Before
AfterBungalow loft in Chelmsford (planning route)
Bungalow loft conversion. Planning route. 18 weeks.
View project →Build-only
Already have planning? We can build it.
We deliver high-quality extensions, lofts and renovations — with clear management and a strong finish.
Build quality you can rely on
- Structured programme — you know what happens when.
- Quality control on structure, weathertightness, insulation, and finishes.
- Site leadership and clear updates — fewer grey areas.
- We work from approved drawings and flag anything that needs a formal change before we build it wrong.
Types of projects
- Rear, side, and wraparound extensions
- Loft conversions and roof alterations
- Renovations, knock-throughs, and structural alterations
- Finishing packages where the shell is already in place
How we work
- Review your approved drawings and site access.
- Agree specification, programme, and how we communicate on site.
- Build in controlled stages with sign-off where it matters.
- Handover with snagging closed out and documentation you need.
Project gallery
BeforeAfter
Before
AfterDartford: extension rescue and compliance reset
Rescued single-storey rear extension brought back to PD-compliant form. 14 weeks.
View project →
Before
AfterGarage conversion in Ilford (Permitted Development)
Warm living room from garage. PD route. 8 weeks.
View project →What clients say
Recent Checkatrade feedback (abridged). See our profile for full reviews.
Checkatrade10/10March 2026
“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.…”
Checkatrade9.67/10January 2026
“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…”
Checkatrade10/10June 2025
“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…”
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