension or renovation — designed, approved, and built with care.
See real project outcomes, understand your planning route, and work with a team that stays with you from first visit to finished rooms across Essex, Kent and London.
Start here
What are you planning?
Tell us your project type — we will show the right examples, route advice, and next step.
Our work
Before and after — the quality of delivery you can expect
Every pair shows the same property transformed. Toggle before and after to see the scope we deliver — extensions, lofts, renovations and garden rooms.
PD
LDCBromley · Loft conversion
Loft dormer in Bromley (LDC for certainty)
Loft dormer with ensuite. LDC route. 12 weeks.
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PLANNINGChelmsford · Loft conversion
Bungalow loft in Chelmsford (planning route)
Bungalow loft conversion. Planning route. 18 weeks.
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PDIlford · Garage conversion
Garage conversion in Ilford (Permitted Development)
Warm living room from garage. PD route. 8 weeks.
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PDEssex · Garden room
Garden room in Essex (Permitted Development)
Detached garden office. PD route. 6 weeks.
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PDColchester · Loft conversion
Hip-to-gable loft in Colchester (Permitted Development)
Hip-to-gable loft conversion. PD route. 10 weeks.
View full project →Reviews
What clients say
Scores and quotes from Checkatrade (below) and Google. Open each platform for the full history.
Google
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Checkatrade
9.92/ 1013 reviews
Vetted trade platform — all reviews on our public profile.
Checkatrade10/10
Amazing result work for my house extention !!!
We recently completed a house extension and are very happy with the results. The work was done to a high standard, finished quickly, and stayed within budget. We also received the final Building…
March 2026
Checkatrade9.67/10
Excellent House Renovation
We recently had our house renovated at Victoria avenue, Southend on sea and very satisfied with Maven team. Everything was explained clearly and done as promised, also on given time frame. We are…
January 2026
Checkatrade10/10Verified
Side extension
We're very pleased with Maven Design and Build for our triangular extension with a flat GRP roof. The project was completed on time and met all our expectations. We'd happily recommend them to anyone.
June 2025
Why homeowners choose us
Everything you need to decide with confidence
Extending or renovating is a big decision. We remove guesswork on route, cost band, programme and finish quality — then deliver.
Planning clarity first
We map PD, LDC, prior approval or full planning against your plot before you spend on the wrong drawings.
Design that builds cleanly
Details, structure and services are coordinated early — so site work is sequenced, not improvised.
Managed delivery
One accountable team for programme, quality checks and communication — with a client portal for progress.
Verified trust
Checkatrade-rated work with homeowners who stayed informed from survey through Building Control.
Services
The work homeowners come to us for
Whether you need advice only, design through approval, or full design-and-build — we keep route, drawings and site delivery aligned.
Most requested
Home extensions
Rear, side and wraparound extensions with planning route clarity, structural coordination and a finished kitchen-diner you can live in.
Extra space upstairs
Loft conversions
Dormers and hip-to-gable lofts with volume, stairs and Building Control handled properly — bedrooms and ensuites that feel like part of the home.
Whole-home quality
Renovations
Structural openings, kitchens and full remodels sequenced with clear communication — standalone or alongside an extension.
Already have planning? See our build-only route →
How it works
A clear path from first conversation to completion
Already have planning? We can pick up at detailed design or go straight to build — no unnecessary steps.
- 01
Consultation
We talk through your brief and site — and agree how much certainty you need before you pay for full design.
- 02
Route check
We match your project to PD, an LDC, prior approval, or full planning — and say plainly where local rules or the plot changes the answer.
- 03
Design & prep
Surveys, drawings, specs, and building control input — so approvals line up with what can be built.
- 04
Build
Managed programme on site: quality checks, tidy sequencing, and regular updates — extensions, lofts, renovations, and structural work.
Free planning check
Not sure if your project is Permitted Development?
Answer a few questions about your home and proposal. We will flag whether PD, an LDC, prior approval, or full planning is the safer path — before you spend on the wrong drawings.
- Takes about two minutes
- Honest risk flags for Article 4, conservation and prior approval
- Clear next step: book a consult or explore our work
Could your project use Permitted Development?
Answer a few questions. We will show whether PD looks possible, or if full planning is more likely — before you spend on drawings.
Prefer to talk first? Call 07721 026126. Or book a timed session on the Book page.
Free homeowner tools
Plan before you commit spend
Practical estimators for route, budget and programme — then talk to us when you want a real quote.
PD Quick Check
See whether your extension or loft is likely Permitted Development — or needs planning.
Open tool →Extension cost estimator
Get an indicative UK cost range by size, project type and finish level.
Open tool →Build timeline planner
Map a realistic week-by-week programme from design through handover.
Open tool →Insights
Clear answers before you build
Cost ranges, planning routes, loft types and build programmes — written for homeowners, citeable by search and AI assistants.
Ready to get your extension or renovation done properly?
Book a consultation, check your planning route, or call us. We will show you the lawful path, a realistic programme, and the finish quality our clients expect.